EXPLORER INSTITUTIONAL TRUST
485BPOS, 1998-04-30
Previous: ASSOCIATED GROUP INC, DEF 14A, 1998-04-30
Next: AMERICAN BINGO & GAMING CORP, PRE 14A, 1998-04-30



<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 30, 1998
    
 
                                                               FILE NO. 33-84942
                                                                        811-8808
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
 
                                   FORM N-1A
 
   
<TABLE>
            <S>                                                    <C>
            REGISTRATION STATEMENT UNDER
    
   
               THE SECURITIES ACT OF 1933                                [X]
               Post-Effective Amendment No. 2                            [X]
                                          and
    
   
            REGISTRATION STATEMENT UNDER
               THE INVESTMENT COMPANY ACT OF 1940                        [X]
    
   
               Amendment No. 5                                           [X]
</TABLE>
    
 
                                  THE EXPLORER
                              INSTITUTIONAL TRUST
 
      (Exact Name of Registrant as Specified in the Declaration of Trust)
 
              One Parkview Plaza, Oakbrook Terrace, Illinois 60181
                    (Address of Principal Executive Offices)
 
                                 (630) 684-6000
                        (Registrant's Telephone Number)
 
                             Ronald A. Nyberg, Esq.
            Executive Vice President, General Counsel and Secretary
                       Van Kampen American Capital, Inc.
                               One Parkview Plaza
                        Oakbrook Terrace, Illinois 60181
                    (Name and Address of Agent for Service)
 
                                   Copies to:
 
                             Wayne W. Whalen, Esq.
                              Thomas A. Hale, Esq.
                Skadden, Arps, Slate, Meagher & Flom (Illinois)
                             333 West Wacker Drive
                            Chicago, Illinois 60606
   
                                 (312) 407-0700
    
 
     APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING: As soon as practicable
following effectiveness of this Registration Statement.
 
     It is proposed that this filing will become effective: (check appropriate
box)
 
   
          [X] immediately upon filing pursuant to paragraph (b)
    
 
   
          [ ] on (date) pursuant to paragraph (b)
    
 
          [ ] 60 days after filing pursuant to paragraph (a)(1)
 
          [ ] on (date) pursuant to paragraph (a)(1)
 
          [ ] 75 days after filing pursuant to paragraph (a)(2)
 
          [ ] on (date) pursuant to paragraph (a)(2) of Rule 485.
 
     If appropriate check the following:
 
          [ ] this post-effective amendment designates a new effective date for
              a previously filed post-effective amendment.
 
   
     TITLE OF SECURITIES BEING REGISTERED: SHARES OF BENEFICIAL INTEREST, PAR
VALUE $0.01 PER SHARE.
    
 
================================================================================
<PAGE>   2
 
                        THE EXPLORER INSTITUTIONAL TRUST
 
                             CROSS REFERENCE SHEET
 
                 (AS REQUIRED BY ITEM 501(B) OF REGULATION S-K)
 
<TABLE>
<CAPTION>
            ITEM NUMBER OF                                  LOCATION OR CAPTION
              FORM N-1A                                        IN PROSPECTUS
            --------------                                  -------------------
<S>       <C>                           <C>
PART A INFORMATION REQUIRED IN A PROSPECTUS
 
Item 1.   Cover Page..................  Cover Page
 
Item 2.   Synopsis....................  SUMMARY OF FUND EXPENSES
 
Item 3.   Condensed Financial
            Information...............  FINANCIAL HIGHLIGHTS
Item 4.   General Description of
            Registrant................  THE FUNDS' INVESTMENT OBJECTIVES; HOW THE FUNDS SEEK THEIR
                                        INVESTMENT OBJECTIVES; ORGANIZATION
Item 5.   Management of the
            Fund......................  HOW THE FUNDS ARE MANAGED; SHAREHOLDER SERVICES
Item 6.   Capital Stock and Other
            Securities................  ORGANIZATION; DISTRIBUTIONS AND TAXES
Item 7.   Purchase of Securities
            Being Offered.............  HOW TO BUY SHARES; HOW THE FUNDS VALUE THEIR SHARES;
                                        SHAREHOLDER SERVICES
Item 8.   Redemption or
            Repurchase................  HOW TO SELL SHARES; HOW THE FUNDS VALUE THEIR SHARES
Item 9.   Pending Legal
            Proceedings...............  Not Applicable
</TABLE>
 
                                        i
<PAGE>   3
 
<TABLE>
<CAPTION>
                                                            LOCATION OR CAPTION
            ITEM NUMBER OF                                    IN STATEMENT OF
              FORM N-1A                                   ADDITIONAL INFORMATION
            --------------                                ----------------------
<S>       <C>                           <C>
PART B INFORMATION REQUIRED IN A STATEMENT OF ADDITIONAL INFORMATION
Item 10.  Cover Page..................  Cover Page
Item 11.  Table of Contents...........  Table of Contents
Item 12.  General Information
            and History...............  The Funds and the Trust
Item 13.  Investment Objectives
            and Policies..............  Investment Policies and Restrictions; Income Securities;
                                        Investment Practices
Item 14.  Management of the
            Fund......................  Trustees and Officers
Item 15.  Control Persons and
            Principal Holders of
            Securities................  The Funds and the Trust; Trustees and Officers
Item 16.  Investment Advisory and
            Other Services............  Contained in Prospectus under captions: HOW THE FUNDS ARE
                                        MANAGED; Legal Counsel; Investment Advisory and Other
                                        Services; Trustees and Officers; The Distributor; Notes to
                                        Financial Statements
Item 17.  Brokerage Allocation and
            Other Practices...........  Portfolio Transactions and Brokerage Allocation
Item 18.  Capital Stock and
            Other Securities..........  The Funds and the Trust
Item 19.  Purchase, Redemption
            and Pricing of
            Securities Being
            Offered...................  How to Buy Shares; How to Sell Shares, Shareholder
                                        Services; Contained in Prospectus under captions: HOW TO
                                        BUY SHARES; HOW TO SELL SHARES; HOW THE FUNDS VALUE THEIR
                                        SHARES
Item 20.  Tax Status..................  Taxation; How to Buy Shares; Contained in Prospectus under
                                        caption: HOW TO BUY SHARES
Item 21.  Underwriters................  The Distributor; Notes to Financial Statements
Item 22.  Calculations of
            Performance Data..........  Performance Information; Contained in Prospectus under
                                        caption: FUND PERFORMANCE
Item 23.  Financial Statements........  Report of Independent Accountants; Financial Statements;
                                        Notes to Financial Statements; Trustees and Officers
</TABLE>
 
PART C
 
     Information required to be included in Part C is set forth under the
appropriate Item, so numbered, in Part C of this Registration Statement.
 
                                       ii
<PAGE>   4
 
                        EXPLORER
                        INSTITUTIONAL
                        FUNDS(SM)
 
      - Active Core Fund
 
      - Limited Duration Fund
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE REGULATORS NOR HAS THE SECURITIES AND EXCHANGE
COMMISSION OR ANY STATE REGULATORS PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK OR DEPOSITORY INSTITUTION; FURTHER, SUCH SHARES ARE NOT FEDERALLY
INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD
OR ANY OTHER GOVERNMENT AGENCY. SHARES OF THE FUND INVOLVE INVESTMENT RISKS,
INCLUDING POSSIBLE LOSS OF PRINCIPAL.
 
PROSPECTUS
One Parkview Plaza
Oakbrook Terrace, Illinois 60181
 
   
April 30, 1998
    
The Explorer Institutional Trust (the "Trust") is a professionally managed
no-load, open-end management investment company consisting of two separate
investment portfolios ("Funds" or "Explorer Institutional FundsSM"), each with
its own investment objective and policies.
 
The Trust is primarily designed to provide pension and profit sharing plans,
employee benefit trusts, endowments, foundations, other institutions,
corporations and high net worth individuals with access to the professional
investment management services offered by Van Kampen American Capital
Management, Inc. (the "Adviser"), the investment adviser to the Funds. The two
Explorer Institutional FundsSM are the Explorer Institutional Active Core Fund
("Active Core Fund") and the Explorer Institutional Limited Duration Fund
("Limited Duration Fund").
 
In managing the Funds, the Adviser seeks to enhance total return as compared to
an unmanaged portfolio of income securities by identifying value and opportunity
through extensive market, quantitative and credit research, identifying and
taking advantage of market inefficiencies and, within a well defined portfolio
duration range for each respective Fund, adjusting duration from time to time
based on the Adviser's view of market conditions.
 
   
Additional information about the Trust and the Funds is contained in a Statement
of Additional Information dated April 30, 1998, a copy of which has been filed
with the Securities and Exchange Commission ("SEC") and is available along with
other related Trust materials at the SEC's internet web site
(http://www.sec.gov), or may be obtained without charge by calling:
1-800-822-3699.
    
 
This Prospectus, which incorporates by reference the entire Statement of
Additional Information, concisely sets forth certain information about the Trust
and the Funds that a prospective shareholder should know before investing.
Shareholders should read this Prospectus carefully and retain it for future
reference.
<PAGE>   5
 
SUMMARY OF FUND EXPENSES
 
Shareholder Transaction Expenses
 
<TABLE>
<S>                                                           <C>
Maximum sales load imposed on purchases.....................  None
Maximum sales load imposed on reinvested dividends..........  None
Deferred sales load.........................................  None
Redemption fees.............................................  None
Exchange fees...............................................  None
</TABLE>
 
Annual Fund Operating Expenses
(as a percentage of average daily net assets)
 
   
<TABLE>
<CAPTION>
                                                              ACTIVE CORE FUND       LIMITED DURATION FUND
                                                              ----------------       ---------------------
<S>                                                           <C>                    <C>
Management Fees.............................................       0.00%                 0.00%
Other expenses(1)...........................................       0.40%                 0.40%
Total(1)....................................................       0.40%                 0.40%
</TABLE>
    
 
- ---------------
   
(1) The Adviser has agreed to waive fees or reimburse certain expenses of each
    Fund such that the respective Fund's management fees and certain other
    expenses do not exceed 0.40% per annum. See "How the Funds are Managed."
    Other expenses and Total expenses for the period ended December 31, 1997
    each were 2.01% and 1.86% for the Active Core Fund and Limited Duration
    Fund, respectively, before giving effect to such agreement.
    
 
Example
 
A $1,000 investment would have the following transaction costs and operating
expenses assuming a 5% annual return and reinvestment of all dividends and
distributions. This example should not be considered indicative of actual or
expected Fund performance or expenses, both of which will vary.
 
   
<TABLE>
<CAPTION>
                                                              ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
                                                              --------       -----------       ----------       ---------
<S>                                                           <C>            <C>               <C>              <C>
Active Core Fund............................................     $4              $13              $22              $51
Limited Duration Fund.......................................     $4              $13              $22              $51
</TABLE>
    
 
Expenses are one of several factors to consider when you invest in a Fund. The
expense summary format above is used by all mutual funds and is provided here to
help you make your investment decision.
 
                                        2
<PAGE>   6
 
FINANCIAL HIGHLIGHTS (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
The following schedule presents financial highlights for one share of each Fund
outstanding throughout the period indicated. The financial highlights have been
audited by KPMG Peat Marwick LLP, independent certified public accountants, for
the period indicated and their report thereon appears in the Trust's related
Statement of Additional Information. This information should be read in
conjunction with the financial statements and related notes thereto included in
the related Statement of Additional Information.
 
   
<TABLE>
<CAPTION>
                                                            ACTIVE CORE FUND                      LIMITED DURATION FUND
                                                  -------------------------------------   -------------------------------------
                                                                     APRIL 23, 1996                          APRIL 23, 1996
                                                   YEAR ENDED       (COMMENCEMENT OF       YEAR ENDED       (COMMENCEMENT OF
                                                  DECEMBER 31,   INVESTMENT OPERATIONS)   DECEMBER 31,   INVESTMENT OPERATIONS)
                                                      1997        TO DECEMBER 31, 1996        1997        TO DECEMBER 31, 1996
                                                  ------------   ----------------------   ------------   ----------------------
<S>                                               <C>            <C>                      <C>            <C>
Net Asset Value, Beginning of the Period........    $10.085             $10.000             $10.019             $10.000
                                                    -------             -------             -------             -------
  Net Investment Income.........................      0.626                .409               0.574                .386
  Net Realized and Unrealized Gain..............      0.249                .095               0.036                .019
                                                    -------             -------             -------             -------
Total from Investment Operations................      0.875                .504               0.610                .405
                                                    -------             -------             -------             -------
Less:
  Distributions From Net Investment Income......      0.626                .409               0.574                .386
  Distributions From Net Realized Gain..........      0.163                .010               0.018                  --
                                                    -------             -------             -------             -------
Total Distributions.............................      0.789                .419               0.592                .386
                                                    -------             -------             -------             -------
Net Asset Value, End of the Period..............    $10.171             $10.085             $10.037             $10.019
                                                    =======             =======             =======             =======
Total Return*...................................      8.93%               5.20%**             6.29%               4.14%**
Net Assets at End of Period (In millions).......    $   4.9             $   5.6             $   8.2             $   9.8
Ratio of Expenses to Average Net Assets*(a).....      0.60%               0.40%               0.56%               0.40%
Ratio of Net Investment Income to Average Net
  Assets*.......................................      6.19%               5.98%               5.74%               5.68%
Portfolio Turnover..............................       109%                 84%**               41%                 16%**
</TABLE>
    
 
 * If certain expenses had not been reimbursed by the Adviser, total return
   would have been lower and the ratios would have been as follows:
 
   
<TABLE>
<S>                                               <C>            <C>                      <C>            <C>
Ratio of Expenses to Average Net Assets(a)......      2.01%               1.81%               1.86%               1.40%
Ratio of Net Investment Income to Average Net
  Assets........................................      4.78%               4.57%               4.59%               4.68%
</TABLE>
    
 
   
(a) The Ratios of Expenses to Average Net Assets do not reflect credits earned
    on overnight cash balances. If these credits were reflected as a reduction
    of expenses, the ratios would decrease by 0.20% and 0.16% for the year ended
    December 31, 1997 for Active Core Fund and Limited Duration Fund,
    respectively.
    
 
** Non-Annualized
 
                  See Financial Statements and Notes Thereto.
 
                                        3
<PAGE>   7
 
THE FUNDS' INVESTMENT OBJECTIVES
 
  The Trust is primarily designed to provide pension and profit sharing plans,
employee benefit trusts, endowments, foundations, other institutions,
corporations and high net worth individuals with access to the professional
investment management services offered by Van Kampen American Capital
Management, Inc., the investment adviser to the Funds. The Trust currently
consists of two separate Funds, each of which is registered as a diversified,
open-end management investment company. Additional Funds may be added in the
future.
 
  Each Fund has its own investment objective. The investment objective of the
Active Core Fund is to provide an enhanced level of total return as compared to
investment in an unmanaged portfolio consisting primarily of investment grade
intermediate- and long-term income securities of U.S. issuers. The investment
objective of the Limited Duration Fund is to provide an enhanced level of total
return as compared to an investment in an unmanaged portfolio consisting
primarily of investment grade short- and intermediate-term income securities of
U.S. issuers, consistent with preservation of capital. These objectives are
fundamental and cannot be changed without shareholder approval. Total return
includes income together with realized and unrealized capital appreciation or
depreciation. U.S. issuers include the U.S. Government, states and territories
of the United States, agencies, instrumentalities and other political
subdivisions of any of the above and corporations, partnerships, trusts and
other organizations and entities. There are market risks inherent in all
securities investments and there can be no assurance that the Funds will achieve
their objectives.
 
HOW THE FUNDS SEEK THEIR INVESTMENT OBJECTIVES
 
   
  Each Fund will seek to achieve its investment objective by investing
substantially all of its total assets in a professionally managed, diversified
portfolio of income securities. For a discussion of the various types of income
securities in which the Funds may invest, see "Income Securities" below. The
Funds differ primarily in the length of their portfolio duration. For a
discussion of the concept of duration, see "Duration" below. The Funds will not
invest in income securities rated at the time of investment below investment
grade. Investment grade rated securities are securities rated in one of the four
highest rating categories by at least one nationally recognized rating
organization, such as Standard and Poor's Ratings Group ("S&P") or Moody's
Investors Service, Inc. ("Moody's"). For a description of S&P and Moody's
ratings, see the Statement of Additional Information. Each Fund will invest at
least 75% of its assets in securities rated AA/Aa or higher.
    
 
  ACTIVE CORE FUND. The Active Core Fund invests substantially all of its assets
in a diversified portfolio of investment grade income securities having various
maturities and will maintain a portfolio duration of three to six years. The
Fund will invest at least 75% of its assets in securities rated AA/Aa or higher.
The Active Core Fund will not invest in securities rated below BBB/Baa. The Fund
may not invest in securities of foreign issuers.
 
  LIMITED DURATION FUND. The Limited Duration Fund invests substantially all of
its assets in a diversified portfolio of investment grade income securities
having various maturities and will maintain a portfolio duration of one to three
years. The Fund will invest at least 75% of its assets in securities rated AA/Aa
or higher. The Limited Duration Fund will not invest in securities rated below
A. The Fund may not invest in securities of foreign issuers. The total return of
the Limited Duration Fund is expected to exhibit less volatility than that of
the Active Core Fund because its duration will be shorter while its other
investment policies are similar to those of the Active Core Fund.
 
  DURATION. Duration is a measure of the expected life of an income security
that was developed as a more precise alternative to the concept of "term to
maturity." Duration incorporates a security's yield, coupon interest payments,
final maturity and call features into one measure. Duration is an important
criteria used by the Adviser in portfolio selection for the Funds.
 
  Most debt obligations provide interest ("coupon") payments in addition to a
final ("par") payment at maturity. Some obligations also have call provisions.
Depending on the relative magnitude of these payments, the market values of debt
obligations may respond differently to changes in interest rates.
 
                                        4
<PAGE>   8
 
  Traditionally, a debt security's "term to maturity" has been used as a measure
of the sensitivity of the security's price to changes in interest rates (which
is the "interest rate risk" or "volatility" of the security). However, "term to
maturity" measures only the time until a debt security provides its final
payment, taking no account of the pattern of the security's payments prior to
maturity. Duration is a measure of the expected life of an income security on a
present value basis. Duration takes the length of the time intervals between the
present time and the time that the interest and principal payments are scheduled
or, in the case of a callable security, expected to be received, and weights
them by the present values of the cash to be received at each future point in
time. For an income security with interest payments occurring prior to the
payment of principal, duration is less than maturity. In general, all other
things being equal, the lower the stated or coupon rate of interest of a fixed
income security, the longer the duration of the security; conversely, the higher
the stated or coupon rate of interest of a fixed income security, the shorter
the duration of the security.
 
  There are some situations where the standard duration calculation does not
properly reflect the interest rate exposure of a security. For example, floating
and variable rate securities often have final maturities of ten or more years;
however, their interest rate exposure corresponds to the frequency of the coupon
reset. Another example where interest rate exposure is not properly captured by
duration is the case of mortgage pass-through securities. The stated final
maturity of such securities is frequently 30 years, but prepayment rates are
more critical in determining the securities' interest rate exposure. In these
and other similar situations, in determining portfolio duration the Adviser will
use more sophisticated analytical techniques that incorporate the anticipated
economic life of a security into the determination of its interest rate
exposure.
 
  The change in market value of investment grade income securities is largely a
function of changes in the prevailing level of interest rates. When interest
rates are falling, a portfolio with a shorter duration generally will not
generate as high a level of total return as a portfolio with a longer duration.
When interest rates are flat, shorter duration portfolios generally will not
generate as high a level of total return as longer duration portfolios (assuming
that long-term interest rates are higher than short-term rates, which is
commonly the case). When interest rates are rising, a portfolio with a shorter
duration will generally outperform longer duration portfolios. With respect to
the composition of an income portfolio, the longer the duration of the
portfolio, the greater the anticipated potential for total return, with,
however, greater attendant interest rate risk and price volatility than for a
portfolio with a shorter duration.
 
  PORTFOLIO CREDIT QUALITY. Each Fund will invest at least 75% of its assets in
securities rated AA/Aa or higher. A Fund's investments may range in quality from
securities rated in the lowest category in which the Fund is permitted to invest
to securities rated in the highest category.
 
  The Active Core Fund may invest in securities rated in the fourth highest
rating category by a nationally recognized rating organization (e.g., BBB by S&P
or Baa by Moody's). Securities rated BBB are regarded by S&P as having adequate
capacity to pay interest and repay principal. Whereas in S&P's view such
securities normally exhibit adequate protection parameters, adverse economic
conditions or changing circumstances are more likely to lead to a weakened
capacity to pay interest and repay principal for securities in this category
than for securities in higher rated categories. Securities rated Baa are
regarded by Moody's as medium grade obligations (i.e. neither highly protected
nor poorly secured). In Moody's view, interest payments and principal security
for such securities appear adequate for the present but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. In Moody's view, such bonds lack outstanding investment
characteristics and in fact have speculative characteristics as well.
 
  The Limited Duration Fund may invest in securities rated in the third highest
rating category by a nationally recognized rating organization (e.g. A by S&P or
Moody's). Securities rated A by S&P are regarded by S&P as having a strong
capacity to pay interest and repay principal although they are in S&P's view
somewhat more susceptible to the adverse effects of changes in circumstances and
economic conditions than
 
                                        5
<PAGE>   9
 
higher rated securities. Securities rated A by Moody's in Moody's view possess
many favorable investment attributes and are considered by Moody's as upper
medium grade obligations. Factors giving security to principal and interest are
considered by Moody's to be adequate but elements may be present which suggest a
susceptibility to impairment sometime in the future.
 
  The percentage of a Fund's assets invested in securities in a particular
rating category will vary from time to time.
 
   
  INCOME SECURITIES. Each Fund will invest substantially all of its total assets
in U.S. dollar denominated income securities of U.S. issuers. Income securities
include securities issued or guaranteed by the U.S. Government, its agencies or
instrumentalities ("U.S. Government Securities"); mortgage and other asset-
backed securities; corporate debt securities; variable and floating rate debt
securities; commercial paper; certificates of deposit, time deposits and bankers
acceptances; and other instruments having investment characteristics
substantially similar to any of the foregoing and repurchase agreements. The
Funds will not invest in securities of foreign issuers. Prior to investing in
any category of instruments not identified in this Prospectus, the Funds intend
to revise this Prospectus to identify such categories. Certain of the Funds'
investments may be considered derivative instruments. A derivative is a
financial instrument whose performance is derived at least in part from the
performance of an underlying index, security or asset. The values of certain
derivatives can be affected dramatically by even small market movements,
sometimes in ways that are difficult to predict.
    
 
  U.S. Government Securities. U.S. Government Securities are considered among
the most creditworthy of fixed income investments; however, the yields on U.S.
Government securities generally are lower than yields available from most other
types of income securities having comparable duration. U.S. Government
Securities include (1) U.S. Treasury obligations; (2) obligations issued or
guaranteed by U.S. Government agencies and instrumentalities ("Agencies") which
are supported by: (a) the full faith and credit of the U.S. Government; (b) the
right of the issuer or guarantor to borrow an amount from a line of credit with
the U.S. Treasury; (c) discretionary power of the U.S. Government to purchase
obligations of the Agencies or (d) the credit of the Agencies; (3) certain real
estate mortgage investment conduits, certain collateralized mortgage obligations
and other mortgage-backed securities and (4) "when-issued" commitments relating
to the foregoing.
 
  Mortgage-Backed Securities. Mortgage-backed securities are securities that
directly or indirectly represent a participation in, or are secured by and
payable from, mortgage loans secured by real property. The yield characteristics
of mortgage-backed securities differ from traditional debt securities. Interest
and principal payments are made more frequently and principal may be prepaid at
any time because the underlying mortgage loans generally may be prepaid at any
time. Faster or slower prepayments than expected on underlying mortgage loans
can dramatically alter the yield to maturity and duration of a mortgage-backed
security. The value of most mortgage-backed securities, like traditional debt
securities, tends to vary inversely with changes in interest rates; however,
mortgage-backed securities may benefit less than traditional debt securities
from declining interest rates because prepayment of mortgages tend to accelerate
during periods of declining interest rates. When mortgage loans underlying
mortgage-backed securities held by a Fund are prepaid, the Fund reinvests the
prepaid amounts in other income-producing securities, the yields of which will
reflect interest rates prevailing at the time. Therefore, a Fund's ability to
maintain a portfolio of higher-yielding mortgage-backed securities will be
adversely affected to the extent that prepayments must be reinvested in
securities which have lower yields.
 
  Mortgage-backed securities may be structured with various classes of holders
that can receive different proportions of the interest and principal
distributions from the same pool of underlying mortgage assets. The yield to
maturity, duration and market value of such classes may be substantially more
sensitive to the rate of principal payments (including prepayments) on the
related underlying mortgage assets. If the underlying mortgage assets experience
greater than anticipated prepayments of principal, a Fund may fail to fully
recoup its initial investment in certain of these securities
 
                                        6
<PAGE>   10
 
even if held to final maturity. A more complete description of mortgage-backed
securities is contained in the Statement of Additional Information.
 
  Collateralized Mortgage Obligations. CMOs are debt obligations collateralized
by mortgage loans or mortgage pass-through securities and multiclass
pass-through securities, which are equity interests in a trust composed of
mortgage assets. Payments of principal and interest on the mortgage assets, and
any reinvestment income thereon, provide the funds to pay debt service on the
CMOs or make scheduled distributions on the multiclass pass-through securities.
In a CMO, a series of bonds or certificates is issued in multiple classes. Each
class of CMOs, often referred to as a "tranche", is issued at a specific fixed
or floating coupon rate and has a stated maturity or final distribution date.
Principal prepayments on the mortgage assets may cause the CMOs to be retired
substantially earlier than their stated maturities or final distribution dates.
The principal and interest on the mortgage assets may be allocated among the
several classes of a series of a CMO in innumerable ways, some of which bear
substantially more risk than others.
 
  Asset-Backed Securities. The securitization techniques used to develop
mortgage-backed securities are now also applied to a broad range of assets,
primarily automobile and credit card receivables. Other types of asset-backed
securities may be developed in the future. In general, the collateral supporting
asset-backed securities is of shorter maturity than mortgage loans and is less
likely to experience substantial prepayments. Asset-backed securities present
certain risks that are not presented by mortgage-backed securities. Primarily,
these securities do not have the benefit of the same security interest in the
related collateral as do mortgage-backed securities.
 
  Corporate Income Securities. Corporate income securities in which a Fund may
invest include adjustable and fixed rate bonds, debentures and notes and will
generally be unsecured. A Fund may also invest in income securities with
floating or variable rates of interest.
 
  Zero-Coupon Securities. Zero-coupon securities pay no cash interest but are
sold at substantial discounts from their value at maturity. When a zero-coupon
bond is held to maturity, its entire investment return comes from the difference
between its purchase price and its maturity value.
 
  Stripped Treasury Securities. Stripped Treasury securities are obligations
representing an interest in all or a portion of the income or principal
components of an underlying Treasury or pool of Treasury securities. Stripped
Treasury securities include obligations entitled to receive all of the interest
component but none of the principal component (IOs) and obligations entitled to
receive all of the principal component but none of the interest component (POs).
The market values of stripped Treasury securities tend to be more volatile in
response to changes in interest rates than are those of conventional Treasury
securities.
 
  Premium Securities. A Fund may at times invest in securities bearing coupon
rates higher than prevailing market rates. Such "premium" securities are
typically purchased at prices greater than the principal amounts payable on
maturity. If an issuer were to redeem securities held by a Fund during a time of
declining interest rates, the Fund may not be able to reinvest the proceeds in
securities providing the same investment return as the securities redeemed. If
securities purchased by a Fund at a premium are called or sold prior to
maturity, the Fund generally will recognize a capital loss to the extent the
call or sale price is less than the Fund's adjusted tax basis in such
securities. Similarly, the Fund generally will recognize a capital loss in the
event that such securities are held to maturity.
 
                                        7
<PAGE>   11
 
  Adjustable and Floating Rate Securities. Adjustable and floating rate
securities are securities having interest rates which are adjusted or reset at
periodic intervals ranging, in general, from one day to several years, based on
a spread over a specific interest rate or interest rate index or on the results
of periodic auctions. Adjustable and floating rate securities allow a Fund to
participate in all or a portion of increases in interest rates through periodic
upward adjustments of the coupon rates of such securities, resulting in higher
yields. During periods of declining interest rates, however, coupon rates may
readjust downward resulting in lower yields. The Funds will not invest in
"inverse-floaters" (securities whose coupon rates vary inversely with changes in
market rates of interest).
 
  CERTAIN INVESTMENT PRACTICES. In connection with the investment policies
described above, the Funds may also purchase and sell securities on a "when
issued" and "delayed delivery" basis, enter into repurchase agreements and, for
cash management purposes only, enter into reverse repurchase agreements and
borrow money from banks, in each case subject to the limitations set forth
below. Certain of these investment practices involve special risks.
 
  The Funds may purchase and sell securities on a "when issued" and "delayed
delivery" basis. A Fund accrues no income on purchases of such securities until
the Fund actually takes delivery of such securities. These transactions are
subject to market fluctuation; the value of the securities at delivery may be
more or less than their purchase price. The yields generally available on
comparable securities when delivery occurs may be higher than yields on the
securities obtained pursuant to such transactions. Because a Fund relies on the
buyer or seller to consummate the transaction, failure by the other party to
complete the transaction may result in the Fund missing the opportunity of
obtaining a price or yield considered to be advantageous. A Fund will engage in
when issued and delayed delivery transactions for the purpose of acquiring
securities consistent with the Fund's investment objective and policies and not
for the purpose of investment leverage.
 
   
  A Fund may enter into repurchase agreements whereby the Fund purchases
securities and agrees to resell the securities at an agreed upon time and at an
agreed upon price. The difference between the purchase amount and resale amount
is accrued as interest in the Fund's net income. Failure of the seller to
repurchase the securities may cause losses for a Fund. Thus, a Fund must
consider the credit-worthiness of such party. In the event of default by such
party, a Fund may not have a right to the underlying security and there may be
possible delays and expenses in liquidating the security purchased, resulting in
a decline in its value and loss of interest.
    
 
  Each Fund may borrow money from banks for temporary emergency purposes only
(such as meeting share redemption requests), although no Fund expects to do so
in an amount exceeding 5% of its respective total assets (after giving effect to
any such borrowing). Interest expenses and other costs from these transactions
may exceed the interest income and other revenues earned from portfolio assets,
and the net income of the Fund may be less than if these transactions were not
used.
 
   
  A Fund generally will not invest more than 15% of its total assets in
repurchase agreements with a maturity of seven days or more.
    
 
  As a matter of fundamental policy that may not be changed without shareholder
approval, the Funds may not sell any securities "short," write, purchase or sell
puts, calls or combinations thereof, or purchase or sell interest rate or other
financial futures or index contracts or related options for risk management,
hedging or any other purpose.
 
   
  Like other mutual funds, financial and business organizations and individuals
around the world, the Funds could be adversely affected if the computer systems
used by the Funds' Adviser and other service providers do not properly process
and calculate date-related information and data from and after January 1, 2000.
This is commonly known as the "Year 2000 Problem". The Adviser is taking steps
that it believes are reasonably designed to address the Year 2000 Problem with
respect to computer systems that it uses and to obtain reasonable assurances
that comparable steps are being taken by the Funds' other major service
providers. At this time, there can be no
    
 
                                        8
<PAGE>   12
 
   
assurance that these steps will be sufficient to avoid any adverse impact to the
Funds. In addition, the Year 2000 Problem may adversely affect the issuers of
securities in which the Funds may invest which, in turn, may adversely affect
the respective net asset values of the Funds.
    
 
HOW TO BUY SHARES
 
  Shares of each Fund are offered at a price equal to net asset value per share,
without a sales charge. The minimum initial investment is $500,000. The minimum
subsequent investment is $25,000.
 
  The Funds offer their shares to the public on a continuous basis through Van
Kampen American Capital Distributors, Inc. (the "Distributor"), as principal
underwriter, which is located at One Parkview Plaza, Oakbrook Terrace, Illinois
60181. The Distributor receives no compensation for this service. The Adviser
may compensate the Distributor's registered representatives for sales of shares
of the Funds out of its own assets, not out of the assets of the Funds.
 
  Investments may be made either by wire transfer or by mail as follows:
 
  (1) By Wire. Explorer Institutional FundsSM will accept investments by wire.
      An investor must first telephone the Explorer Institutional FundsSM at
      1-800-822-3699 and, in the case of initial investments, provide the
      account registration, address, tax identification number, the Fund in
      which the investment is being made, and the amount being wired. Investors
      will then be assigned an account number and should instruct their bank or
      broker to wire federal funds to ACCESS Investor Services, Inc., Re: the
      Explorer Institutional FundsSM for further credit to Account ________ Name
      __________, Account Number ________. Investors will be responsible for the
      charges, if any, that the bank, broker, dealer or financial intermediary
      may make to handle the wire transfer. A completed Account Application must
      then be forwarded to the Explorer Institutional FundsSM. Subsequent
      investments by wire may be made by instructing a bank or broker to wire
      the specified amount in accordance with the above instructions. Please
      call to advise the Explorer Institutional FundsSM before wiring monies.
 
      Investments made by federal funds wire (up to ten million dollars)
      received prior to 12:00 p.m. Eastern time will be invested at the next
      determined net asset value and begin receiving dividends on that day.
      Investments made by federal funds wire received after 12:00 p.m. Eastern
      time will be invested at the next determined net asset value and begin
      receiving dividends on the next business day.
 
  (2) By Mail. The Explorer Institutional FundsSM will also accept investments
      by mail. Investments by mail may be made by sending a check payable to
      "Explorer Institutional FundsSM" and identifying the Fund in which such
      investment is being made. A completed Account Application, indicating the
      Fund in which the investment is being made, must accompany the check in
      the case of initial investments. Checks and applications should be mailed
      to the transfer agent of the Explorer Institutional FundsSM, ACCESS
      Investor Services, Inc., Explorer Institutional FundsSM, P.O. Box 418256,
      Kansas City, Missouri, 64141-9256 (ACCESS Investor Services, Inc.
      "ACCESS"). ACCESS is a wholly-owned subsidiary of Van Kampen American
      Capital, Inc. Subsequent investments by mail may be made directly to the
      Explorer Institutional FundSM in which such initial investment was made
      accompanied by either the detachable form which is part of the Account
      Statement or by a letter indicating the dollar amount of the investment,
      the account number, and registration. Investments made by check will begin
      receiving dividends on the next business day after the Explorer
      Institutional FundsSM received good funds. For checks drawn on foreign
      banks, monies must be collected before shares will be purchased.
 
  In addition, investors may, subject to the approval of the Trust, purchase
shares of a Fund with liquid securities that are eligible for purchase by the
Fund (consistent with such Fund's investment policies and restrictions) and that
have a value that is readily
 
                                        9
<PAGE>   13
 
ascertainable. These transactions will be effected only if the Adviser intends
to retain the securities in such Fund as an investment. Assets so purchased by a
Fund will be valued in the same manner as they would be valued for purposes of
pricing the Fund's shares if such assets were included in the Fund's assets at
the time of purchase. The Funds reserve the right to amend or terminate this
practice at any time without notice. Investors should consult their own tax
adviser as to the tax consequences of such transactions.
 
   
  OTHER PURCHASE INFORMATION. Purchases of a Fund's shares will be made in full
and fractional shares. In the interest of economy and convenience, certificates
for shares generally will not be issued.
    
 
   
  The Trust reserves the right, in its sole discretion, to suspend the offering
of shares of any Fund or to reject purchase orders when, in the judgment of
management, such suspension or rejection is in the best interests of a Fund; to
waive the minimum investment requirements for certain investors; and to redeem
shares if information provided in the Account Application should prove to be
incorrect in any material respect.
    
 
  Shares of the Trust may not be offered or sold in any state unless registered
or qualified in that jurisdiction or unless an exemption from registration or
qualification is available. The Funds are not registered or qualified for sale
in all jurisdictions. Potential investors should contact the Adviser at One
Parkview Plaza, Oakbrook Terrace, IL 60181 or call the Explorer Institutional
FundsSM at 1-800-822-3699 to determine whether a Fund is registered or qualified
for sale in their particular jurisdiction.
 
  Shares of the Trust may be purchased by customers of broker-dealers or other
financial intermediaries ("service agents") which interact with the Trust on
behalf of their customers. Service agents may impose additional or different
conditions on the purchase or redemption of Trust shares by their customers and
may charge their customers transaction or other account fees on the purchase and
redemption of Trust shares. Each service agent is responsible for transmitting
to its customers a schedule of any such fees and information regarding any
additional or different conditions regarding purchases and redemptions.
Shareholders who are customers of service agents should consult their service
agent for information regarding these fees and conditions.
 
  DIVIDEND REINVESTMENT PROGRAM. Each Fund will automatically credit monthly and
annual distributions to a shareholder's account in additional shares of the
Fund, without a sales charge, unless a shareholder elects another treatment for
such distributions. An election to receive distributions in cash may be made by
calling 1-800-822-3699 or by writing the Explorer Institutional FundsSM at One
Parkview Plaza, Oakbrook Terrace, IL 60181.
 
DISTRIBUTIONS AND TAXES
 
  Each Fund will declare distributions on a daily basis and will pay such
distributions from net investment income on a monthly basis. Each Fund will also
distribute annually any net realized short-term capital gains together with net
realized long-term capital gains, if any.
 
   
  Each Fund has elected and qualified and intends to continue to qualify as a
regulated investment company under the Internal Revenue Code of 1986, as
amended, and to distribute substantially all of its net investment income and
net realized capital gains at least annually. Any distributions in excess of a
Fund's tax-basis, net investment income and capital gains will be a tax-free
return of capital, to the extent of the investor's tax basis in its shares.
Distributions of a Fund's net investment income are taxable to shareholders as
ordinary dividend income whether received in shares or in cash. Distributions of
a Fund's net capital gains ("capital gains dividends") are taxable to
shareholders as long-term capital gains regardless of the length of time the
shares of the Fund have been held by such shareholders. Shareholders not subject
to federal income tax on their income generally will not be required to pay
federal income tax on amounts distributed to them. Interest on certain U.S.
government securities is exempt from state income taxes when received by an
individual and may be exempt when received by a Fund. Each Fund will inform
shareholders annually of the amount and nature of its income and gains and the
percentage of the Fund invested over the year in U.S. government securities.
    
 
                                       10
<PAGE>   14
 
  Redemption or resale of shares of a Fund will be a taxable transaction for
federal income tax purposes. For further information with respect to taxes, see
the Statement of Additional Information.
 
HOW THE FUNDS VALUE THEIR SHARES
 
  The net asset value per share of a Fund is determined by calculating the total
value of the Fund's assets, deducting the total liabilities of the Fund, and
dividing the result by the number of shares of the Fund outstanding. Generally,
net asset value is computed once daily as of 4:00 p.m. Eastern time Monday
through Friday.
 
   
  Portfolio securities are valued by using market quotations, prices provided by
market makers or estimates of market values obtained from yield data relating to
instruments or securities with similar characteristics in accordance with
procedures established from time to time by the Board of Trustees of the Trust.
    
 
HOW TO SELL SHARES
 
  Shareholders may sell shares without charge at any time by mailing a written
redemption request in proper form to the Trust or by calling the Trust at
1-800-822-3699 before 4:00 p.m. Central time to request a redemption.
Shareholders will receive the net asset value next determined after such
shareholder places the sell order. A Fund will not honor a request for
redemption until it has confirmed receipt of good funds with respect to the
purchase of such shares.
 
  Due to the relatively high cost of maintaining small accounts, the Trust
reserves the right to redeem shares in any Fund account for their then-current
value (which will be promptly paid to the investor) if at any time, due to
redemption by the investor, the shares in the account do not have a value of at
least $250,000. A shareholder will receive advance notice of a mandatory
redemption and will be given at least 30 days to bring the value of its account
up to at least $250,000.
 
  Neither the Trust, the Funds, the Distributor nor ACCESS will be liable for
any loss, cost or expense for acting on instructions (whether in writing or by
telephone) believed by the party receiving such instructions to be genuine and
in accordance with the procedures described in this Prospectus. The Funds, the
Trust, the Distributor and ACCESS seek to employ procedures reasonably believed
to confirm that instructions communicated by telephone are genuine. Such
procedures include requiring a person attempting to redeem shares by telephone
to provide, on a recorded line, the name on the account, a social security
number or tax identification number and such additional information as may be
necessary. An investor agrees that no such person will be liable for any loss,
liability, cost or expense arising out of any request, including any fraudulent
or unauthorized request.
 
  The Trust agrees to redeem shares of each Fund solely in cash up to the lesser
of $2,000,000 or 1.00% of the respective Fund's net assets during any 90-day
period for any one shareholder. In consideration of the best interests of the
remaining shareholders of each Fund, the Trust reserves the right to pay any
redemption price exceeding this amount in whole or in part by a distribution in
kind of securities held by the respective Fund in lieu of cash. It is unlikely
that shares will be redeemed in kind. If shares are redeemed in kind, however,
the redeeming shareholder should expect to incur transaction costs upon the
disposition of the securities received in the distribution. For more information
regarding selling shares, please see the Statement of Additional Information.
 
HOW THE FUNDS ARE MANAGED
 
   
  THE ADVISER. Van Kampen American Capital Management, Inc. (the "Adviser") is
the investment adviser for the Funds. The Adviser provides investment advice to
a wide variety of institutional, individual and investment company clients and,
together with its affiliates, had aggregate assets under management or
supervision of more than $60 billion.
    
 
   
  The Adviser is a wholly-owned subsidiary of Van Kampen American Capital, Inc.
("Van Kampen American Capital"). Van Kampen American Capital is an indirect
wholly-owned subsidiary of Morgan Stanley Dean Witter & Co. The Adviser's
principal office is located at One Parkview Plaza, Oakbrook Terrace, Illinois
60181.
    
 
   
  ADVISORY AGREEMENT. The business and affairs of the Funds are managed by the
Adviser under the direction
    
 
                                       11
<PAGE>   15
 
of the Board of Trustees of the Trust. Subject to the Trustees' authority, the
Adviser and the Funds' officers supervise and implement the Funds' investment
activities. The Funds pay the Adviser a fee (accrued daily and paid monthly)
equal to a percentage of their respective average daily net assets as follows:
 
<TABLE>
<CAPTION>
                                       AVERAGE
                                        DAILY         % PER
             FUND                    NET ASSETS       ANNUM
             ----                    ----------       -----
<S>                              <C>                  <C>
Active Core Fund...............  Up to one billion
                                 dollars............  0.30%
                                 Thereafter.........  0.25%
Limited Duration Fund..........  Up to one billion
                                 dollars............  0.30%
                                 Thereafter.........  0.25%
</TABLE>
 
   
  Under each Fund's investment advisory agreement with the Adviser, subject to
the expense limitations discussed below, each Fund has agreed to assume and pay
the charges and expenses of its operations, including the compensation of the
trustees of the Trust (other than those who are interested persons of the
Adviser and other than those who are interested persons of the Distributor but
not of the Adviser, if the Distributor has agreed to pay such compensation), the
charges and expenses of independent accountants, legal counsel, any transfer or
dividend disbursing agent and the custodian (including fees for safekeeping of
securities), costs of calculating net asset value, costs of acquiring and
disposing of portfolio securities, interest (if any) on obligations incurred by
the Fund, costs of share certificates, membership dues in the Investment Company
Institute or any similar organization, costs of trustee and officer errors and
omissions insurance, reports and notices to shareholders, costs of registering
shares of the Fund under the federal securities laws, miscellaneous expenses and
all taxes and fees to federal, state or other governmental agencies.
    
 
  EXPENSE LIMITATION. In the interest of limiting the expenses of the Funds, the
Adviser has agreed to waive fees or reimburse certain expenses such that the
expenses of each Fund, including the advisory fees (but excluding interest,
taxes, brokerage commissions and other portfolio transaction expenses, other
expenditures which are capitalized in accordance with generally accepted
accounting principles and any extraordinary costs and expenses) will not exceed
the following amounts (expressed as a percentage of average net assets on an
annual basis).
 
<TABLE>
<S>                                            <C>
Active Core Fund...........................    0.40%
Limited Duration Fund......................    0.40%
</TABLE>
 
  Fees foregone or payments made by the Adviser with respect to a Fund pursuant
to the expense limitation are contingent liabilities of such Fund which are
subject to potential reimbursement by that Fund to the Adviser, provided the
Fund's assets reach a sufficient size to permit such reimbursement to be made
without causing the annual expense ratio of the Fund to exceed the applicable
limitation set forth above, or such lower amount as may be imposed by any state
expense limitation to which the Fund is subject, and provided such reimbursement
is made within four years of the recognition of the contingent liability by the
Fund. If a reimbursement appears probable, it will be accounted for as an
expense of the Fund regardless of the time period over which the reimbursement
may actually be paid by the Fund.
 
HOW THE FUNDS EXECUTE PORTFOLIO TRANSACTIONS
 
   
  The Adviser is responsible for decisions to buy and sell securities for the
Funds, the selection of brokers and dealers to effect the transactions and the
negotiation of prices and any brokerage commissions. Many securities in which
the Funds invest are traded principally in the over-the-counter market.
Over-the-counter securities generally are traded on a net basis with dealers
acting as principal for their own accounts without a stated commission, although
the price of the security usually includes a mark-up to the dealer. Securities
purchased in underwritten offerings generally include, in the price, a fixed
amount of compensation for the financial advisers, underwriters and dealers. The
Funds also may purchase certain money market instruments directly from an
issuer, in which case no commissions or discounts are paid. Purchases and sales
    
 
                                       12
<PAGE>   16
 
of securities on a stock exchange are effected through brokers who charge a
commission for their services. Day to day management of the portfolios of each
Fund is the responsibility of a team of officers of the Adviser.
 
  The Adviser's primary considerations in selecting the manner of executing
securities transactions for the Funds will be prompt execution of orders, the
size and breadth of the market for the security, the reliability, integrity and
financial condition and execution capability of the firm, the size of and
difficulty in executing the order, and the best net price. There are many
instances when, in the judgment of the Adviser, more than one firm can offer
comparable execution services. In selecting among such firms, consideration is
given to those firms which supply research and other services in addition to
execution services. See "Portfolio Transactions and Brokerage Allocation" in the
Statement of Additional Information for more information.
 
  In effecting purchases and sales of the Funds' portfolio securities, the
Adviser and the Funds may place orders with and pay brokerage commissions to
brokers which may be affiliated with the Funds, the Adviser or the Distributor.
 
  The Funds and the Adviser have adopted Codes of Ethics designed to recognize
the fiduciary relationship between each Fund and the Adviser and its employees.
The Codes permit directors, trustees, officers and employees to buy and sell
securities for their personal accounts subject to certain restrictions. Persons
with access to certain sensitive information are subject to pre-clearance and
other procedures designed to prevent conflicts of interest.
 
SHAREHOLDER SERVICES
 
   
  Shareholders of the Funds automatically are enrolled in or may elect to
participate in certain shareholder programs available to shareholders of the
Explorer Institutional FundsSM. These programs include Dividend Reinvestment
Programs and Exchange Programs. For more information regarding these shareholder
services and programs, please see the Statement of Additional Information.
Shareholder inquiries should be directed to the Funds c/o the Explorer
Institutional FundsSM, One Parkview Plaza, Oakbrook Terrace, Illinois 60181 or
by calling 1-800-822-3699.
    
 
  ACCESS Investor Services, Inc., P.O. Box 418256, Kansas City, MO 64141-9256,
an affiliated transfer agent for the Funds, performs bookkeeping, data
processing and administrative services related to the maintenance of shareholder
accounts.
 
FUND PERFORMANCE
 
  From time to time advertisements and other sales materials for the Funds may
include information concerning the historical performance of the Funds. Any such
information will include the average total return calculated on a compounded
basis for specified periods of time. Such advertisements and sales material may
also include a yield quotation as of a current period. In each case, such total
return and yield information, if any, will be calculated pursuant to rules
established by the SEC. In addition, the Funds may include in advertisements or
other sales literature information regarding the past performance of certain
types of investments or market indices. In lieu of or in addition to total
return and yield calculations, such information may include performance rankings
and similar information from independent organizations such as Lipper Analytical
Services, Inc., Morningstar, Business Week, Forbes or other industry
publications. From time to time, a Fund may compare its performance to certain
securities and unmanaged indices which may have different risk/reward
characteristics than the Fund. Such characteristics may include, but are not
limited to, tax features, guarantees, insurance and the fluctuation of principal
and/or return. In addition, from time to time, the Funds may utilize sales
literature that includes hypotheticals.
 
  From time to time, the Funds may include in sales literature and shareholder
reports a quotation of the current "distribution rate." Distribution rate is a
measure of the level of income distributed for a specified period. Distribution
rate is determined by annualizing the distributions per share for a stated
period and dividing the result by the public offering price for the same period.
It differs from yield, which is a measure of the income actually earned by a
Fund's investments, and from total return, which is a measure of the income
 
                                       13
<PAGE>   17
 
actually earned by, plus the effect of any realized and unrealized appreciation
or depreciation of, such investments during a stated period. Distribution rate
is, therefore, not intended to be a complete measure of a Fund's performance.
Distribution rate may sometimes be greater than yield since, for instance, it
may not include the effect of amortization of bond premiums and premiums from
futures transactions engaged in by a Fund.
 
  Please consult the Statement of Additional Information for more information
regarding Fund performance.
 
ORGANIZATION
 
  Each Fund is a series of The Explorer Institutional Trust, a Massachusetts
business trust organized on September 30, 1994 (the "Trust"). To date, the Funds
are the only series of the Trust, although the trustees of the Trust are
empowered to designate other series. Shares of the Trust entitle their holders
to one vote per share; however, separate votes are taken by each series on
matters affecting an individual series. The Trust does not contemplate holding
regular meetings of shareholders to elect trustees or otherwise. However, the
holders of 10% or more of the outstanding shares may by written request require
a meeting to consider the removal of trustees by vote of shareholders holding
not less than two thirds of the shares then outstanding. The Trust will assist
such holders in communicating with other shareholders of the Trust to the extent
required by applicable law. The Declaration of Trust provides that shareholders
are not liable for any liabilities of the Trust or any series, requires
inclusion of a clause to that effect in every agreement entered into by the
Trust or any of its series and indemnifies shareholders against any such
liability.
 
  The authorized capitalization of each Fund consists of an unlimited number of
shares of beneficial interest, without par value.
 
  The fiscal year end of each Fund is December 31.
 
  More detailed information concerning the Trust is set forth in the Statement
of Additional Information.
 
ADDITIONAL INFORMATION
 
  This Prospectus and the Statement of Additional Information do not contain all
the information set forth in the Registration Statement filed by the Trust with
the SEC under the Securities Act of 1933. Copies of the Registration Statement
may be obtained at a reasonable charge from the SEC, examined, without charge,
at the office of the SEC in Washington, D.C. or located on the SEC's internet
web site (http://www.sec.gov).
 
                                       14
<PAGE>   18
 
EXISTING SHAREHOLDERS--
FOR INFORMATION ON YOUR
EXISTING ACCOUNT PLEASE CALL
THE TRUST'S TOLL-FREE
NUMBER--1-800-822-3699.

PROSPECTIVE INVESTORS--CALL
1-800-822-3699.
 
EXPLORER
INSTITUTIONAL FUNDSSM
One Parkview Plaza
Oakbrook Terrace, Illinois 60181

Investment Adviser
VAN KAMPEN AMERICAN CAPITAL
MANAGEMENT, INC.
One Parkview Plaza
Oakbrook Terrace, Illinois 60181

Distributor
VAN KAMPEN AMERICAN CAPITAL
DISTRIBUTORS, INC.
One Parkview Plaza
Oakbrook Terrace, Illinois 60181

Transfer Agent
ACCESS INVESTOR SERVICES, INC.
Explorer Institutional FundsSM
P.O. Box 418256
Kansas City, MO 64141-9256

Custodian
STATE STREET BANK AND
TRUST COMPANY
225 Franklin Street, P.O. Box 1713
Boston, MA 02105-1713
Attn: Explorer Institutional FundsSM

Legal Counsel
   
    
SKADDEN, ARPS, SLATE,
MEAGHER & FLOM (ILLINOIS)
333 West Wacker Drive
Chicago, IL 60606

Independent Accountants
KPMG PEAT MARWICK LLP
303 East Wacker Drive
Chicago, IL 60601
<PAGE>   19
 
NO DEALER, SALESMAN OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS, OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS, IN CONNECTION WITH THE OFFER CONTAINED IN THIS PROSPECTUS AND, IF
GIVEN OR MADE, SUCH OTHER INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON
AS HAVING BEEN AUTHORIZED BY ANY FUND, THE TRUST, THE ADVISER, OR THE
DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER BY ANY FUND, THE
TRUST, THE ADVISER OR THE DISTRIBUTOR TO SELL OR A SOLICITATION OF AN OFFER TO
BUY ANY OF THE SECURITIES OFFERED HEREBY IN ANY JURISDICTION TO ANY PERSON TO
WHOM IT IS UNLAWFUL FOR SUCH PERSON TO MAKE SUCH AN OFFER IN SUCH JURISDICTION.
 
                               ------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                              PAGE
                                              ----
<S>                                           <C>
Summary of Fund Expenses....................    2
Financial Highlights........................    3
The Funds' Investment Objectives............    4
How the Funds Seek Their Investment
  Objectives................................    4
How to Buy Shares...........................    9
Distributions and Taxes.....................   10
How the Funds Value Their Shares............   11
How to Sell Shares..........................   11
How the Funds Are Managed...................   11
How the Funds Execute Portfolio
  Transactions..............................   12
Shareholder Services........................   13
Fund Performance............................   13
Organization................................   14
Additional Information......................   14
</TABLE>
    
 
 (SM) Service Mark of Van Kampen American Capital Distributors, Inc.
- ---------------------------------------
 
EXPLORER
INSTITUTIONAL FUNDS(SM)
 
- - Active Core Fund
 
- - Limited Duration Fund
 
- ---------------------------------------
 
(Prospectus)
 
   
APRIL 30, 1998
    
 
<PAGE>   20
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
                        EXPLORER INSTITUTIONAL FUNDS(SM)
 
  The Explorer Institutional Trust (the "Trust") is a professionally managed
no-load, open-end management investment company consisting of two separate
investment portfolios ("Funds" or "Explorer Institutional Funds(SM)"), each with
its own investment objectives and policies. The Trust is primarily designed to
provide pension and profit sharing plans, employee benefit trusts, endowments,
foundations, other institutions, corporations and high net worth individuals
with access to the professional investment management services offered by Van
Kampen American Capital Management, Inc. (the "Adviser"), the investment adviser
to the Funds. The net asset value and the return of the Funds will fluctuate
depending on market conditions and other factors.
 
   
  This Statement of Additional Information is not a prospectus but should be
read in conjunction with the Prospectus for the Explorer Institutional Funds(SM)
dated April 30, 1998 (the "Prospectus"). A copy of the Prospectus may be
obtained without charge by calling the Trust's toll-free number: 1-800-822-3699.
    
 
   
  The Prospectus and this Statement of Additional Information omit certain of
the information contained in the registration statement filed with the
Securities and Exchange Commission, Washington, D.C. (the "SEC"). These items
may be obtained from the SEC upon payment of the fee prescribed, inspected at
the SEC's office at no charge or located on the SEC's internet web site
(http://www.sec.gov). Capitalized terms used but not defined herein shall have
the meanings set forth in the Prospectus.
    
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<S>                                                           <C>
The Funds and the Trust.....................................  B-2
Investment Policies and Restrictions........................  B-3
Income Securities...........................................  B-4
Investment Practices........................................  B-9
Description of Securities Ratings...........................  B-9
Trustees and Officers.......................................  B-13
Investment Advisory and Other Services......................  B-24
Portfolio Transactions and Brokerage Allocation.............  B-27
Taxation....................................................  B-28
The Distributor.............................................  B-31
Legal Counsel...............................................  B-31
Performance Information.....................................  B-31
How to Buy Shares...........................................  B-33
How to Sell Shares..........................................  B-34
Shareholder Services........................................  B-36
Instructions Regarding Backup Withholding...................  B-36
Report of Independent Accountants...........................  B-38
Financial Statements -- Explorer Institutional Active Core
  Fund......................................................  B-39
Financial Statements -- Explorer Institutional Limited
  Duration Fund.............................................  B-45
Notes to Financial Statements...............................  B-51
Account Applications........................................  B-54
</TABLE>
    
 
   
        THIS STATEMENT OF ADDITIONAL INFORMATION IS DATED APRIL 30, 1998
    
<PAGE>   21
 
                            THE FUNDS AND THE TRUST
 
  The Trust is a professionally managed no-load, open-end management investment
company. Each of the Explorer Institutional FundsSM is a separate, diversified
series of the Trust. The Trust is an unincorporated business trust established
under the laws of the State of Massachusetts by an Agreement and Declaration of
Trust dated September 30, 1994 and amended on November 14, 1995. The Declaration
of Trust permits the Trustees to issue an unlimited number of full and
fractional shares, without par value, in separate series. To date, the Explorer
Institutional Active Core Fund (the "Active Core Fund"), formerly known as the
Explorer Institutional Enhanced Benchmark Fund, and Explorer Institutional
Limited Duration Fund (the "Enhanced Limited Duration Fund"), formerly known as
the Explorer Institutional Enhanced Limited Duration Fund, (collectively,
"Explorer Institutional FundsSM" or the "Funds"), which were each established
pursuant to a Designation of Series on September 30, 1994, are the only series
of the Trust, although the Trustees are empowered by the Declaration of Trust to
designate additional series and issue shares thereof.
 
  Shares of each series represent an equal proportionate interest in the assets
of the series with each other share in such series and no interest in any other
series. No series is subject to the liabilities of any other series. The
Declaration of Trust provides that shareholders are not liable for any
liabilities of the Trust or any of its series, requires inclusion of a clause to
that effect in every agreement entered into by the Trust or any of its series
and indemnifies shareholders against any such liability.
 
  Shares of the Trust entitle their holders to one vote per share; however,
separate votes are taken by each series on matters affecting an individual
series. For example, a change in investment policy for a series would be voted
upon by shareholders of only the series involved. Shares do not have cumulative
voting rights, preemptive rights or any conversion or exchange rights other than
those described in the Prospectus or this Statement of Additional Information.
The Trust does not contemplate holding regular meetings of shareholders to elect
Trustees or otherwise. However, the holders of 10% or more of the outstanding
shares may by written request require a meeting to consider the removal of
Trustees by a vote of a majority of the shares present and voting at such
meeting.
 
  The Trustees may amend the Declaration of Trust (including with respect to any
series) in any manner without shareholder approval, except that the Trustees may
not adopt any amendment adversely affecting the rights of shareholders of any
series without approval by a majority vote of the shares of each affected series
present at a meeting of shareholders of such series (or such higher vote as may
be required by the Investment Company Act of 1940, as amended (the "1940 Act"),
or other applicable law) and except that the Trustees cannot amend the
Declaration of Trust to impose any liability on shareholders, make any
assessment on shares or impose liabilities on the Trustees without approval from
each affected shareholder or Trustee, as the case may be.
 
  Statements contained in this Statement of Additional Information as to the
contents of any contract or other document referred to are not necessarily
complete, and, in each instance, reference is made to the copy of such contract
or other document filed as an exhibit to the Registration Statement of which
this Statement of Additional Information forms a part, each such statement being
qualified in all respects by such reference.
 
                                       B-2
<PAGE>   22
 
                      INVESTMENT POLICIES AND RESTRICTIONS
 
  Each Fund has its own investment objective, policies and restrictions. The
investment objective of the Active Core Fund is to provide an enhanced level of
total return as compared to investment in an unmanaged portfolio consisting
primarily of investment grade medium- and long-term U.S. income securities. The
investment objective of the Limited Duration Fund is to provide an enhanced
level of total return as compared to an investment in an unmanaged portfolio
consisting primarily of investment grade short- and intermediate-term U.S.
income securities, consistent with preservation of capital. These objectives are
fundamental and cannot be changed without shareholder approval. There are market
risks inherent in all securities investments and there can be no assurance that
the Funds will achieve their respective objectives.
 
  Each of the Funds will seek to achieve its investment objective by investing
substantially all of its total assets in a professionally managed, diversified
portfolio of income securities. The Funds may also make other investments
described in the Prospectus. Each Fund may also make any investment not
inconsistent with the following investment restrictions in connection with a
work-out or restructuring of a security held in such Fund's portfolio if such
investment is believed by the Adviser to be in the best interest of the Fund.
The net asset value and return of the Funds may vary.
 
  Fundamental investment restrictions limiting the investments of the Funds
provide that each Fund may not:
 
          1. With respect to 75% of its total assets, purchase any securities
     (other than obligations guaranteed by the United States Government or by
     its agencies or instrumentalities), if, as a result, more than 5% of the
     Fund's total assets (determined at the time of investment) would then be
     invested in securities of a single issuer or, if, as a result, the Fund
     would hold more than 10% of the outstanding voting securities of an issuer.
 
          2. Invest 25% or more of the value of its total assets in any single
     industry. (Neither the U.S. government nor any of its agencies or
     instrumentalities will be considered an industry for purposes of this
     restriction.)
 
          3. Borrow money, except from banks for temporary purposes and then in
     amounts not in excess of 5% of the total asset value of the Fund, or
     mortgage, pledge, or hypothecate any assets except in connection with a
     borrowing and in amounts not in excess of 5% of the total asset value of
     the Fund. Borrowings may not be made for investment leverage, but only to
     enable the Fund to satisfy redemption requests where liquidation of
     portfolio securities is considered disadvantageous or inconvenient. In this
     connection, the Fund will not purchase portfolio securities during any
     period that such borrowings exceed 5% of the total asset value of the Fund.
     Notwithstanding this investment restriction, the Fund may enter into when
     issued and delayed delivery transactions as described in the Prospectus.
 
          4. Make loans of money or property to any person, except to the extent
     the securities in which the Fund may invest are considered to be loans.
 
          5. Buy any securities "on margin." Neither the deposit of initial or
     maintenance margin in connection with risk management and hedging
     transactions nor short term credits as may be necessary for the clearance
     of transactions is considered the purchase of a security on margin.
 
                                       B-3
<PAGE>   23
 
          6. Sell any securities "short," write, purchase or sell puts, calls or
     combinations thereof, or purchase or sell interest rate or other financial
     futures or index contracts or related options.
 
          7. Act as an underwriter of securities, except to the extent the Fund
     may be deemed to be an underwriter in connection with the sale of
     securities held in its portfolio.
 
          8. Make investments for the purpose of exercising control or
     participation in management, except to the extent that exercise by the Fund
     of its rights under agreements related to portfolio securities would be
     deemed to constitute such control or participation.
 
          9. Invest in securities of other investment companies, except as part
     of a merger, consolidation or other acquisition and except as permitted
     under the 1940 Act.
 
          10. Invest in oil, gas or mineral leases or in equity interests in
     oil, gas, or other mineral exploration or development programs except
     pursuant to the exercise by the Fund of its rights under agreements
     relating to portfolio securities.
 
          11. Purchase or sell real estate (including real estate limited
     partnership interests), commodities or commodity contracts, except to the
     extent that the securities that the Fund may invest in are considered to be
     interests in real estate, commodities or commodity contracts or to the
     extent the Fund exercises its rights under agreements relating to portfolio
     securities (in which case the Fund may liquidate real estate acquired as a
     result of a default on a mortgage), and except to the extent that risk
     management and hedging transactions the Fund may engage in are considered
     to be commodities or commodities contracts.
 
  No Fund may change any of these investment restrictions as they apply to such
Fund without the approval of the lesser of (i) more than 50% of the Fund's
outstanding shares or (ii) 67% of the Fund's outstanding shares present at a
meeting at which the holders of more than 50% of the outstanding shares are
present in person or by proxy. As long as the percentage restrictions described
above are satisfied at the time of the investment or borrowing, a Fund will be
considered to have abided by those restrictions even if, at a later time, a
change in values or net assets causes an increase or decrease in percentage
beyond that allowed.
 
   
  Frequency of portfolio turnover will not be a limiting factor if a Fund
considers it advantageous to purchase or sell securities. Each Fund anticipates
that its annual portfolio turnover rate will normally be less than 100%.
Portfolio turnover will be calculated by dividing the lesser of purchases or
sales of portfolio securities by the monthly average value of the securities in
the portfolio during the year. Securities, including options, whose maturity or
expiration date at the time of acquisition were one year or less will be
excluded from such calculation.
    
 
                               INCOME SECURITIES
 
  Income securities include securities issued or guaranteed by the U.S.
Government, its agencies or instrumentalities ("U.S. Government Securities");
mortgage and other asset-backed securities; corporate debt securities; variable
and floating rate debt securities; commercial paper; certificates of deposit,
time deposits and bankers acceptances; other instruments having investment
characteristics substantially similar to any of the foregoing and repurchase
agreements and reverse repurchase agreements with respect to any of the
foregoing. Corporate income securities in which a Fund may invest include
 
                                       B-4
<PAGE>   24
 
adjustable and fixed rate bonds, debentures and notes and will generally be
unsecured. A Fund may also invest in debt securities with floating or variable
rates of interest.
 
  U.S. Treasury Securities.  U.S. Treasury securities include bills, notes and
bonds issued by the U.S. Treasury. These instruments are direct obligations of
the U.S. Government and, as such, are backed by the full faith and credit of the
United States. They differ primarily in their interest rates, the lengths of
their maturities and the dates of their issuances.
 
  Stripped Treasury Securities. Stripped Treasury securities are obligations
representing an interest in all or a portion of the income or principal
components of an underlying Treasury or pool of Treasury securities. Stripped
Treasury securities include obligations entitled to receive all of the interest
component but none of the principal component (IOs) and obligations entitled to
receive all of the principal component but none of the interest component (POs).
The market values of stripped Treasury securities tend to be more volatile in
response to changes in interest rates than are those of conventional Treasury
securities.
 
  Obligations Issued or Guaranteed by U.S. Government Agencies and
Instrumentalities.  Obligations issued by agencies of the U.S. Government or
instrumentalities established or sponsored by the U.S. Government include those
that are guaranteed by federal agencies or instrumentalities and may or may not
be backed by the full faith and credit of the United States. Obligations of the
Government National Mortgage Association ("GNMA"), the Farmers Home
Administration and the Export-Import Bank are backed by the full faith and
credit of the United States. U.S. Government Securities that are not backed by
the full faith and credit of the United States include, among others,
obligations issued by the Tennessee Valley Authority, the Resolution Trust
Corporation, the Federal National Mortgage Association ("FNMA"), the Federal
Home Loan Mortgage Corporation ("FHLMC") and the United States Postal Service,
each of which has the right to borrow from the United States Treasury to meet
its obligations, and obligations of the Federal Farm Credit Bank and the Federal
Home Loan Bank, the obligations of which may be satisfied only by the individual
credit of the issuing agency. Investments in FHLMC, FNMA and other obligations
may include collateralized mortgage obligations and real estate mortgage
investment conduits issued or guaranteed by such entities. In the case of
securities not backed by the full faith and credit of the United States, a Fund
must look principally to the agency issuing or guaranteeing the obligation for
ultimate repayment and may not be able to assert a claim against the U.S. if the
agency or instrumentality does not meet its commitments.
 
   
  Mortgage-Backed Securities Issued or Guaranteed by U.S. Government
Instrumentalities.  Mortgage-backed securities may be issued or guaranteed by
U.S. Government agencies such as GNMA, FNMA or FHLMC and represent undivided
ownership interests in pools of mortgages. The mortgages backing these
securities may include conventional 30-year fixed rate mortgages, 15-year fixed
rate mortgages adjustable rate mortgages. The U.S. Government or the issuing
agency guarantees the payment of the interest on and principal of these
securities. However, the guarantees do not extend to the securities' yield or
value, which are likely to vary inversely with fluctuations in interest rates,
nor do the guarantees extend to the yield or value of a Fund's shares. These
securities are in most cases "pass-through" instruments, through which the
holders receive a share of all interest and principal payments from the
mortgages underlying the securities, net of certain fees. Because the principal
amounts of such underlying mortgages may generally be prepaid in whole or in
part by the mortgagees at any time without penalty and the prepayment
characteristics of the underlying mortgages vary, it is not possible to predict
accurately the average life of a particular issue of pass-through securities.
Mortgage-backed securities are subject to more rapid repayment than their stated
maturity date would indicate as a result
    
 
                                       B-5
<PAGE>   25
 
   
of the pass-through of prepayments of principal on the underlying mortgage
obligations. The remaining maturity of a mortgage-backed security will be deemed
to be equal to the average maturity of the mortgages underlying such security
determined by the Adviser on the basis of assumed prepayment rates with respect
to such mortgages. The remaining expected average life of a pool of mortgages
underlying a mortgage-backed security is a prediction of when the mortgages will
be repaid and is based upon a variety of factors such as the demographic and
geographic characteristics of the borrowers and the mortgaged properties, the
length of time that each of the mortgages has been outstanding, the interest
rates payable on the mortgages and the current interest rate environment. During
periods of declining interest rates, prepayment of mortgages underlying
mortgage-backed securities can be expected to accelerate. When the mortgage
obligations are prepaid, a Fund reinvests the prepaid amounts in other income
producing securities, the yields of which reflect interest rates prevailing at
the time. Therefore, a Fund's ability to maintain a portfolio of high-yielding
mortgage- backed securities will be adversely affected to the extent that
prepayments of mortgages must be reinvested in securities which have lower
yields than the prepaid mortgage-backed securities. Moreover, prepayments of
mortgages which underlie securities purchased by a Fund at a premium would
result in capital losses.
    
 
  Collateralized Mortgage Obligations and Multiclass Pass-Through
Securities.  Collateralized mortgage obligations ("CMOs") are debt obligations
collateralized by mortgage loans or mortgage pass-through securities. Typically,
CMOs are collateralized by GNMA, FNMA and FHLMC certificates, but also may be
collateralized by whole loans or private pass-through securities (such
collateral collectively hereinafter referred to as "Mortgage Assets").
Multiclass pass-through securities are equity interests in a trust composed of
Mortgage Assets. Unless the context indicates otherwise, all references herein
to CMOs include multiclass pass-through securities. Payments of principal of and
interest on the Mortgage Assets, and any reinvestment income thereon, provide
the funds to pay debt service on the CMOs or make scheduled distributions on the
multiclass pass-through securities. CMOs deemed to be U.S. government securities
are those issued or guaranteed as to principal and interest by a person
controlled or supervised by and acting as an agency or instrumentality of the
U.S. government. The issuer of a series of CMOs may elect to be treated as a
Real Estate Mortgage Investment Conduit (a "REMIC").
 
  In a CMO, a series of bonds or certificates is issued in multiple classes.
Each class of CMOs, often referred to as a "tranche", is issued at a specific
fixed or floating coupon rate and has a stated maturity or final distribution
date. Principal prepayments on the Mortgage Assets may cause the CMOs to be
retired substantially earlier than their stated maturities or final distribution
dates. Interest typically is paid or accrues on a monthly, quarterly or
semi-annual basis. The principal and interest on the Mortgage Assets may be
allocated among the several classes of a series of a CMO in innumerable ways. In
one structure, payments of principal, including any principal prepayments, on
the Mortgage Assets are applied to the classes of a CMO in the order of their
respective stated maturities or final distribution dates, so that no payment of
principal will be made on any class of CMOs until all other classes having an
earlier stated maturity or final distribution date have been paid in full.
 
  Parallel pay CMOs are structured to provide payments of principal on each
payment date to more than one class. These simultaneous payments are taken into
account in calculating the stated maturity date or final distribution date of
each class, which, as with other CMO structures, must be retired by its stated
maturity date or final distribution date but may be retired earlier. Planned
Amortization Class CMOs ("PAC Bonds") generally require payments of a specified
amount of principal on each payment
 
                                       B-6
<PAGE>   26
 
date. PAC Bonds are always parallel pay CMOs with the required principal payment
on such securities having the highest priority after interest has been paid to
all classes.
 
  Types of Credit Support. Mortgage-backed securities are often backed by a pool
of assets representing the obligations of a number of different parties. To
lessen the effect of failures by obligors on underlying assets to make payments,
such securities may contain elements of credit support. Such credit support
falls into two categories: (i) liquidity protection and (ii) protection against
losses resulting from ultimate default by an obligor on the underlying assets.
Liquidity protection refers to the provision of advances, generally by the
entity administering the pool of assets, to ensure that the receipt of payments
on the underlying pool occurs in a timely fashion. Protection against losses
resulting from ultimate default ensures ultimate payment of the obligations on
at least a portion of the assets in the pool. Such protection may be provided
through guarantees, insurance policies or letters of credit obtained by the
issuer or sponsor from third parties, through various means of structuring the
transaction or through a combination of such approaches.
 
  Examples of credit support arising out of the structure of the transaction
include "senior-subordinated securities" (multiple class securities with one or
more classes subordinate to other classes as to the payment of principal thereof
and interest thereon, with the result that defaults on the underlying assets are
borne first by the holders of the subordinated class), creation of "reserve
funds" (where cash or investments, sometimes funded from a portion of the
payments on the underlying assets, are held in reserve against future losses)
and "overcollateralization" (where the scheduled payments on, or the principal
amount of, the underlying assets exceeds that required to make payment of the
securities and pay any servicing or other fees). The degree of credit support
provided for each issue is generally based on historical information respecting
the level of credit risk associated with the underlying assets. Delinquencies or
losses in excess of those anticipated could adversely affect the return on an
investment in such issue.
 
  Asset-Backed Securities.  The securitization techniques used to develop
mortgage-backed securities are now also applied to a broad range of assets.
Through the use of trusts and special purpose corporations, various types of
assets, primarily automobile and credit card receivables, are being securitized
in pass-through structures similar to the mortgage pass-through structures
described above or in a pay-through structure similar to the CMO structure.
Other types of asset-backed securities may be developed in the future.
 
  In general, the collateral supporting asset-backed securities is of shorter
maturity than mortgage loans and is less likely to experience substantial
prepayments. As with mortgage-backed securities, asset-backed securities are
often backed by a pool of assets representing the obligations of a number of
different parties and use similar credit enhancement techniques. Asset-backed
securities present certain risks that are not presented by mortgage-backed
securities. Primarily, these securities do not have the benefit of the same
security interest in the related collateral. Credit card receivables are
generally unsecured and the debtors are entitled to the protection of a number
of state and federal consumer credit laws, many of which give such debtors the
right to set off certain amounts owed on the credit cards, thereby reducing the
balance due. Most issuers of asset-backed securities backed by automobile
receivables permit the servicers of such receivables to retain possession of the
underlying obligations. If the servicer were to sell these obligations to
another party, there is a risk that the purchaser would acquire an interest
superior to that of the holders of the related asset-backed securities. In
addition, because of the large number of vehicles involved in a typical issuance
and technical requirements under state laws, the trustee for the holders of
asset-backed securities backed by automobile receivables may
 
                                       B-7
<PAGE>   27
 
not have a proper security interest in all of the obligations backing such
receivables. Therefore, there is the possibility that recoveries on repossessed
collateral may not, in some cases, be available to support payments on these
securities.
 
  Zero-coupon securities.  Zero-coupon securities pay no cash interest but are
sold at substantial discounts from their value at maturity. When a zero-coupon
bond is held to maturity, its entire investment return comes from the difference
between its purchase price and its maturity value. The market values of such
securities are generally subject to greater fluctuations in response to market
rates of interest than bonds that pay interest currently. Because such
securities allow an issuer to avoid the need to generate cash to meet current
interest payments, such bonds may involve greater credit risk than bonds paying
cash interest currently.
 
  Premium securities.  A Fund may at times invest in securities bearing coupon
rates higher than prevailing market rates. Such "premium" securities are
typically purchased at prices greater than the principal amounts payable on
maturity. If an issuer were to redeem securities held by a Fund during a time of
declining interest rates, the Fund may not be able to reinvest the proceeds in
securities providing the same investment return as the securities redeemed. If
securities purchased by a Fund at a premium are called or sold prior to
maturity, the Fund generally will recognize a capital loss to the extent the
call or sale price is less than the Fund's adjusted tax basis in such
securities. Additionally, a Fund generally will recognize a capital loss if it
holds such securities to maturity.
 
  Adjustable and Floating Rate Securities.  Adjustable rate securities are
securities having interest rates which are adjusted or reset at periodic
intervals ranging, in general, from one day to several years, based on a spread
over a specific interest rate or interest rate index or on the results of
periodic auctions. There are three main categories of indices: (i) those based
on U.S. Government Securities; (ii) those derived from a calculated measure such
as a cost of funds index; and (iii) those based on a moving average of interest
rates, including mortgage rates. Commonly utilized indices include, for example,
the One Year Constant Maturity Treasury Index, the London Interbank Offered Rate
(LIBOR), the Federal Home Loan Bank Cost of Funds, the prime rate and commercial
paper rates.
 
  Adjustable rate securities allow a Fund to participate in all or a portion of
increases in interest rates through periodic upward adjustments of the coupon
rates of such securities, resulting in higher yields. During periods of
declining interest rates, however, coupon rates may readjust downward resulting
in lower yields to the Fund. During periods of rising interest rates, changes in
the coupon rate of adjustable rate securities will lag behind changes in the
market interest rate, which may result in such security having a lower value
until the coupon resets to reflect more closely market interest rates.
Adjustable rate securities frequently limit the maximum amount the rate may be
adjusted during any adjustment period, in any one year or during the term of the
security.
 
   
  Defensive Strategies.  In certain circumstances market conditions may, in the
Adviser's judgment, make pursuing a Fund's basic investment strategy
inconsistent with the best interests of its shareholders. At such times, the
Adviser may use alternative strategies primarily designed to reduce fluctuations
in the value of the Fund's assets. In implementing these "defensive" strategies,
a Fund may invest to a substantial degree in high-quality, short-term
obligations. Such obligations may include: obligations of the U.S. Government,
its agencies or instrumentalities; other debt securities rated within the three
highest grades by either Standard and Poor's Ratings Group ("S&P") or Moody's
Investor Services, Inc. ("Moody's") (or comparably rated by any other nationally
recognized statistical rating organization ("NRSRO")); commercial paper rated in
the highest grade by either rating service (or comparably
    
 
                                       B-8
<PAGE>   28
 
rated by any other nationally recognized statistical rating organization);
certificates of deposit and bankers' acceptances; repurchase agreements with
respect to any of the foregoing investments; or any other fixed-income
securities that the Adviser considers consistent with such strategy.
 
                              INVESTMENT PRACTICES
 
BORROWINGS
 
  Each Fund may borrow money from banks for temporary, emergency purposes only
(such as meeting share redemption requests), although no Fund expects to do so
in an amount exceeding 5% of its respective total assets (after giving effect to
any such borrowing). Borrowing creates special risk considerations such as
changes in the net asset value of the shares and in the yield on the Fund's
portfolio. Borrowing will create interest expenses for a Fund which can exceed
the income from the assets retained.
 
"WHEN ISSUED" AND "DELAYED DELIVERY" TRANSACTIONS
 
  Each Fund may purchase and sell portfolio securities on a "when issued" and
"delayed delivery" basis. No income accrues to or is earned by a Fund on
purchases of portfolio securities in connection with such transactions prior to
the date the Fund actually takes delivery of such securities. These transactions
are subject to market fluctuation; the value of such securities at delivery may
be more or less than their purchase price, and yields generally available on
such securities when delivery occurs may be higher than yields on such
securities obtained pursuant to such transactions. Because a Fund relies on the
buyer or seller, as the case may be, to consummate the transaction, failure by
the other party to complete the transaction may result in the Fund missing the
opportunity of obtaining a price or yield considered to be advantageous. When a
Fund is the buyer in such a transaction, however, it will maintain, in a
segregated account with its custodian, cash or high-grade portfolio securities
having an aggregate value equal to the amount of such purchase commitments until
payment is made. A Fund will make commitments to purchase securities on such
basis only with the intention of actually acquiring these securities, but a Fund
may sell such securities prior to the settlement date if such sale is considered
to be advisable. To the extent a Fund engages in "when issued" and "delayed
delivery" transactions, it will do so for the purpose of acquiring securities
for the Fund's portfolio consistent with the Fund's investment objectives and
policies and not for the purposes of investment leverage. No specific limitation
exists as to the percentage of a Fund's assets which may be used to acquire
securities on a "when issued" or "delayed delivery" basis.
 
                       DESCRIPTION OF SECURITIES RATINGS
 
   
  STANDARD & POOR'S RATINGS GROUP--A brief description of the applicable S&P
rating symbols and their meanings (as published by S&P) follows:
    
 
   
       An S&P corporate or municipal debt rating is a current assessment of the
     creditworthiness of an obligor with respect to a specific obligation. This
     assessment may take into consideration obligors such as guarantors,
     insurers, or lessees.
    
 
       The debt rating is not a recommendation to purchase, sell, or hold a
     security, inasmuch as it does not comment as to market price or suitability
     for a particular investor.
 
                                       B-9
<PAGE>   29
 
       The ratings are based on current information furnished by the issuer or
     obtained by S&P from other sources it considers reliable. S&P does not
     perform an audit in connection with any rating and may, on occasion, rely
     on unaudited financial information. The ratings may be changed, suspended,
     or withdrawn as a result of changes in, or unavailability of, such
     information, or based on other circumstances.
 
      The ratings are based, in varying degrees, on the following
      considerations:
 
      1. Likelihood of default--capacity and willingness of the obligor as to
         the timely payment of interest and repayment of principal in accordance
         with the terms of the obligation:
 
      2. Nature of and provisions of the obligation:
 
      3. Protection afforded by, and relative position of, the obligation in the
         event of bankruptcy, reorganization, or other arrangement under the
         laws of bankruptcy and other laws affecting creditor's rights.
 
LONG-TERM DEBT--INVESTMENT GRADE
 
   
  AAA: Debt rated "AAA" has the highest rating assigned by S&P. Capacity to pay
interest and repay principal is extremely strong.
    
 
  AA: Debt rated "AA" has a very strong capacity to pay interest and repay
principal and differs from the highest rated issues only in small degree.
 
  A: Debt rated "A" has a strong capacity to pay interest and repay principal
although it is somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions than debt in the higher rated categories.
 
  BBB: Debt rated "BBB" is regarded as having an adequate capacity to pay
interest and repay principal. Whereas it normally exhibits adequate protection
parameters, adverse economic conditions or changing circumstances are more
likely to lead to a weakened capacity to pay interest and repay principal for
debt in this category than in higher rated categories.
 
  PLUS (+) OR MINUS (-): The ratings from "AA" to "CCC" may be modified by the
addition of a plus or minus sign to show relative standing within the major
rating categories.
 
  Debt Obligations of Issuers outside the United States and its territories are
rated on the same basis as domestic corporate and municipal issues. The ratings
measure the creditworthiness of the obligor but do not take into account
currency exchange and related uncertainties.
 
  Bond Investment Quality Standards:  Under present commercial bank regulations
issued by the Comptroller of the Currency, bonds rated in the top four
categories ('AAA', 'AA', 'A,' 'BBB', commonly known as "investment grade"
ratings) are generally regarded as eligible for bank investment. In addition,
the laws of various states governing legal investments impose certain rating or
other standards for obligations eligible for investment by savings banks, trust
companies, insurance companies and fiduciaries generally.
 
COMMERCIAL PAPER
 
   
  An S&P commercial paper rating is a current assessment of the likelihood of
timely payment of debt considered short-term in the relevant market.
    
 
                                      B-10
<PAGE>   30
 
  Ratings are graded into several categories, ranging from "A-1" for the highest
quality obligations to "D" for the lowest. These categories are as follows:
 
        A-1   This highest category indicates that the degree of safety
             regarding timely payment is strong. Those issues determined to
             possess extremely strong safety characteristics are denoted with a
             plus sign (+) designation.
 
   
  A commercial paper rating is not a recommendation to purchase, sell, or hold a
security inasmuch as it does not comment as to market price or suitability for a
particular investor. The ratings are based on current information furnished to
S&P by the issuer or obtained from other sources it considers reliable. S&P does
not perform an audit in connection with any rating and may, on occasion, rely on
unaudited financial information. The ratings may be changed, suspended or
withdrawn as a result of changes in or unavailability of such information.
    
 
VARIABLE RATE DEMAND BONDS
 
   
  S&P assigns "dual" ratings to all long-term debt issues that have as part of
their provisions a variable rate demand or double feature.
    
 
  The first rating addresses the likelihood of repayment of principal and
interest as due, and the second rating addresses only the demand feature. The
long-term debt rating symbols are used for bonds to denote the long-term
maturity and the commercial paper rating symbols are used to denote the put
option (for example, 'AAA/A-1') or if the nominal maturity is short, a rating of
'SP-1+/AAA' is assigned.
 
NOTES
 
   
  S&P note rating reflects the liquidity concerns and market access risks unique
to notes. Notes due in 3 years or less will likely receive a note rating. Notes
maturing beyond 3 years will most likely receive a long-term debt rating. The
following criteria will be used in making that assignment:
    
 
  -- Amortization schedule (the longer the final maturity relative to other
     maturities the more likely it will be treated as a note).
 
  -- Source of payment (the more dependent the issue is on the market for its
     refinancing, the more likely it will be treated as a note).
 
  Note rating symbols are as follows:
 
          SP-1 Very strong or strong capacity to pay principal and interest.
               Those issues determined to possess overwhelming safety
               characteristics will be given a plus (+) designation.
 
   
  MOODY'S INVESTORS SERVICE -- A brief description of the applicable Moody's
rating symbols and their meanings (as published by Moody's) follows:
    
 
LONG-TERM DEBT
 
  AAA: Bonds which are rated Aaa are judged to be of the best quality. They
carry the smallest degree of investment risk and are generally referred to as
"gilt edge." Interest payments are protected by a large or by an exceptionally
stable margin and principal is secure. While the various protective elements are
likely to change, such changes as can be visualized are most unlikely to impair
the fundamentally strong position of such issues.
 
  AA: Bonds which are rated Aa are judged to be of high quality by all
standards. Together with the Aaa group they comprise what are generally known as
high grade bonds. They are rated lower than the best
 
                                      B-11
<PAGE>   31
 
bonds because margins of protection may not be as large as in Aaa securities or
fluctuation of protective elements may be of greater amplitude or there may be
other elements present which make the long-term risks appear somewhat larger
than Aaa securities.
 
  A: Bonds which are rated A possess many favorable investment attributes and
are to be considered as upper medium grade obligations. Factors giving security
to principal and interest are considered adequate but elements may be present
which suggest a susceptibility to impairment sometime in the future.
 
  BAA: Bonds which are rated Baa are considered as medium grade obligations,
i.e., they are neither highly protected nor poorly secured. Interest payment and
principal security appear adequate for the present but certain protective
elements may by lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well.
 
  Note: Moody's applies the numerical modifiers 1, 2, and 3 in each generic
rating classification from AA through B in its corporate bond rating system. The
modifier 1 indicates that the security ranks in the higher end of its generic
rating category; the modifier 2 indicates a mid-range ranking; and the modifier
3 indicates that the issue ranks in the lower end of its generic rating
category.
 
SHORT-TERM DEBT
 
  Moody's short-term debt ratings are opinions of the ability of issuers to
repay punctually senior debt obligations which have an original maturity not
exceeding one year.
 
  Among the obligations covered are commercial paper, Eurocommercial paper, bank
deposits, banker's acceptances and obligations to deliver foreign exchange.
Obligations relying upon support mechanisms such as letters-of-credit and bonds
of indemnity are excluded unless explicitly rated.
 
  Issuers rated Prime-1 (or supporting institutions) have a superior ability for
repayment of senior short-term debt obligations. Prime-1 repayment ability will
often be evidenced by many of the following characteristics:
       --Leading market positions in well-established industries.
       --High rates of return on funds employed.
       -- Conservative capitalization structure with moderate reliance on debt
         and ample asset protection.
       -- Broad margins in earnings coverage of fixed financial charges and high
         internal cash generation.
       -- Well-established access to a range of financial markets and assured
         sources of alternate liquidity.
 
  Issuers rated Not Prime do not fall within any of the Prime rating categories.
 
  Obligations of a branch of a bank are considered to be domiciled in the
country in which the branch is located. Unless noted as an exception, Moody's
rating on a bank's ability to repay senior obligations extends only to branches
located in countries which carry a Moody's Sovereign Rating for Bank Deposits.
Such branch obligations are rated at the lower of the bank's rating or Moody's
Sovereign Rating for Bank Deposits for the country in which the branch is
located.
 
                                      B-12
<PAGE>   32
 
  When the currency in which an obligation is denominated is not the same as the
currency of the country in which the obligation is domiciled, Moody's ratings do
not incorporate an opinion as to whether payment of hue obligation will be
attended by actions of the government controlling the currency of denomination.
In addition, risks associated with bilateral conflicts between an investor's
home country and either the issuer's home country or the country where an
issuer's branch is located are not incorporated into Moody's short-term debt
ratings.
 
  Moody's makes no representation that rated bank or insurance company
obligations are exempt from the registration under the U.S. Securities Act of
1933 or issued in conformity with any other applicable law or regulation. Nor
does Moody's represent that any specific bank or insurance company obligation is
legally enforceable or a valid senior obligation of a rated issuer.
 
  If an issuer represents to Moody's that its short-term debt obligations are
supported by the credit of another entity or entities, then the name or names of
such supporting entity or entities are listed within the parentheses beneath the
name of the issuer, or there is a footnote referring the reader to another page
for the name or names of the supporting entity or entities. In assigning ratings
to such issuers, Moody's evaluates the financial strength of hue affiliated
corporations, commercial banks, insurance companies, foreign governments or
other entities, but only as one factor in the total rating assessment. Moody's
makes no representation and gives no opinion on the legal validity or
enforceability of any support arrangement.
 
  Moody's ratings are opinions, not recommendations to buy or sell, and their
accuracy is not guaranteed. A rating should be weighed solely as one factor in
an investment decision and you should make your own study and evaluation of any
issuer whose securities or debt obligations you consider buying or selling.
 
                             TRUSTEES AND OFFICERS
 
  The Declaration of Trust of the Funds provides that the Board of Trustees
shall consist of not less than three nor more than eleven trustees. The Funds do
not contemplate holding regular meetings of shareholders to elect Trustees or
otherwise. In the event a vacancy occurs on the Board of Trustees by reason of
death, resignation or a reason other than removal by the shareholders, the
remaining Trustees shall appoint a person to fill the vacancy for the entire
unexpired term.
 
   
  The table below sets forth the officers and trustees of the Fund, their
principal occupations for the last five years and their affiliations, if any,
with the Adviser, Van Kampen American Capital Investment Advisory Corp.
("Advisory Corp." or "VK Adviser"), Van Kampen American Capital Asset
Management, Inc. ("Asset Management" or "AC Adviser"), Van Kampen American
Capital Distributors, Inc. ("VKACDI"), Van Kampen American Capital, Inc.
("VKAC"), Van Kampen American Capital Advisors, Inc., ACCESS Investor Services,
Inc. (ACCESS), Van Kampen Merritt Equity Advisors Corp., Van Kampen American
Capital Insurance Agency of Illinois, Inc., VK/AC System, Inc., Van Kampen
American Capital RecordKeeping Services, Inc., American Capital Contractual
Services, Inc., Van Kampen American Capital Trust Company, Van Kampen American
Capital Exchange Corporation or VK/AC Holding, Inc. (affiliates of the Adviser).
Unless otherwise noted the address of each of the Trustees and officers is One
Parkview Plaza, Oakbrook Terrace, IL 60181.
    
 
                                      B-13
<PAGE>   33
 
   
  The following sets forth the names, ages, principal occupations and other
information regarding the Trustees.
    
 
   
<TABLE>
<CAPTION>
                                                       PRINCIPAL OCCUPATIONS OR
        NAME, ADDRESS AND AGE                         EMPLOYMENT IN PAST 5 YEARS
        ---------------------                         --------------------------
<S>                                    <C>
David C. Arch........................  Trustee. Mr. Arch is Chairman and Chief Executive Officer
1800 Swift Drive                       of Blistex Inc., a consumer health care products
Oak Brook, IL 60521                    manufacturer. Mr. Arch is also a Trustee, Director or
  Date of Birth 07/17/45               Managing General Partner of other investment companies
                                       advised by Asset Management and Advisory Corp.
Rod Dammeyer.........................  Trustee. Mr. Dammeyer is Managing Partner of Equity Group
Two North Riverside Plaza              Investments, Inc. (EGI), a company that makes private
Chicago, IL 60606                      equity investments in other companies, and Chief
  Date of Birth 11/05/40               Executive Officer and Director of Anixter International
                                       Inc., a value-added provider of integrated networking and
                                       cabling solutions that support business information and
                                       network infrastructure requirements (employed by Anixter
                                       since 1985). Prior to 1997, Mr. Dammeyer was President,
                                       Chief Executive Officer and a Director of Great American
                                       Management & Investment, Inc., a diversified
                                       manufacturing company. He is also a member of the Board
                                       of Directors of TeleTech Holdings Inc., Lukens, Inc.,
                                       Metal Management, Inc., Stericycle, Inc., Transmedia
                                       Networks, Inc., Jacor Communications, Inc., CNA Surety,
                                       Corp., IMC Global Inc., Antec Corporation, Groupo
                                       Azucarero Mexico (GAM) and a member of the Chase
                                       Manhattan Corporation National Advisory Board and Kent
                                       State University Foundation. Mr. Dammeyer was previously
                                       a Director of Santa Fe Energy Resources, Inc., Falcon
                                       Building Products, Inc., Lomas Financial Corporation,
                                       Santa Fe Pacific Corporation, Q-Tel, S.A. de C.V. and
                                       Servicios Financieros Quadrum, S.A. Prior to 1998, Mr.
                                       Dammeyer was a Director of Capsure Holdings Corp., Revco
                                       D.S., Inc. and Sealy, Inc. His address is Two North
                                       Riverside Plaza, Suite 1950, Chicago, Illinois 60606. Mr.
                                       Dammeyer is also a Trustee, Director or Managing General
                                       Partner of other investment companies advised by Asset
                                       Management and the Advisory Corp.
Howard J Kerr........................  Trustee. Prior to 1998, Mr. Kerr was the President and
736 North Western Ave.                 Chief Executive Officer of Pocklington Corporation, Inc.,
P.O. Box 317                           an investment holding company. Mr. Kerr is a Director of
Lake Forest, IL 60045                  Canbra Foods, Ltd., a Canadian oilseed crushing,
  Date of Birth 11/17/35               refining, processing and packaging operation. Mr. Kerr is
                                       a Trustee, Director or Managing General Partner of other
                                       investment companies advised by Asset Management and the
                                       Advisory Corp.
</TABLE>
    
 
                                      B-14
<PAGE>   34
 
   
<TABLE>
<CAPTION>
                                                       PRINCIPAL OCCUPATIONS OR
        NAME, ADDRESS AND AGE                         EMPLOYMENT IN PAST 5 YEARS
        ---------------------                         --------------------------
<S>                                    <C>
Dennis J. McDonnell*.................  President, Chairman of the Board and Trustee. Mr.
One Parkview Plaza                     McDonnell is President, Chief Operating Officer and a
Oakbrook Terrace, IL 60181             Director of the Adviser, Van Kampen American Capital
  Date of Birth 05/20/42               Asset Management, Inc. ("Asset Management") and Van
                                       Kampen American Capital Advisors, Inc. ("Advisors Inc.").
                                       He is also an Executive Vice President of VKAC. Prior to
                                       April of 1997, he was a Director of Van Kampen Merritt
                                       Equity Holding Corp. Prior to September of 1996, Mr.
                                       McDonnell was Chief Executive Officer and Director of MCM
                                       Group, Inc., McCarthy, Crisanti & Maffei, Inc., MCM Asia
                                       Pacific Company, Limited and MCM (Europe) Limited. Prior
                                       to November 1996, Executive Vice President and a Director
                                       of VKAC Holdings. Prior to July of 1996, Mr. McDonnell
                                       was President, Chief Operating Officer and Trustee of VSM
                                       Inc. and VCJ Inc. Trustee, Chief Executive Officer and
                                       Executive Vice President of certain open-end and
                                       closed-end investment companies advised by Advisory Corp.
                                       and Asset Management.
Steven Muller........................  Trustee. President Emeritus of The Johns Hopkins
The Johns Hopkins University,          University. Director of Beneficial Corporation (bank
Suite 711,                             holding company) and Millipore Corporation
1619 Massachusetts Avenue, N.W.,       (biotechnology). Prior to December of 1997, Dr. Muller
Washington, D.C. 20036.                was a Trustee of the Common Sense Trust and Chairman of
  Date of Birth 11/22/27               The 21(st) Century Foundation (public affairs). Prior to
                                       May of 1997, a Director of BT Alex. Brown & Sons
                                       (investment banking). Dr. Muller is also a Trustee,
                                       Director or Managing General Partner of other investment
                                       companies advised by Asset Management and Advisory Corp.
Theodore A. Myers....................  Trustee. Mr. Myers is the Senior Financial Advisor (and
1940 East 6th Street                   prior to 1997, an Executive Vice President and Chief
Cleveland, OH 44114                    Financial Officer) of Qualitech Steel Corporation, a
  Date of Birth 08/03/30               producer of high quality engineered steels for
                                       automotive, transportation and capital goods industries.
                                       Prior to 1997, a Director of McLouth Steel. A member of
                                       the Arthur Andersen Chief Financial Officer Advisory
                                       Committee. Prior to August, 1993, Mr. Myers was Senior
                                       Vice President, Chief Financial Officer and a Director of
                                       Food Brands America (formerly known as Doskocil
                                       Companies, Inc.), a food processing and distribution
                                       company. Mr. Myers is also a Trustee, Director or
                                       Managing General Partner of other investment companies
                                       advised by Asset Management and Advisory Corp. and is a
                                       trustee of COVA Series Trust.
</TABLE>
    
 
                                      B-15
<PAGE>   35
 
   
<TABLE>
<CAPTION>
                                                       PRINCIPAL OCCUPATIONS OR
        NAME, ADDRESS AND AGE                         EMPLOYMENT IN PAST 5 YEARS
        ---------------------                         --------------------------
<S>                                    <C>
Don G. Powell,.......................  Trustee. Mr. Powell is Chairman and a Director of VKAC,
Date of Birth 10/19/39,                the Distributor, the Adviser, the AC Adviser, VK/AC
                                       Holding, Inc., Van Kampen American Capital Advisors,
                                       Inc., ACCESS Investor Services, Inc., Van Kampen American
                                       Capital Recordkeeping Services, Inc., American Capital
                                       Contractual Services, Inc., Van Kampen Merritt Equity
                                       Advisors Corp., Van Kampen American Capital Insurance
                                       Agency of Illinois, Inc., VK/AC System, Inc., Van Kampen
                                       American Capital Trust Company, Van Kampen American
                                       Capital Services, Inc. and Van Kampen American Capital
                                       Exchange Corporation. Prior to July of 1996, Mr. Powell
                                       was Chairman and Director of VSM Inc. and VCJ Inc. Prior
                                       to September 1996, Mr. Powell was Chairman and Director
                                       of McCarthy, Crisanti & Maffei, Inc. and McCarthy,
                                       Crisanti & Maffei Acquisition Corporation. Prior to 1997,
                                       he was Chairman, President and Director of American
                                       Capital Shareholders Corporation. Prior to April of 1997,
                                       Mr. Powell was Chairman, President and Director of Van
                                       Kampen Merritt Equity Holdings Corp. Mr. Powell is
                                       Chairman of the Board of Governors and the Executive
                                       Committee of the Investment Company Institute. Mr. Powell
                                       is also a Trustee or Director of other investment
                                       companies advised by Asset Management, Advisory Corp. and
                                       their affiliates.
Hugo F. Sonnenschein.................  Trustee. Mr. Sonnenschein is President of the University
5801 South Ellis Avenue                of Chicago. Mr. Sonnenschein is a member of the Board of
Suite 502                              Trustees of the University of Rochester and a member of
Chicago, IL 60637                      its investment committee. Prior to July, 1993, Mr.
Date of Birth 11/14/40                 Sonnenschein was Provost of Princeton University and Dean
                                       of the School of Arts and Sciences at the University of
                                       Pennsylvania. Mr. Sonnenschein is a member of the
                                       National Academy of Sciences and a fellow of the American
                                       Academy of Arts and Sciences. Mr. Sonnenschein is also a
                                       Trustee, Director or Managing General Partner of other
                                       investment companies advised by Asset Management and
                                       Advisory Corp.
Wayne W. Whalen*.....................  Trustee. Mr. Whalen is a partner in the law firm of
333 West Wacker Drive                  Skadden, Arps, Slate, Meagher & Flom (Illinois), legal
Chicago, IL 60606                      counsel to the funds in the Fund Complex and certain
Date of Birth 08/22/39                 open-end investment companies advised by the Adviser and
                                       Asset Management. Mr. Whalen is also a Trustee, Director
                                       or Managing General Partner of other investment companies
                                       advised by Asset Management, Advisory Corp. and their
                                       affiliates.
</TABLE>
    
 
- ---------------
   
* Such Trustees are "interested persons" (within the meaning of Section 2(a)(19)
  of the 1940 Act). Messrs. McDonnell and Powell are interested persons of the
  Adviser and the Funds by reason of their positions with the Adviser. Mr.
  Whalen is an interested person of the Funds by reason of his firm acting as
  legal counsel for the Funds.
    
 
                                      B-16
<PAGE>   36
 
   
  The Funds' audit committee consists of Messrs. Arch, Dammeyer, Kerr, Muller,
Myers and Sonnenschein, who are not "interested persons" of the Funds as defined
in the 1940 Act. The committee is primarily responsible for supervision of the
Funds' independent auditors and the annual review of the investment advisory
agreement and any other matters requiring the approval of the Trustees who are
not "interested persons" of the Funds pursuant to the 1940 Act.
    
 
   
  For the fiscal year of each fund in the Fund Complex (defined below) ended in
1997, the retirement plan committee consisted of Messrs. Arch, Dammeyer and
Sonnenschein. The retirement plan committee is responsible for reviewing the
terms of each Fund's retirement plan and reviews any administrative matters with
respect thereto. The retirement plan committee does not meet on a regular basis,
but does meet on an ad hoc basis as necessary to administer the retirement plan.
    
 
  The Trustees select and nominate trustees to fill any vacancies in
trusteeships and are prepared to review nominations from shareholders.
Nominations from shareholders should be in writing and addressed to the Trustees
at the Funds' office. The Trustees expect to be able to identify from their own
resources an ample number of qualified candidates.
 
   
   The officers and Trustees hold the same positions with other funds in the
Fund Complex (defined below). The officers and Trustees as a group own less than
1% of the Fund's outstanding Common Shares. The compensation of the officers and
trustees who are affiliated persons (as defined in the 1940 Act) of the Adviser,
VKACDI or VKAC is paid by the respective entity. The Fund pays the compensation
of all other officers and trustees of the Fund. Funds in the Fund Complex,
including the Fund, pay the Trustees who are not affiliated persons of the
Adviser, VKACDI or VKAC, an annual retainer of $97,500, which retainer is
allocated among the funds based on the relative net assets of such funds, and
$250 per fund per meeting of the Board of Trustees, as well as reimbursement of
expenses incurred in connection with such meetings. Under the Funds' retirement
plans, trustees who are not affiliated with the Adviser, VKACDI or VKAC, have at
least ten years of service (including years of service prior to adoption of the
retirement plan) and retire at or after attaining the age of 60, are eligible to
receive a retirement benefit from each Fund equal to $2,500 for each of the ten
years following such trustee's retirement. Under certain conditions, reduced
benefits are available for early retirement. Under the Funds' deferred
compensation plans, a trustee who is not affiliated with the Adviser, VKACDI or
VKAC can elect to defer receipt of all or a portion of the trustee's fees earned
by such trustee until such trustee's retirement. The deferred compensation earns
a rate of return determined by reference to the Funds or other funds in the Fund
Complex selected by the trustee. To the extent permitted by the 1940 Act, the
Fund may invest in securities of other funds in the Fund Complex in order to
match the deferred compensation obligation. The deferred compensation plan is
not funded and obligations thereunder represent general unsecured claims against
the general assets of the Funds. Subject to certain exceptions and limitations,
as fully described in Section 5.3 of the Fund's Declaration of Trust on file
with the SEC, the Funds indemnify every Trustee and officer of the Funds against
liabilities and expenses reasonably incurred or paid in connection with any
claim, action, suit or proceeding in which he becomes involved by virtue of his
being or having been a Trustee or officer. Such indemnification is unavailable
for any Trustee or officer who is deemed to have engaged in willful misfeasance,
bad faith, gross negligence or reckless disregard of his duties or to not have
acted in good faith in the reasonable belief that his action was in the best
interest of the Fund.
    
 
                                      B-17
<PAGE>   37
 
   
                               COMPENSATION TABLE
    
 
   
<TABLE>
<CAPTION>
                                                               AGGREGATE PENSION                           TOTAL
                        YEAR FIRST          AGGREGATE            OR RETIREMENT        ESTIMATED        COMPENSATION
                       APPOINTED OR        COMPENSATION        BENEFITS ACCRUED    AGGREGATE ANNUAL   BEFORE DEFERRAL
                        ELECTED TO       BEFORE DEFERRAL          AS PART OF        BENEFITS UPON        FROM FUND
       NAME(1)          THE BOARD     FROM THE REGISTRANT(2)      EXPENSES(3)       RETIREMENT(4)       COMPLEX(5)
       -------         ------------   ----------------------   -----------------   ----------------   ---------------
<S>                    <C>            <C>                      <C>                 <C>                <C>
David C. Arch........      1994               $3,028                $ 7,912            $85,000           $157,750
Rod Dammeyer.........      1994                3,028                 14,303             85,000            157,750
Howard J Kerr........      1994                3,028                 27,338             85,000            157,750
Steven Muller........      1998                    0                      0                  0                  0
Theodore A. Myers....      1994                3,028                 57,361             85,000            157,750
Hugo F.
  Sonnenschein.......      1994                3,028                 13,493             85,000            157,750
Wayne W. Whalen......      1994                3,028                 16,155             85,000            157,250
</TABLE>
    
 
- ---------------
   
(1)  Messrs. McDonnell and Powell are affiliated person of the Adviser, VKACDI
     and VKAC, and do not receive compensation or retirement benefits from the
     Funds.
    
 
   
(2)  The amounts shown in this column represent the Aggregate Compensation
     before Deferral with respect to the Registrant's fiscal year ended December
     31, 1997. The following trustees deferred compensation from the Registrant
     during the fiscal year ended December 31, 1997 as follows: Mr. Dammeyer,
     $3,028; Mr. Kerr, $3,028; Mr. Sonnenschein, $3,028 and Mr. Whalen, $3,028.
     Amounts deferred are retained by the respective Fund and earn a rate of
     return determined by reference to either the return on the common shares of
     the Fund or other funds in the Fund Complex as selected by the respective
     Non-Affiliated Trustee, with the same economic effect as if such
     Non-Affiliated Trustee had invested in one or more funds in the Fund
     Complex. To the extent permitted by the 1940 Act, the Funds may invest in
     securities of these funds selected by the trustees in order to match the
     deferred compensation obligation. The cumulative deferred compensation
     (including interest) accrued with respect to each trustee from the
     Registrant as of December 31, 1997 is as follows: Mr. Dammeyer, $3,172; Mr.
     Kerr, $3,172; Mr. Sonnenschein, $3,272 and Mr. Whalen $3,272.
    
 
   
(3)  The amounts shown in this column represent the sum of the estimated Pension
     or Retirement Benefit Accruals expected to be accrued by the 36 operating
     funds in the Fund Complex as of December 31, 1997 for their respective
     fiscal years end in 1997. The retirement plan is described above the table.
    
 
   
(4)  The amounts shown in this column represent the sum of the estimated annual
     benefits payable per year by the 36 operating funds in the Fund Complex as
     of December 31, 1997 for each year of the 10-year period commencing in the
     year of such trustee's anticipated retirement. The retirement plan is
     described above the compensation table.
    
 
   
(5)  The "Fund Complex" currently consists of 41 investment companies (including
     the Funds) advised by the Adviser or its affiliates that have the same
     members on each investment company's Board of Trustees. The amounts shown
     in this column are accumulated from the Aggregate Compensation of 36
     operating investment companies in the Fund Complex for the year ended
     December 31, 1997 before deferral by the trustees under the deferred
     compensation plan. Amounts deferred are retained by the respective Fund and
     earn a rate of return determined by reference to either the return on the
     Common Shares of such Fund or common shares of other funds in the Fund
     Complex (as defined below) as selected by the respective trustee. To the
     extent permitted by the 1940 Act, the respective fund may invest in
     securities of the funds selected by the trustees in order to match the
     deferred compensation obligation. The Adviser and its affiliates also serve
     as investment adviser
    
 
                                      B-18
<PAGE>   38
 
   
     for other investment companies; however, with the exception of Mr. Whalen,
     the Trustees are not trustees of other affiliated investment companies.
     Combining the Fund Complex with other investment companies advised by the
     Adviser or its affiliates, Mr. Whalen received Total Compensation of
     $268,447 for the year ended December 31, 1997.
    
 
   
  The following table sets forth certain information (other than information
concerning Messrs. McDonnell and Powell, which is set forth above) concerning
the executive officers of the Funds, each of whom holds the same office with
each of the other open-end and closed-end investment companies advised by the
Adviser, Advisory Corp or Asset Management. The officers serve for one year or
until their respective successors are chosen and qualified. Each Fund's officers
receive no compensation from the Fund but are officers of the Adviser or Van
Kampen American Capital and receive compensation in such capacities.
    
 
                                    OFFICERS
 
   
  The address for Curtis W. Morell, Tanya M. Loden, Huey P. Falgout, Jr. and M.
Robert Sullivan is 2800 Post Oak Blvd., Houston, TX 77056. The address for Peter
W. Hegel, Ronald A. Nyberg, Edward C. Wood III, John L. Sullivan, Nicholas
Dalmaso, Scott E. Martin, Weston B. Wetherell, Steven M. Hill, Edward A.
Treichel, John M. McCareins and Michael P. Kamradt is One Parkview Plaza,
Oakbrook Terrace, IL 60181.
    
 
   
<TABLE>
<CAPTION>
                                     POSITIONS AND                  PRINCIPAL OCCUPATIONS
        NAME AND AGE               OFFICES WITH FUND                 DURING PAST 5 YEARS
        ------------               -----------------                ---------------------
<S>                           <C>                           <C>
 
Peter W. Hegel..............  Vice President                Executive Vice President of the VK
  Date of Birth: 06/25/56                                   Adviser, AC Adviser, Van Kampen
                                                            American Capital Management, Inc. and
                                                            Van Kampen American Capital Advisors,
                                                            Inc. Prior to September 1996, Director
                                                            of McCarthy, Crisanti & Maffei, Inc.
                                                            Prior to July 1996, Director of VSM
                                                            Inc. Vice President of each of the Van
                                                            Kampen American Capital Funds and
                                                            other investment companies advised by
                                                            Advisory Corp., Asset Management or
                                                            their affiliates.
 
Curtis W. Morell............  Vice President and Chief      Senior Vice President of the VK
  Date of Birth: 08/04/46     Accounting Officer            Adviser and the AC Adviser. Vice
                                                            President and Chief Accounting Officer
                                                            of each of the Van Kampen American
                                                            Capital Funds and other investment
                                                            companies advised by Advisory Corp.,
                                                            Asset Management or their affiliates.
</TABLE>
    
 
                                      B-19
<PAGE>   39
 
   
<TABLE>
<CAPTION>
                                     POSITIONS AND                  PRINCIPAL OCCUPATIONS
        NAME AND AGE               OFFICES WITH FUND                 DURING PAST 5 YEARS
        ------------               -----------------                ---------------------
<S>                           <C>                           <C>
Ronald A. Nyberg............  Vice President and Secretary  Executive Vice President, General
  Date of Birth: 07/29/53                                   Counsel and Secretary of Van Kampen
                                                            American Capital and VK/AC Holding,
                                                            Inc. Executive Vice President, General
                                                            Counsel and a Director of the
                                                            Distributor, the VK Adviser, the AC
                                                            Adviser, Van Kampen American Capital
                                                            Management, Inc., Van Kampen Merritt
                                                            Equity Advisors Corp. and Van Kampen
                                                            Merritt Equity Holdings Corp.
                                                            Executive Vice President, General
                                                            Counsel and Assistant Secretary of Van
                                                            Kampen American Capital Advisors,
                                                            Inc., American Capital Contractual
                                                            Services, Inc., Van Kampen American
                                                            Capital Exchange Corporation, Van
                                                            Kampen American Capital Services, Inc.
                                                            and ACCESS. Executive Vice President,
                                                            General Counsel, Assistant Secretary
                                                            and Director of Van Kampen American
                                                            Capital Trust Company. Director of ICI
                                                            Mutual Insurance Co., a provider of
                                                            insurance to members of the Investment
                                                            Company Institute. Prior to September
                                                            1996, General Counsel of McCarthy,
                                                            Crisanti & Maffei, Inc. Prior to July
                                                            1996, Executive Vice President and
                                                            General Counsel of VSM Inc. and VCJ
                                                            Inc. Vice President and Secretary of
                                                            each of the Van Kampen American
                                                            Capital Funds and other investment
                                                            companies advised by Advisory Corp.,
                                                            Asset Management and their affiliates.
 
Edward C. Wood III..........  Vice President and Chief      Senior Vice President of the VK
  Date of Birth: 01/11/56     Financial Officer             Adviser, the AC Adviser and Van Kampen
                                                            American Capital Management, Inc. Vice
                                                            President and Chief Financial Officer
                                                            of each of the Van Kampen American
                                                            Capital Funds and other investment
                                                            companies advised by Advisory Corp.,
                                                            Asset Management and their affiliates.
 
John L. Sullivan............  Treasurer                     First Vice President of the VK Adviser
  Date of Birth: 08/20/55                                   and the AC Adviser. Treasurer of each
                                                            of the Van Kampen American Capital
                                                            Funds and other investment companies
                                                            advised by Advisory Corp., Asset
                                                            Management and their affiliates.
</TABLE>
    
 
                                      B-20
<PAGE>   40
 
   
<TABLE>
<CAPTION>
                                     POSITIONS AND                  PRINCIPAL OCCUPATIONS
        NAME AND AGE               OFFICES WITH FUND                 DURING PAST 5 YEARS
        ------------               -----------------                ---------------------
<S>                           <C>                           <C>
Tanya M. Loden..............  Controller                    Vice President of the VK Adviser and
  Date of Birth: 11/19/59                                   the AC Adviser. Controller of each of
                                                            the Van Kampen American Capital Funds
                                                            and other investment companies advised
                                                            by Advisory Corp., Asset Management
                                                            and their affiliates.
 
Nicholas Dalmaso............  Assistant Secretary           Vice President, Associate General
  Date of Birth: 03/01/65                                   Counsel and Assistant Secretary of Van
                                                            Kampen American Capital. Assistant
                                                            Vice President and Assistant Secretary
                                                            of the Distributor, the VK Adviser,
                                                            the AC Adviser and Van Kampen American
                                                            Capital Management, Inc. Assistant
                                                            Vice President of Van Kampen American
                                                            Capital Advisors, Inc. Assistant
                                                            Secretary of each of the Van Kampen
                                                            American Capital Funds and other
                                                            investment companies advised by
                                                            Advisory Corp., Asset Management and
                                                            their affiliates.
 
Huey P. Falgout, Jr.........  Assistant Secretary           Vice President and a Senior Attorney
  Date of Birth: 11/15/63                                   of Van Kampen American Capital. Vice
                                                            President and Assistant Secretary of
                                                            the VK Adviser and AC Adviser, ACCESS,
                                                            American Capital Contractual Services,
                                                            Inc., Van Kampen American Capital
                                                            Management, Inc., Van Kampen American
                                                            Capital Exchange Corporation, Van
                                                            Kampen American Capital Advisors, Inc.
                                                            and the Distributor. Assistant
                                                            Secretary of each of the Van Kampen
                                                            American Capital Funds and other
                                                            investment companies advised by
                                                            Advisory Corp., Asset Management and
                                                            their affiliates.
</TABLE>
    
 
                                      B-21
<PAGE>   41
 
   
<TABLE>
<CAPTION>
                                     POSITIONS AND                  PRINCIPAL OCCUPATIONS
        NAME AND AGE               OFFICES WITH FUND                 DURING PAST 5 YEARS
        ------------               -----------------                ---------------------
<S>                           <C>                           <C>
Scott E. Martin.............  Assistant Secretary           Senior Vice President, Deputy General
  Date of Birth: 08/20/56                                   Counsel and Assistant Secretary of Van
                                                            Kampen American Capital and VK/AC
                                                            Holding, Inc. Senior Vice President,
                                                            Deputy General Counsel and Secretary
                                                            of the VK Adviser, the AC Adviser, the
                                                            Distributor, Van Kampen American
                                                            Capital Management, Inc., Van Kampen
                                                            American Capital Advisors, Inc.,
                                                            American Capital Contractual Services,
                                                            Inc., Van Kampen American Capital
                                                            Exchange Corporation, Van Kampen
                                                            American Capital Services, Inc.,
                                                            ACCESS, Van Kampen Merritt Equity
                                                            Advisors Corp. and Van Kampen Merritt
                                                            Equity Holdings Corp. Prior to
                                                            September 1996, Deputy General Counsel
                                                            and Secretary of McCarthy, Crisanti &
                                                            Maffei, Inc. Prior to July 1996,
                                                            Senior Vice President, Deputy General
                                                            Counsel and Secretary of VSM Inc. and
                                                            VCJ Inc. Assistant Secretary of each
                                                            of the Van Kampen American Capital
                                                            Funds and other investment companies
                                                            advised by Advisory Corp., Asset
                                                            Management and their affiliates.
 
Weston B. Wetherell.........  Assistant Secretary           Vice President, Associate General
  Date of Birth: 06/15/56                                   Counsel and Assistant Secretary of Van
                                                            Kampen American Capital, the VK
                                                            Adviser, the AC Adviser, the
                                                            Distributor, Van Kampen American
                                                            Capital Management, Inc. and Van
                                                            Kampen American Capital Advisors, Inc.
                                                            Assistant Secretary of each of the Van
                                                            Kampen American Capital Funds and
                                                            other investment companies advised by
                                                            Advisory Corp., Asset Management and
                                                            their affiliates.
 
Steven M. Hill..............  Assistant Treasurer           Vice President of the VK Adviser and
  Date of Birth: 10/16/64                                   AC Adviser. Assistant Treasurer of
                                                            each of the Van Kampen American
                                                            Capital Funds and other investment
                                                            companies advised by Advisory Corp.,
                                                            Asset Management and their affiliates.
</TABLE>
    
 
                                      B-22
<PAGE>   42
 
   
<TABLE>
<CAPTION>
                                     POSITIONS AND                  PRINCIPAL OCCUPATIONS
        NAME AND AGE               OFFICES WITH FUND                 DURING PAST 5 YEARS
        ------------               -----------------                ---------------------
<S>                           <C>                           <C>
M. Robert Sullivan..........  Assistant Controller          Assistant Vice President of the VK
  Date of Birth: 03/30/33                                   Adviser and the AC Adviser. Assistant
                                                            Controller of each of the Van Kampen
                                                            American Capital Funds and other
                                                            investment companies advised by
                                                            Advisory Corp., Asset Management and
                                                            their affiliates.
Edward A. Treichel..........  Vice President                Senior Vice President of the Adviser
  Date of Birth: 08/21/43                                   and Senior Vice President of Advisory
                                                            Corp. and an agent of Van Kampen
                                                            American Capital Distributors, Inc.
                                                            Prior to 1992, Mr. Treichel was a
                                                            consultant with G.P. Lauter &
                                                            Associates, a financial consulting
                                                            firm.
John M. McCareins...........  Vice President                First Vice President of the Adviser
  Date of Birth: 01/31/49                                   and Advisory Corp. and an agent of Van
                                                            Kampen American Capital Distributors,
                                                            Inc.
Michael P. Kamradt..........  Vice President                First Vice President of the Adviser
  Date of Birth: 05/14/56                                   and Advisory Corp. and an agent of Van
                                                            Kampen American Capital Distributors,
                                                            Inc.
</TABLE>
    
 
   
  With respect to each Fund, as of April 4, 1998, the trustees and officers as a
group owned less than 1% of the outstanding shares of the Fund. At such date,
the "interested persons" of the Fund as a group owned an aggregate of less than
5% of the outstanding shares of the Fund and no person owned 5% or more of the
outstanding shares of the Fund except as noted below.
    
 
                                      B-23
<PAGE>   43
 
   
<TABLE>
<CAPTION>
                                  NAME AND ADDRESS OF                   AMOUNT OF          PERCENT OF
        FUND                        BENEFICIAL OWNER               BENEFICIAL OWNERSHIP       FUND
        ----                      -------------------              --------------------    ----------
<S>                      <C>                                       <C>                     <C>
ACTIVE CORE FUND         Wendel & Co.                                     542,782            46.74%
                         FBO General Income Trust
                         C/O Bank of NY Mutual FD Reorg Dept
                         PO Box 1066 Wall Street Station
                         New York, NY 10286
                         Wendel & Co.                                     526,403            45.33%
                         FBO Klukwan Inc. Permanent Fund
                         C/O Bank of NY Mutual FD Reorg Dept
                         PO Box 1066 Wall Street Station
                         New York, NY 10286
LIMITED DURATION FUND    Jerry McCall TR                                  214,350            86.71%
                         Plumbers Local Union Number 68
                         Group Protection PL DTD 1981
                         PO Box 8746
                         Houston, TX 77249-8746
                         Jerry McCall TR                                  247,201            11.26%
                         UA Plumbers Local Union 68
                         Apprenticeship Fund
                         DTD 03/29/56
                         PO Box 8746
                         Houston, TX 77249-8746
</TABLE>
    
 
   
  Those entities which own more than 25% of the outstanding shares of any Fund
would be deemed to control the Fund within the meaning of 1940 Act. No officer
or trustee of any Fund owns or would be able to acquire 5% or more of the common
stock of the Adviser or VK/AC Holding, Inc., the indirect parent company of the
Adviser.
    
 
                     INVESTMENT ADVISORY AND OTHER SERVICES
 
INVESTMENT ADVISORY AGREEMENT
 
   
  Van Kampen American Capital Management, Inc. (the "Adviser") is the investment
adviser for each of the Funds. The Adviser provides investment advice to a wide
variety of institutional, individual and investment company clients and,
together with its affiliates, had aggregate assets under management or
supervision of more than $60 billion. The Adviser was incorporated as a Delaware
corporation in 1990.
    
 
   
  The Adviser's principal office is located at One Parkview Plaza, Oakbrook
Terrace, Illinois 60181. The Adviser is a wholly-owned subsidiary of Van Kampen
American Capital, Inc., which in turn is an indirect wholly-owned subsidiary of
Morgan Stanley Dean Witter & Co. The principal office of the Fund, the Adviser,
the Distributor and VKAC is located at One Parkview Plaza, Oakbrook Terrace,
Illinois 60181.
    
 
   
  Morgan Stanley Dean Witter & Co. and various of its directly or indirectly
owned subsidiaries, including Morgan Stanley Asset Management Inc., an
investment adviser, Morgan Stanley & Co. Incorporated, a registered
broker-dealer and investment adviser, and Morgan Stanley International, are
engaged in a wide range of financial services. Their principal businesses
include securities underwriting, distribution and trading; merger, acquisition,
restructuring and other corporate finance advisory activities; merchant banking;
stock brokerage and research services; credit services; asset management;
    
 
                                      B-24
<PAGE>   44
 
trading of futures, options, foreign exchange, commodities and swaps (involving
foreign exchange, commodities, indices and interest rates); real estate advice,
financing and investing; and global custody, securities clearance services and
securities lending.
 
   
  The investment advisory agreement between the Adviser and each Fund provides
that the Adviser will supply investment research and portfolio management,
including the selection of securities for the Fund to purchase, hold or sell and
the selection of brokers and dealers through whom the Fund's portfolio
transactions are executed. The Adviser also administers the business affairs of
each Fund, furnishes offices, necessary facilities and equipment, provides
administrative services, and permits its officers and employees to serve without
compensation as officers of the Fund and trustees of the Trust if duly elected
to such positions. Day to day management of the portfolios of each Fund is the
responsibility of a team of officers of the Adviser.
    
 
  The agreement provides that the Adviser shall not be liable for any error of
judgment or of law, or for any loss suffered by a Fund in connection with the
matters to which the agreement relates, except a loss resulting from willful
misfeasance, bad faith or gross negligence on the part of the Adviser in the
performance of its obligations and duties, or by reason of its reckless
disregard of its obligations and duties under the agreement.
 
  The Adviser's activities are subject to the review and supervision of the
Board of Trustees of the Trust, of which each Fund is a series, to whom the
Adviser renders periodic reports of each Fund's investment activities. Each Fund
pays the Adviser a fee (accrued daily and paid monthly) equal to a percentage of
its respective average daily net assets as follows:
 
<TABLE>
<CAPTION>
                                                   AVERAGE
                                                    DAILY                   % PER
                 FUND                            NET ASSETS                 ANNUM
                 ----                            ----------                 -----
<S>                                       <C>                               <C>
Active Core Fund......................    Up to one billion dollars         0.30%
                                          Thereafter                        0.25%
Limited Duration Fund.................    Up to one billion dollars         0.30%
                                          Thereafter                        0.25%
</TABLE>
 
   
  Each Fund's investment advisory agreement with the Adviser dated May 31, 1997
was approved by the shareholders of each respective Fund on May 28, 1997. Each
agreement will continue until May 31, 1999, and will remain in effect from year
to year if specifically approved by the Trustees of the Trust or the Fund's
shareholders and by the disinterested Trustees of the Trust in compliance with
the requirements of the 1940 Act. Each agreement may be terminated without
penalty upon 60 days written notice by either party and will automatically
terminate in the event of assignment.
    
 
  Subject to the expense limitations discussed below, each Fund has agreed to
assume and pay the charges and expenses of its operations, including the
compensation of the Trustees of the Trust (other than those who are affiliated
persons, as defined in the 1940 Act, of the Trust, the Adviser or Van Kampen
American Capital Distributors, Inc.), the charges and expenses of independent
accountants, legal counsel, any transfer or dividend disbursing agent and the
custodian (including fees for safekeeping of securities), costs of calculating
net asset value, costs of acquiring and disposing of portfolio securities,
interest (if any) on obligations incurred by the Fund, costs of share
certificates, membership dues in the Investment Company Institute or any similar
organization, costs of trustee and officer errors and omissions insurance,
reports and notices to shareholders, costs of registering shares of the Funds
under the federal securities laws, miscellaneous expenses and all taxes and fees
to federal, state, foreign or other governmental agencies.
 
                                      B-25
<PAGE>   45
 
  EXPENSE LIMITATION. In the interest of limiting the expenses of the Funds, the
Adviser has agreed to waive fees or reimburse each Fund for certain expenses,
such that certain expenses of each Fund, including the advisory fees (but
excluding interest, taxes, brokerage commissions and other portfolio transaction
expenses, other expenditures which are capitalized in accordance with generally
accepted accounting principles, and any extraordinary costs and expenses) will
not exceed the following amounts (expressed as a percentage of average net
assets on an annual basis).
 
<TABLE>
<S>                                                             <C>
Active Core Fund............................................    0.40%
Limited Duration Fund.......................................    0.40%
</TABLE>
 
  Fees foregone or payments made by the Adviser with respect to a Fund pursuant
to the expense limitation are contingent liabilities of a Fund which are subject
to potential reimbursement by that Fund to the Adviser, provided that such
reimbursement may be made without causing the annual expense ratio of the Fund
to exceed the applicable limitation set forth above, or such lower amount as may
be imposed by any state expense limitation to which the Trust is subject, and
provided such reimbursement is made within four years of the recognition of the
contingent liability by the Fund. If a reimbursement appears probable, it will
be accounted for as an expense of the Fund regardless of the time period over
which the reimbursement may actually be paid by the Fund.
 
   
  Each Advisory Agreement specifies that the Adviser will reimburse the Fund for
annual expenses of the Fund which exceed the most stringent limits prescribed by
any State in which the Fund shares are offered for sale. The most stringent
limit as of the date of this Statement of Additional Information, as affecting
any Fund, requires the Adviser to reimburse a Fund to the extent that aggregate
expenses of the Fund (excluding interest, taxes and other expenses which may be
excludable under applicable state law) exceed in any fiscal year 2 1/2% of the
average annual net assets of the Fund up to $30 million, 2.00% of the average
annual net assets of the Fund of the next $70 million, and 1 1/2% of the
remaining average annual net assets of the Fund.
    
 
  In addition to making any required reimbursements, the Adviser may in its
discretion, but is not obligated to, waive all or any portion of its fee or
assume all or any portion of the expenses of a Fund.
 
   
  The Adviser has agreed to waive fees or reimburse certain expenses such that
the net expenses of each Fund will not exceed 0.40% of average net assets.
Should the assets of a particular fund increase sufficiently to allow for
reimbursement of prior year's excess expenses to the Adviser without causing
that fund's expense ratio to exceed 0.40%, that fund may be required to
reimburse the Adviser for fees waived or expenses assumed within the previous
four years. Therefore, these expenses totaling $137,325 and $151,534 for Active
Core Fund and Limited Duration Fund, respectively, could become liabilities of
each respective Fund at a future date.
    
 
OTHER AGREEMENTS
 
  FUND ACCOUNTING AGREEMENT. The Fund has also entered into a Fund accounting
agreement pursuant to which the Adviser provides accounting services. Such
services are expected to enable the Funds to more closely monitor and maintain
its accounts and records. The Fund shares together with the other Van Kampen
American Capital mutual funds advised by the Adviser, Van Kampen American
Capital Investment Advisory Corp., and distributed by the Distributor in the
cost of providing such services, with 25% of such costs shared proportionately
based on the respective number of classes of securities issued per fund and the
remaining 75% of such cost based proportionally on their respective net assets
per fund.
 
                                      B-26
<PAGE>   46
 
   
  For the period ended December 31, 1997, the Adviser waived its cost of
providing accounting services for each Fund.
    
 
  LEGAL SERVICES AGREEMENT. The Funds and each of the Van Kampen American
Capital funds advised by Van Kampen American Capital Investment Advisory Corp.,
and distributed by the Distributor have entered into Legal Services Agreements
pursuant to which Van Kampen American Capital, Inc. provides legal services,
including without limitation: accurate maintenance of the funds' minute books
and records, preparation and oversight of the funds' regulatory reports, and
other information provided to shareholders, as well as responding to day-to-day
legal issues on behalf of the funds. It is expected that Van Kampen American
Capital, Inc. can render such legal services on a more cost effective basis than
other providers of such services. Payment by the Fund for such services is made
on a cost basis for the employment of personnel as well as the overhead and the
equipment necessary to render such services. Other funds distributed by the
Distributor also receive legal services from Van Kampen American Capital, Inc.
Of the total costs for legal services provided to funds distributed by the
Distributor, one half of such costs are allocated equally to each fund and the
remaining one half of such costs are allocated to specific funds based on
monthly time records.
 
   
  For the period ended December 31, 1997, Van Kampen American Capital waived its
cost of providing legal services for each Fund.
    
 
CUSTODIAN AND INDEPENDENT ACCOUNTANTS
 
   
  State Street Bank and Trust Company, 225 West Franklin Street, P.O. Box 1713,
Boston, MA 02105-1713, is the custodian of each Fund and has custody of all
securities and cash of each Fund. The custodian, among other things, attends to
the collection of principal and income, and payment for and collection of
proceeds of securities bought and sold by each respective Fund.
    
 
  The independent accountants for each Fund are KPMG Peat Marwick LLP, 303 East
Wacker Drive, Chicago, IL 60601. The selection of independent accountants will
be subject to ratification by the shareholders of each Fund at any annual
meeting of shareholders.
 
                PORTFOLIO TRANSACTIONS AND BROKERAGE ALLOCATION
 
   
  The Adviser will place orders for portfolio transactions for a Fund with
broker-dealer firms giving consideration to the quality, quantity and nature of
each firm's professional services. These services include execution, clearance
procedures, wire service quotations and statistical and other research
information provided to the Fund and the Adviser, including quotations necessary
to determine the value of a Fund's net assets. Any research benefits derived are
available for all clients of the Adviser. Since statistical and other research
information is only supplementary to the research efforts of the Adviser and
still must be analyzed and reviewed by its staff, the receipt of research
information is not expected to materially reduce its expenses. In selecting
among the firms believed to meet the criteria for handling a particular
transaction, the Adviser may take into consideration that certain firms provide
market, statistical or other research information to the Funds and the Adviser,
and may select firms that are affiliated with the Funds, VKAC, its Adviser or
its distributor.
    
 
  If it is believed to be in the best interests of a Fund, the Adviser may place
portfolio transactions with brokers who provide the types of service described
above, even if it means the Fund will have to pay a higher commission, (or, if
the broker's profit is part of the cost of the security, will have to pay a
higher
 
                                      B-27
<PAGE>   47
 
price for the security) than would be the case if no weight were given to the
broker's furnishing of those services. This will be done, however, only if, in
the opinion of the Adviser, the amount of additional commission or increased
cost is reasonable in relation to the value of the services.
 
  If purchases or sales of securities of a Fund and of one or more other
investment companies or clients supervised by the Adviser are considered at or
about the same time, transactions in such securities will be allocated among the
several investment companies and clients in a manner deemed equitable to all by
the Adviser, taking into account the respective sizes of the accounts and the
amount of securities to be purchased or sold. Although it is possible that in
some cases this procedure could have a detrimental effect on the price or volume
of the security as far as a Fund is concerned, it is also possible that the
ability to participate in volume transactions and to negotiate lower brokerage
commissions will be beneficial to a Fund.
 
  Day to day management of the portfolios of each Fund is the responsibility of
the Adviser. While the Adviser will be primarily responsible for the placement
of the Funds' business, the policies and practices in this regard must be
consistent with the foregoing and will at all times be subject to review by the
Trustees.
 
  The Trustees have adopted certain policies incorporating the standards of Rule
17e-1 issued by the SEC under the 1940 Act which requires that the commissions
paid to Van Kampen American Capital Distributors, Inc. and other affiliates of a
Fund must be reasonable and fair compared to the commissions, fees or other
remuneration received or to be received by other brokers in connection with
comparable transactions involving similar securities during a comparable period
of time. The rule and procedures also contain review requirements and require
the Adviser to furnish reports to the Trustees and to maintain records in
connection with such reviews. After consideration of all factors deemed
relevant, the Trustees will consider from time to time whether the advisory fee
will be reduced by all or a portion of the brokerage commission given to
affiliated brokers.
 
  Each Fund placed brokerage transactions with brokers that were considered
affiliated persons of the Adviser such as Morgan Stanley Group Inc. The
negotiated commission paid to an affiliated broker on any transaction would be
comparable to that payable to a non-affiliated broker in a similar transaction.
 
   
  Neither Fund paid commissions to Morgan Stanley Group Inc. during the fiscal
period ended December 31, 1997 or 1996.
    
 
  State securities laws may differ from the interpretations of federal law
expressed herein.
 
                                    TAXATION
 
TAXATION OF THE FUNDS
 
   
  The following federal income tax discussion is based on the advice of Skadden,
Arps, Slate, Meagher & Flom (Illinois) and reflects applicable tax laws as of
the date of this Statement of Additional Information.
    
 
   
  Each Fund has elected and qualified and intends to continue to qualify each
year to be treated as a regulated investment company under the Internal Revenue
Code of 1986, as amended (the "Code"). To qualify as a regulated investment
company, each Fund must comply with certain requirements of the Code relating
to, among other things, the source of its income and the diversification of its
assets. If a Fund so qualifies and distributes to its shareholders at least 90%
of its net investment income (which includes net short-term capital gains, but
not net capital gains, which are the excess of net long-term
    
                                      B-28
<PAGE>   48
 
capital gains over net short-term capital losses) in each year, it will not be
required to pay federal income taxes on any income distributed to its
shareholders. Each Fund intends to distribute at least the minimum amount of net
investment income necessary to satisfy the 90% distribution requirement. Each
Fund will not be subject to federal income tax on any net capital gains
distributed to its shareholders.
 
   
  In order to avoid a 4% excise tax, a Fund will be required to distribute, by
December 31 of each year, at least 98% of its ordinary income (not including
tax-exempt income) for such year and at least 98% of its capital gain net income
determined in general on an October 31 year end, plus any amounts that were not
distributed in previous taxable years. For purposes of the excise tax, any
ordinary income or capital gain net income retained by, and subject to federal
income tax in the hands of, a Fund will be treated as having been distributed.
    
 
   
  If a Fund failed to qualify as a regulated investment company, the Fund would
be subject to tax on its income at corporate tax rates, without deduction for
any distribution to its shareholders, thereby materially reducing the amount of
any cash available for distribution to its shareholders. In addition, among
other things, capital gains of the Fund would not pass through to the
shareholders, and distributions to shareholders would be treated as dividends,
return of capital (to the extent of a shareholder's tax basis in its shares) or
gain derived from the sale or exchange of property. To qualify again as a
regulated investment company in a subsequent year, the Fund may be required to
pay an interest charge of 50% of its earnings and profits attributable to
non-regulated investment company years and would be required to distribute such
earnings and profits to shareholders (less any interest charge). In addition, if
the Fund failed to qualify as a regulated investment company for its first
taxable year or, if immediately after qualifying as a regulated investment
company for any taxable year, it failed to qualify for a period greater than one
taxable year, the Fund would be required to recognize any net built-in gains
(the excess of aggregate gains, including items of income, over aggregate losses
that would have been realized if it had been liquidated) in order to qualify as
a regulated investment company in a subsequent year.
    
 
   
  Some of the Funds' investment practices are subject to special provisions of
the Code that, among other things, may defer the use of certain losses of a Fund
and affect the holding period of the securities held by a Fund and the character
of the gains or losses realized by a Fund. These provisions may also require a
Fund to recognize income or gain without receiving the cash necessary to satisfy
the 90% distribution requirement and the distribution requirements for avoiding
federal income and excise taxes. Each Fund will monitor its transactions and may
make certain tax elections in order to mitigate the effect of these rules and
prevent disqualification of the Fund as a regulated investment company.
    
 
  Investments of a Fund in securities issued at a discount or providing for
deferred interest or payment of interest in kind are subject to special tax
rules that will affect the amount, timing and character of distributions to
shareholders. For example, with respect to securities issued at a discount, a
Fund will be required to accrue as income each year a portion of the discount
and to distribute such income each year in order to maintain its qualification
as a regulated investment company and to avoid income and excise taxes. In order
to generate sufficient cash to make distributions necessary to satisfy the 90%
distribution requirement and to avoid income and excise taxes, a Fund may have
to dispose of securities that it would otherwise have continued to hold.
 
                                      B-29
<PAGE>   49
 
   
TAXATION OF SHAREHOLDER DISTRIBUTIONS
    
 
   
  Distributions of a Fund's net investment income are taxable to shareholders as
ordinary income, whether paid in cash or shares. Shareholders who receive
distributions in the form of additional shares will have a basis for federal
income tax purposes in each share equal to the value thereof on the distribution
date. Distributions of a Fund's net capital gains ("capital gain dividends"), if
any, are taxable to a shareholder as long-term capital gains regardless of the
length of time the shares have been held by such holder. Distributions in excess
of a Fund's earnings and profits will first reduce the adjusted tax basis of a
holder's shares and, after such adjusted tax basis is reduced to zero, will
constitute capital gains to such holder (assuming such shares are held as a
capital asset). For a summary of the tax rates applicable to capital gains
(including capital gain dividends), see "Capital Gains Rates Under the 1997 Tax
Act" below. Tax-exempt shareholders not subject to federal income tax on their
income generally will not be taxed on distributions from the Fund.
    
 
  Although dividends generally will be treated as distributed when paid,
dividends declared in October, November or December, payable to shareholders of
record on a specified date in such a month and paid during January of the
following year, will be treated as having been distributed by a Fund and
received by the shareholders on December 31 of the year in which the dividend
was declared. In addition, certain other distributions made after the close of a
taxable year of a Fund may be "spilled back" and treated as having been paid by
the Fund (except for purposes of the 4% excise tax) during such taxable year. In
such case, shareholders will be treated as having received such dividends in the
taxable year in which the distribution is actually made.
 
   
  Distributions attributable to any dividend income earned by a Fund will be
eligible for the dividends received deduction for corporations if certain
requirements of the Code are satisfied. A Fund will be qualified to pay
exempt-interest dividends to its shareholders only if, at the close of each
quarter of the Fund's taxable year, at least 50% of the total value of the
Fund's assets consist of securities the interest on which is exempt from federal
income tax. However, neither Fund expects to invest a sufficient amount of its
assets in such securities so as to be qualified to pay exempt-interest
dividends.
    
 
  Each Fund will inform its shareholders of the source and tax status of all
distributions promptly after the close of each calendar year.
 
  Each Fund is required, in certain circumstances, to withhold 31% of ordinary
income and certain other payments, including redemptions, paid to shareholders
who do not furnish to the Fund their correct taxpayer identification numbers (in
the case of any individual, his or her social security number) together with
certain required certifications or who are otherwise subject to backup
withholding.
 
   
SALE OF SHARES
    
 
   
  The sale of shares (including transfers in connection with a redemption or
repurchase of shares) will be a taxable transaction for federal income tax
purposes. Selling shareholders will generally recognize gain or loss in an
amount equal to the difference between their adjusted tax basis in the shares
and the amount received. If such shares are held as a capital asset, the gain or
loss will be a capital gain or loss and will be long-term if such shares have
been held for more than one year. Any loss recognized upon a taxable disposition
of shares held for six months or less will be treated as a long-term capital
loss to the extent of any capital gain dividends received with respect to such
shares. For purposes of determining whether shares have been held for six months
or less, the holding period is suspended for any periods
    
 
                                      B-30
<PAGE>   50
 
during which the shareholder's risk of loss is diminished as a result of holding
one or more other positions in substantially similar or related property or
through certain options or short sales.
 
   
  CAPITAL GAINS RATES UNDER THE 1997 ACT.  Under the Taxpayer Relief Act of 1997
(the "1997 Tax Act"), the maximum tax rate applicable to net capital gains
recognized by individuals and other non-corporate taxpayers is (i) the same as
the maximum ordinary income tax rate for capital assets held for one year or
less, (ii) 28% for capital assets held for more than one year but not more than
18 months and (iii) 20% for capital assets held for more than 18 months. The
maximum net capital gains tax rate for corporations remains at 35%. The tax
rates for capital gains described above will apply to distributions of capital
gain dividends by the Fund (if, as expected, the Fund designates capital gain
dividends as 28% rate gain distributions or 20% rate gain distributions, in
accordance with its holding periods for the securities sold that generated such
capital gain dividends) as well as to sales and exchanges of shares in the Fund.
With respect to capital losses recognized on dispositions of shares held six
months or less where such losses are treated as long-term capital losses to the
extent of prior distributions of capital gain dividends received on such shares
(see "Sale of Shares" above), it is unclear how such capital losses offset the
capital gains referred to above. Shareholders should consult their own tax
advisers as to the application of the new capital gains rates to their
particular circumstances.
    
 
GENERAL
 
   
  The federal income tax discussion set forth above is for general information
only. Prospective investors should consult their own advisers regarding the
specific federal tax consequences of purchasing, holding and disposing of
shares, as well as the effects of state, local and foreign tax laws.
    
 
                                THE DISTRIBUTOR
 
   
  Shares of each Fund are offered on a continuous basis through Van Kampen
American Capital Distributors, Inc., One Parkview Plaza, Oakbrook Terrace, IL
60181. Van Kampen American Capital Distributors, Inc. is a wholly-owned
subsidiary of Van Kampen American Capital, Inc., which is an indirect
wholly-owned subsidiary of Morgan Stanley Dean Witter & Co.
    
 
  Pursuant to a distribution agreement, Van Kampen American Capital
Distributors, Inc. will purchase shares of the Funds for resale to the public,
and is obligated to purchase only those shares for which it has received
purchase orders. A discussion of how to purchase and redeem the Funds' shares
and how the Funds' shares are priced is contained in the Prospectus and below
under the captions "How to Buy Shares," "How to Sell Shares" and "Shareholder
Services."
 
                                 LEGAL COUNSEL
 
   
  Counsel to the Funds is Skadden, Arps, Slate, Meagher & Flom (Illinois)
Chicago, Illinois.
    
 
                            PERFORMANCE INFORMATION
 
  From time to time advertisements and other sales materials for the Funds may
include information concerning the historical performance of the Funds. Any such
information will include the average total return calculated on a compounded
basis for specified periods of time.
 
                                      B-31
<PAGE>   51
 
  Such advertisements and sales literature may also include a yield quotation,
which is determined on a daily basis with respect to the immediately preceding
30 day period; yield is computed by first dividing the Fund's net investment
income per share earned during such period by a Fund's maximum offering price
per share on the last day of such period. A Fund's net investment income per
share is determined by taking the interest attributable to shares earned by a
Fund during the period, subtracting the expenses attributable to shares accrued
for the period (net of any reimbursements), and dividing the result by the
average daily number of shares outstanding during the period that were entitled
to receive dividends. The yield calculation formula assumes net investment
income is earned and reinvested at a constant rate and annualized at the end of
a six month period. In each case, such total return and yield information, if
any, will be calculated pursuant to rules established by the SEC.
 
   
  In addition, the Funds may include in advertisements or other sales literature
information regarding the past performance of certain types of investments or
market indices. In lieu of or in addition to total return and yield
calculations, such information may include performance rankings and similar
information from independent organizations such as Lipper Analytical Services,
Inc., Business Week, Forbes or other industry publications. From time to time, a
Fund may compare its performance to certain securities and unmanaged indices
which may have different risk/reward characteristics than the Fund. Such
characteristics may include, but are not limited to, tax features, guarantees,
insurance and the fluctuation of principal or return. In addition, from time to
time, the Funds may utilize sales literature that includes hypotheticals.
    
 
  Each Fund calculates average compounded total return by determining the
redemption value at the end of specified periods (after adding back all
dividends and other distributions made during the period) of a $1,000 investment
in a given Fund at the beginning of the period, annualizing the increase or
decrease over the specified period with respect to such initial investment and
expressing the result as a percentage.
 
  Total return figures utilized by the Funds are based on historical performance
and are not intended to indicate future performance. Total return and net asset
value per share can be expected to fluctuate over time, and accordingly upon
redemption a shareholder's shares may be worth more or less than their original
cost.
 
  The Funds may, in supplemental sales literature, advertise non-standardized
total return figures representing the cumulative, non-annualized total return of
the Funds from a given date to a subsequent given date. Cumulative total return
is calculated by measuring the value of an initial investment in a given Fund at
a given time, determining the value of all subsequent reinvested distributions,
and dividing the net change in the value of the investment as of the end of the
period by the amount of the initial investment and expressing the result as a
percentage.
 
  From time to time, the Funds may include in sales literature and shareholder
reports a quotation of the current "distribution rate." Distribution rate is a
measure of the level of income and short-term capital gain dividends, if any,
distributed for a specified period. Distribution rate is determined by
annualizing the distributions per share for a stated period and dividing the
result by the public offering price for the same period. It differs from yield,
which is a measure of the income actually earned by a Fund's investments, and
from total return, which is a measure of the income actually earned by, plus the
effect of any realized and unrealized appreciation or depreciation of, such
investments during a stated period. Distribution rate is, therefore, not
intended to be a complete measure of a Fund's performance. Distribution rate may
sometimes be greater than yield since, for instance, it may not include the
effect of
 
                                      B-32
<PAGE>   52
 
amortization of bond premiums, and may include non-recurring short-term capital
gains and premiums from futures transactions engaged in by the Fund.
 
   
  The average annual total return for the Active Core Fund for (i) the one year
period ended December 31, 1997 was 8.93% and (ii) the approximately one year and
eight month period from April 23, 1996 (the commencement of investment
operations of the Fund) through December 31, 1997 was 8.39%. The cumulative
non-standardized total return from the Fund's inception to December 31, 1997 was
14.59%.
    
 
   
  The average annual total return for the Limited Duration Fund for (i) the one
year period ended December 31, 1997 was 6.29% and (ii) the approximately one
year and eight month period from April 23, 1996, (the commencement of investment
operations of the Fund) through December 31, 1997 was 6.19%. The cumulative
non-standardized total return from the Fund's inception to December 31, 1997 was
10.69%.
    
 
                               HOW TO BUY SHARES
 
  Shares of each Fund are offered at a price equal to net asset value per share,
without a sales charge. The minimum initial investment is $500,000. The minimum
subsequent investment is $25,000. The Funds offer their shares to the public on
a continuous basis through Van Kampen American Capital Distributors, Inc. (the
"Distributor"), as principal underwriter, which is located at One Parkview
Plaza, Oakbrook Terrace, Illinois 60181. The Distributor receives no
compensation for this service.
 
  In addition, investors may, subject to the approval of the Trust, purchase
shares of a Fund with liquid securities that are eligible for purchase by the
Fund (consistent with such Fund's investment policies and restrictions) and that
have a value that is readily ascertainable. These transactions will be effected
only if the Adviser intends to retain the securities in the Fund as an
investment. Assets so purchased by a Fund will be valued in the same manner as
they would be valued for purposes of pricing the Fund's shares, if such assets
were included in the Fund's assets at the time of purchase. The Trust reserves
the right to amend or terminate this practice with respect to any Fund at any
time without notice.
 
  OTHER PURCHASE INFORMATION. Purchases of a Fund's shares will be made in full
and fractional shares. In the interest of economy and convenience, certificates
for shares will generally not be issued.
 
  The Trust reserves the right, in its sole discretion and without prior notice,
to suspend the offering of shares of any Fund or to reject purchase orders when,
in the judgment of management, such suspension or rejection is in the best
interests of the Fund; to waive the minimum investment requirement for certain
investors; and to redeem shares if information provided in the Account
Application should prove to be incorrect in any material manner.
 
  Shares of the Trust may not be offered or sold in any state unless registered
or qualified in that jurisdiction or unless an exemption from registration or
qualification is available. The Funds are not registered or qualified for sale
in all jurisdictions. Potential investors should contact the Distributor at One
Parkview Plaza, Oakbrook Terrace, IL 60181 or call the Explorer Institutional
FundsSM at 1-800-822-3699 to determine whether a Fund is registered or qualified
for sale in their particular jurisdiction.
 
                                      B-33
<PAGE>   53
 
                               HOW TO SELL SHARES
 
  WRITTEN REDEMPTION REQUEST. Shareholders may sell shares without charge at any
time by mailing a written redemption request in proper form to the "Transfer
Agent" ACCESS Investor Services, Inc., P.O. Box 418256, Kansas City, MO
64141-9256 Re: Explorer Institutional FundsSM. The request should indicate the
number of shares to be redeemed of a particular Fund and identify the account
number and be signed exactly as the shares are registered. If the amount being
redeemed is in excess of $50,000 or if the redemption proceeds will be sent to
an address other than the address of record, the signature(s) must be guaranteed
by a member firm of a principal stock exchange, a commercial bank or trust
company which is a member of the Federal Deposit Insurance Corporation (the
"FDIC"), a credit union or a savings association. The guarantee must state the
words "Signature Guaranteed" along with the name of the granting institution.
Shareholders should verify with the institution that it is an eligible guarantor
prior to signing. A guarantee from a notary public is not acceptable. If
certificates are held for the shares being redeemed, such certificates must be
sent and endorsed for transfer or accompanied by an endorsed stock power. Share
certificates should be sent by registered mail to ACCESS Investor Services,
Inc., P.O. Box 418256, Kansas City, MO 64141-9256. Shareholders will receive the
net asset value per share next computed after the Transfer Agent receives the
redemption request and certificates (if any) in proper form.
 
  TELEPHONE REDEMPTIONS. Shareholders may sell shares without charge by calling
their Fund at 1-800-822-3699 before 4:00 p.m. Central time to request a
redemption. There is a $50,000 minimum per request if the redemption proceeds
are to be mailed to the shareholder or wired to a bank. Prior to redeeming
shares by telephone the "Expedited Telephone Redemption" section of either the
Account Application or Expedited Telephone Redemption and Exchange Request Form
(the "Authorization") must be completed by the shareholder and be on file with
the Transfer Agent. The signature(s) on the Authorization must be guaranteed by
a member firm of a principal stock exchange, a commercial bank or trust company
which is a member of the FDIC, a credit union or a savings association unless
the Authorization is completed at the time an account is originally established.
The guarantee must state the words "Signature Guaranteed" along with the name of
the granting institution. Shareholders should verify with the institution that
it is an eligible guarantor prior to signing. A guarantee from a notary public
is not acceptable. A redemption requested by telephone will be processed at the
net asset value next determined after the request is received. The proceeds
would then be made payable to the registered shareowner(s) and mailed to the
address registered on the account or wired to a bank, as requested on the
Authorization. Shareholders cannot redeem shares by telephone if certificates
are held for those shares. This service is not available with respect to shares
held in an Individual Retirement Account for which State Street Bank and Trust
Company acts as custodian. In addition, this service is not available with
respect to shares purchased by check until 15 days after purchase.
 
  By establishing the telephone redemption service, a shareholder authorizes,
the Trust, the Funds, the Distributor or ACCESS Investor Services, Inc.
("ACCESS") to act upon the instructions of any person by telephone to redeem
shares for any account for which such service has been authorized to the address
of record of such account or such other address as is listed in the
Authorization. The Funds, the Trust, the Distributor and ACCESS employ
procedures reasonably believed to confirm that instructions communicated by
telephone are genuine. Such procedures include requiring a person attempting to
redeem shares by telephone to provide, on a recorded line, the name on the
account, a social security number or tax identification number and such
additional information as may be included in the Authorization. An investor
agrees that no such person will be liable for any loss, liability, cost or
expense
 
                                      B-34
<PAGE>   54
 
arising out of any request, including any fraudulent or unauthorized request.
This service may be amended or terminated at any time by the Trust, the Funds,
the Distributor or ACCESS. If an investor is unable to reach a Fund by
telephone, he or she may redeem shares pursuant to the procedures set forth
above under the caption "Written Redemption Request." During periods of extreme
economic or market changes, it may be difficult for investors to reach the Fund
by telephone and to effect telephone redemptions.
 
  A Fund will not honor a request for redemption, whether in writing or by
telephone, until it has confirmed receipt of good funds with respect to the
purchase of such shares.
 
  GENERAL. When shares are redeemed by a Fund, a check for the proceeds (net of
any required tax withholding) ordinarily will be mailed to shareholders within
one business day after a redemption request or repurchase order and share
certificates (if any) are received in proper form as set forth above. Wire
transfers from a Fund of redemption proceeds, in the manner described above,
ordinarily will be transmitted to the shareholder within one business day. In
each case, the Trust reserves the right to take up to seven days to mail or wire
redemption proceeds. If any shares are redeemed or repurchased shortly after
purchase, a Fund will not mail the proceeds until checks received for the
purchase of shares have cleared, which may take 10 days or more. The proceeds,
of course, may be more or less than the cost of the shares.
 
  The right of redemption or resale to a Fund may be suspended or the date of
payment postponed during any period when the New York Stock Exchange is closed
(other than customary weekend and holiday closings), when an emergency exists as
defined by rules and regulations of the Securities and Exchange Commission, or
during any period when the Securities and Exchange Commission has by order
permitted such suspension or postponement.
 
  Due to the relatively high cost of maintaining small accounts, the Funds
reserve the right to redeem shares in any account for their then-current value
(which will be promptly paid to the investor) if at any time, due to redemption
by the investor, the shares in the account do not have a value of at least
$250,000. A shareholder will receive advance notice of a mandatory redemption
and will be given at least 30 days to bring the value of its account up to at
least $250,000.
 
  Neither the Trust, the Funds, the Distributor nor ACCESS will be liable for
any loss, cost or expense for acting on instructions (whether in writing or by
telephone) believed by the party receiving such instructions to be genuine and
in accordance with the procedures described in the Prospectus or this Statement
of Additional Information.
 
  The Trust agrees to redeem shares of each Fund solely in cash up to the lesser
of $2,000,000 or 1.00% of the respective Fund's net assets during any 90-day
period for any one shareholder. In consideration of the best interests of the
remaining shareholders of each Fund, the Trust reserves the right to pay any
redemption price exceeding this amount in whole or in part by a distribution in
kind of securities held by the respective Fund in lieu of cash. It is unlikely
that shares will be redeemed in kind. If shares are redeemed in kind, however,
the redeeming shareholder should expect to incur transaction costs upon the
disposition of the securities received in the distribution.
 
                                      B-35
<PAGE>   55
 
                              SHAREHOLDER SERVICES
 
  EXCHANGE PRIVILEGE.  Any shares of a Fund which have been registered in a
shareholder's name for at least 15 days may be exchanged for shares of any other
Fund of the Explorer Institutional FundsSM which are then available for sale.
Under the exchange privilege, the Funds offer to exchange their respective
shares on the basis of relative net asset value per share.
 
  In order to qualify for the exchange privilege, it is required that the shares
being exchanged have a net asset value of at least $250,000 (unless prior
approval has been obtained from the Trust). Shareholders will be able to effect
an exchange by telephone by calling a Fund at 1-800-822-3699 prior to 4:00 p.m.
Central Standard time and requesting the exchange. The exchange will be
processed at the net asset values of the respective Fund next determined after
receipt of such request. By utilizing the telephone exchange service, a
shareholder authorizes the Trust or ACCESS to act upon the instructions of any
person by telephone to exchange shares from any account of a Fund for which such
service has been authorized to any identically registered account(s) with any
other Fund. The Funds, the Trust, the Distributor and ACCESS employ procedures
reasonably believed to confirm that instructions communicated by telephone are
genuine. Such procedures include requiring a person attempting to exchange
shares by telephone to provide, on a recorded line, the name on the account, a
social security or tax identification number and such additional information as
may be necessary or appropriate. An investor agrees that no such person will be
liable for any loss, liability, cost or expense arising out of any request,
including any fraudulent or unauthorized request. This service may be amended or
terminated at any time by ACCESS or the Trust. If a shareholder has certificates
for any shares being exchanged, such certificates must be surrendered prior to
the exchange in the same manner as in redemption of such shares. See "How to
Sell Shares--Telephone Redemptions." Any shares exchanged between a Fund and any
of the other Funds will begin earning dividends on the next business day after
the exchange is effected. Before effecting an exchange, shareholders in a Fund
should obtain and read a current prospectus of the Fund into which the exchange
is to be made. SHAREHOLDERS MAY ONLY EXCHANGE INTO SUCH OTHER FUNDS AS ARE
LEGALLY AVAILABLE FOR SALE IN THEIR STATE.
 
  An exchange between Funds pursuant to the exchange privilege is treated as a
sale for federal income tax purposes and, depending upon the circumstances, a
short- or long-term capital gain or loss may be realized.
 
  The exchange privilege may be modified or terminated at any time, subject to
the requirement that the Funds give prominent notice thereof at least 60 days
prior to the effective date of the modification or termination in certain
circumstances. The Funds reserve the right to limit the number of times a
shareholder may exercise the exchange privilege.
 
   
                   INSTRUCTIONS REGARDING BACKUP WITHHOLDING
    
 
  You may be, or may have been, notified that you are subject to backup
withholding under section 3406(a)(1)(C) of the Internal Revenue Code of 1986, as
amended (the "Code"), because you have under-reported interest or dividends or
you were required to but failed to file a return which would have included a
reportable interest or dividend payment. IF YOU HAVE BEEN SO NOTIFIED AND YOU
HAVE NOT RECEIVED A SUBSEQUENT NOTICE FROM THE INTERNAL REVENUE SERVICE ADVISING
YOU THAT BACKUP WITHHOLDING HAS BEEN TERMINATED, YOU MUST STRIKE OUT THE
LANGUAGE ON THIS APPLICATION FORM CERTIFYING THAT YOU ARE NOT SUBJECT TO BACKUP
WITHHOLDING.
                                      B-36
<PAGE>   56
 
  Caution: There are other situations where you may be subject to backup
withholding. Please read these instructions carefully.
 
BACKUP WITHHOLDING
 
  The Fund must generally withhold 31% of taxable interest, dividend, and
certain other payments if you are subject to backup withholding. You are subject
to backup withholding if:
 
          (1) You fail to furnish your taxpayer identification number to the
     Fund, OR
 
          (2) The Internal Revenue Service notifies the Fund that you furnished
     an incorrect taxpayer identification number, OR
 
        (3) You are notified that you are subject to backup withholding (under
     section 3406(a)(1)(C) of the Code), OR
 
          (4) You fail to certify to the Fund that you are not subject to backup
     withholding under (3) above, or fail to certify your taxpayer
     identification number.
 
  To prevent backup withholding on these payments be sure to notify the Fund of
your correct taxpayer identification number and properly certify that you are
not subject to backup withholding under section 3406(a)(1)(C) of the Code. You
should use this application form for this purpose.
 
  If you are subject to backup withholding and you strike out the language on
this application form certifying that you are not subject to backup withholding,
you should nonetheless provide your correct taxpayer identification number to
the Fund and certify that it is correct.
 
TAXPAYER IDENTIFICATION NUMBER
 
  The taxpayer identification number is the social security number or employer
identification number of the record owner of the account. If the account belongs
to you as an individual, give your social security number. If you have any
questions about what number to provide, contact the Transfer Agent at the
address or telephone number set forth at the top of this application form.
 
  Certain entities and certain payments are exempted from backup withholding. If
you think you may be exempt, contact the Transfer Agent at the address or
telephone number set forth at the top of this application form.
 
  If you do not have a taxpayer identification number or you do not know your
number, obtain Form SS-5, Application for a Social Security Number Card, or Form
SS-4, Application for Employer Identification Number, at the local office of the
Social Security Administration or the Internal Revenue Service and apply for a
number. Write "applied for" in place of your number. When you get a number,
submit a new application form to the Fund. If you do not provide your taxpayer
identification number to the Fund within 60 days, backup withholding will begin
and continue until you furnish your taxpayer identification number to the Fund.
 
  You may be subject to penalties if you fail to furnish your taxpayer
identification number, provide false information or falsify information with
respect to backup withholding.
 
                                      B-37
<PAGE>   57
'                      REPORT OF INDEPENDENT ACCOUNTANTS


The Board of Trustees and Shareholders of
The Explorer Institutional Trust:

We have audited the accompanying statements of assets and liabilities of The
Explorer Institutional Trust (comprising the Active Core Fund and Limited
Duration Fund, collectively referred to as the "Funds"), including the
portfolios of investments, as of December 31, 1997, the related statements of
operations for the year then ended, the statements of changes in net assets and 
financial highlights for the year then ended and for the period from April 23,
1996 (commencement of investment operations) through December 31, 1996. These   
financial statements and financial highlights are the responsibility of the
Funds' management. Our responsibility is to express an opinion on these
financial statements and financial highlights based on our audits.
        
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about  whether the financial statements and financial
highlights are free of material misstatement.  An audit includes examining, on
a test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned as of
December 31, 1997, by correspondence with the custodian. An audit also
includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.
        
In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of each
of the respective funds constituting The Explorer Institutional Trust as of
December 31, 1997, the results of their operations for the year then ended, and
the changes in their net assets and financial highlights for the year then
ended and for the period from April 23, 1996 (commencement of investment
operations) through December 31, 1996, in conformity with generally accepted
accounting principles.  
        
                                        KPMG Peat Marwick LLP

Chicago, Illinois
February 10, 1998


                                      B-38

<PAGE>   58
                    EXPLORER INSTITUTIONAL ACTIVE CORE FUND

                           PORTFOLIO OF INVESTMENTS

                               December 31, 1997
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
  Par
 Amount
 (000)                  Description                                     Coupon             Maturity   Market Value
- ------------------------------------------------------------------------------------------------------------------
<C>     <S>                                                             <C>                <C>        <C>       
        ASSET-BACKED SECURITIES 5.1%                                                                              
$    75 American Express Credit Account Master Trust.................    6.400 %            04/15/05    $ 75,636  
    125 Citibank Credit Card Master Trust............................        *              02/07/03     103,466  
     75 Household Affinity Credit Card Master Trust..................    5.600              05/15/02      74,098  
                                                                                                      ----------  
        TOTAL ASSET-BACKED SECURITIES................................                                    253,200  
                                                                                                      ----------  
        CORPORATE BONDS 26.2%                                                                                     
        Aerospace/Defense 0.8%                                                                                    
     40 McDonnell Douglas Corp.......................................    6.875              11/01/06      41,469  
                                                                                                      ----------  
        CONSUMER DISTRIBUTION 3.7%                                                                                
    100 Wal Mart Stores, Inc.........................................    5.500              03/01/98      99,902  
     80 Wal Mart Stores, Inc.........................................    8.625              04/01/01      85,686  
                                                                                                      ----------  
                                                                                                         185,588  
                                                                                                      ----------  
        CONSUMER DURABLES 2.1%                                                                                    
    100 Polaroid Corp................................................    6.750              01/15/02     101,029  
                                                                                                      ----------  
        CONSUMER SERVICES 3.6%                                                                                    
     75 Hertz Corp...................................................    7.000              07/01/04      76,547  
    100 Walt Disney Co...............................................    6.750              03/30/06     103,210  
                                                                                                      ----------  
                                                                                                         179,757  
                                                                                                      ----------  
        FINANCE 6.7%                                                                                              
    100 American Express Credit Corp.................................    6.500              08/01/00     100,845  
    100 Commercial Credit Group, Inc.................................    6.625              11/15/06     101,000  
    125 BancOne Corp.................................................    7.000              03/25/02     128,196  
                                                                                                      ----------  
                                                                                                         330,041  
                                                                                                      ----------  
        RAW MATERIALS/PROCESSING INDUSTRIES 3.7%                                                                  
     75 Du Pont (E.I.) de Nemours & Co...............................    6.750              09/01/07      77,604  
    100 Union Pacific Resources Group, Inc...........................    7.000              10/15/06     102,728  
                                                                                                      ----------  
                                                                                                         180,332  
                                                                                                      ----------  
        TELECOMMUNICATIONS 2.2%                                                                                   
    100 AT&T Corp....................................................    7.750              03/01/07     109,640  
                                                                                                      ----------  
                                                                                                                  
        UTILITIES 3.4%                                                                                            
     15 Florida Power & Light Co.....................................    7.050              12/01/26      15,043  
    100 Pacific Gas & Electric Co....................................    6.250              08/01/03     100,270  
     50 Wisconsin Electric Power Co..................................    6.625              11/15/06      51,107  
                                                                                                      ----------  
                                                                                                         166,420  
                                                                                                      ----------  
        TOTAL CORPORATE BONDS                                                                          1,294,276  
                                                                                                      ----------  
        UNITED STATES GOVERNMENT AGENCY OBLIGATIONS 57.2%
    165 Federal Home Loan Mortgage Corp..............................    5.630              01/10/03     162,674
    142 Federal Home Loan Mortgage Corp. Gold Pool #G00559...........    7.000              10/01/26     142,807
     76 Federal Home Loan Mortgage Corp. Gold Convertible 15 Year
             Pool #G10270............................................    8.500              09/01/09      79,854
     90 Federal Home Loan Mortgage Corp. Gold Convertible 15 Year
             Pool #G10592............................................    6.500              09/01/11      90,034
     26 Federal National Mortgage Association Dwarf 15 Year
             Pool #250589............................................    7.000              06/01/11      26,076
     45 Federal National Mortgage Association Dwarf 15 Year
             Pool #250649............................................    6.500              08/01/11      45,101
    100 Federal National Mortgage Association Medium Term Note.......    5.280              03/01/99      99,426
    270 Federal National Mortgage Association Medium Term Note.......    6.060              06/21/99     270,980
     80 Federal National Mortgage Association Medium Term Note.......    6.800              04/08/02      82,528
    100 Federal National Mortgage Association Medium Term Note.......    6.520              07/11/07     103,246
</TABLE>



                                               See Notes to Financial Statements

                                      B-39

<PAGE>   59


                    EXPLORER INSTITUTIONAL ACTIVE CORE FUND

                            PORTFOLIO OF INVESTMENTS

                               December 31, 1997
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
  Par
 Amount
 (000)                 Description                              Coupon                 Maturity  Market Value
- -------------------------------------------------------------------------------------------------------------
        UNITED STATES GOVERNMENT AGENCY OBLIGATIONS (CONTINUED)
<S>     <C>                                                          <C>     <C>                   <C>
$   100 Federal National Mortgage Association PAC.................   7.000 %             10/25/09  $  102,438
    170 Federal National Mortgage Association PAC.................   6.500               04/18/20     171,108
    132 Federal National Mortgage Association Pool #124561........   7.500               11/01/22     134,714
    192 Federal National Mortgage Association Pool #313047........   8.500               12/01/25     200,805
    123 Federal National Mortgage Association Pool #303828........   6.500               04/01/26     121,396
    143 Federal National Mortgage Association Pool #250569........   6.000               05/01/26     137,915
    139 Federal National Mortgage Association Pool #358471........   7.000               10/01/26     140,473
    122 Government National Mortgage Association Platinum
             Pool #780440.........................................   8.500               11/15/17     131,078
     83 Government National Mortgage Association Platinum 15 Year
             Pool #780419.........................................   7.500               12/15/09      86,023
     74 Government National Mortgage Association Pool #780157.....   9.500               08/15/22      80,883
    266 Government National Mortgage Association Pools............   6.500   04/15/26 to 02/15/27     263,081
    150 Tennessee Valley Authority................................   6.375               06/15/05     152,684
                                                                                                   ----------
        TOTAL UNITED STATES GOVERNMENT AGENCY OBLIGATIONS........................................   2,825,324
                                                                                                   ----------


        UNITED STATES TREASURY OBLIGATIONS 8.7%
    125 United States Treasury Bonds..............................   8.125               08/15/19     156,465
    600 United States Treasury STRIPS (a).........................       *   02/15/07 to 05/15/15     270,588
                                                                                                   ----------
        TOTAL UNITED STATES TREASURY OBLIGATIONS.................................................     427,053
                                                                                                   ----------
                                                                                 
TOTAL INVESTMENTS 97.2%
  (Cost $4,646,616)..............................................................................   4,799,853 
                                                                                   
OTHER ASSETS IN EXCESS OF LIABILITIES 2.8%.......................................................     138,420
                                                                                                   ----------
NET ASSETS 100.0%................................................................................  $4,938,273
                                                                                                   ==========
</TABLE>

* Zero coupon bond

(a) U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal
    of Securities) are securities issued by the U.S. Treasury Department which
    evidence ownership in either the bond principal or interest payments.  These
    securities are used by the Fund to manage the portfolio's duration
        
        
The following table summarizes the portfolio composition at December 31, 1997,
based upon the higher of the quality rating issued by Standard & Poor's or
Moody's.


<TABLE>
<S>                                                            <C>
        PORTFOLIO COMPOSITION BY CREDIT QUALITY **

        U.S. Government and Government Agency Obligations......  67.8%
        AAA....................................................   5.2
        AA.....................................................  16.9
        A......................................................   8.0
        BBB....................................................   2.1
                                                                -----
                                                                100.0%
                                                                =====
        ** AS A PERCENTAGE OF LONG-TERM ASSETS
</TABLE>

                                               See Notes to Financial Statements


                                      B-40

<PAGE>   60
                   EXPLORER INSTITUTIONAL ACTIVE CORE FUND
                                      
                      STATEMENT OF ASSETS AND LIABILITIES

                              December 31, 1997
- --------------------------------------------------------------------------------

<TABLE>
<S>                                                                      <C>                           
ASSETS:                                                                                                
Total Investments (Cost $4,646,616)..................................    $4,799,853                    
Cash.................................................................        79,676                    
Interest Receivable..................................................        51,634                    
Unamortized Organizational Costs.....................................        31,865                    
                                                                         ----------                    
    Total Assets.....................................................     4,963,028                    
                                                                         ----------                    
LIABILITIES:                                                                                           
Accrued Expenses.....................................................        14,366                    
Trustees' Deferred Compensation and Retirement Plans.................         9,311                    
Income and Capital Gain Distributions Payable........................         1,078                    
                                                                         ----------                    
    Total Liabilities................................................        24,755                    
                                                                         ----------                    
NET ASSETS...........................................................    $4,938,273                    
                                                                         ==========                    
NET ASSETS CONSIST OF:                                                                                 
Capital..............................................................     4,763,330                    
Net Unrealized Appreciation..........................................       153,237                    
Accumulated Net Realized Gain........................................        25,304                    
Accumulated Distributions in Excess of Net Investment Income.........        (3,598)                   
                                                                         ----------                    
NET ASSETS...........................................................    $4,938,273                    
                                                                         ==========                    
NET ASSET VALUE PER SHARE (Based on net assets of $4,938,273 and 
  485,509 shares of beneficial interest issued and outstanding)......    $    10.17                    
                                                                         ==========                    
</TABLE>

                                            

                                         See Note to Financial Statements

                                      B-41

<PAGE>   61
                    EXPLORER INSTITUTIONAL ACTIVE CORE FUND

                            STATEMENT OF OPERATIONS

                      For the Year Ended December 31, 1997
- --------------------------------------------------------------------------------

<TABLE>
<S>                                                         <C>
INVESTMENT INCOME:
Interest.................................................   $ 412,409
                                                            ---------
EXPENSES:
Shareholder Services.....................................      19,235
Investment Advisory Fee..................................      18,786
Legal....................................................      18,439
Audit....................................................      17,476
Trustees' Fees and Expenses..............................      14,043
Custody..................................................      12,346
Amortization of Organizational Costs.....................      10,484
Accounting...............................................       9,754
Registration and Filing Fees.............................       3,600
Shareholder Reports......................................       1,000
Other....................................................         363
                                                            ---------
  Total Expenses                                              125,526
  Less: Fees Waived and Expenses Reimbursed ($18,786 
           and $69,355, respectively)....................      88,141
        Credits Earned on Cash Balances..................      12,346
                                                            ---------
  Net Expenses...........................................      25,039
                                                            ---------
NET INVESTMENT INCOME....................................   $ 387,370
                                                            =========
REALIZED AND UNREALIZED GAIN/LOSS:
  Net Realized Gain......................................   $  97,464
                                                            ---------
Unrealized Appreciation/Depreciation:
  Beginning of the Period................................      81,464
  End of the Period......................................     153,237
                                                            ---------
Net Unrealized Appreciation During the Period............      71,773
                                                            ---------
NET REALIZED AND UNREALIZED GAIN.........................   $ 169,237
                                                            =========
NET INCREASE IN NET ASSETS FROM OPERATIONS...............   $ 556,607
</TABLE>                                                    =========


                                          See Notes to Financial Statements

                                      B-42

<PAGE>   62
                  EXPLORER INSTITUTIONAL ACTIVE CORE FUND

                     STATEMENT OF CHANGES IN NET ASSETS

      For the Year Ended December 31, 1997 and the Period April 23, 1996
         (Commencement of Investment Operations) to December 31, 1996
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                   Year Ended         Period Ended    
                                                                               December 31, 1997    December 31, 1996
- ----------------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>                  <C>                    
FROM INVESTMENT ACTIVITIES:                                                                                                 
Operations:                                                                                                                 
Net Investment Income......................................................      $      387,370      $         208,898      
Net Realized Gain..........................................................              97,464                  6,691      
Net Unrealized Appreciation During the Period..............................              71,773                 81,464      
                                                                                 --------------      -----------------      
Change in Net Assets from Operations.......................................             556,607                297,053      
                                                                                 --------------      -----------------      
                                                                                                                            
Distributions from Net Investment Income...................................            (387,370)              (208,862)     
Distributions in Excess of Net Investment Income...........................                 (29)                   -0-      
Distributions from Net Realized Gain.......................................             (77,231)                (5,225)     
                                                                                 --------------      -----------------      
Total Distributions........................................................            (464,630)              (214,087)     
                                                                                 --------------      -----------------      
                                                                                                                            
NET CHANGE IN NET ASSETS FROM INVESTMENT ACTIVITIES........................              91,977                 82,966      
                                                                                 --------------      -----------------      
                                                                                                                            
FROM CAPITAL TRANSACTIONS:                                                                                                  
                                                                                                                            
Proceeds from Shares Sold..................................................           1,850,000              6,748,576      
Net Asset Value of Shares Issued Through Dividend Reinvestment.............             451,896                149,654      
Cost of Shares Repurchased.................................................          (3,095,946)            (1,390,850)     
                                                                                 --------------      -----------------      
                                                                                                                            
NET CHANGE IN NET ASSETS FROM CAPITAL TRANSACTIONS.........................            (794,050)             5,507,380      
                                                                                 --------------      -----------------      
                                                                                                                            
TOTAL INCREASE/DECREASE IN NET ASSETS......................................            (702,073)             5,590,346      
                                                                                                                            
NET ASSETS:                                                                                                                 
Beginning of the Period....................................................           5,640,346                 50,000      
                                                                                 --------------      -----------------      
                                                                                                                            
End of the Period (Including accumulated distributions in excess                                                            
  of net investment income of $3,598 and $537, respectively)...............      $    4,938,273      $       5,640,346      
                                                                                 ==============      =================      
</TABLE>


                                               See Notes to Financial Statements

                                      B-43

<PAGE>   63
                  EXPLORER INSTITUTIONAL ACTIVE CORE FUND


                            FINANCIAL HIGHLIGHTS

       The following schedule presents financial highlights for one share
           of the Fund outstanding throughout the periods indicated.
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                               April 23, 1996
                                                                                Year            (Commencement
                                                                                Ended           of Investment
                                                                            December 31,       Operations) to
                                                                                1997        December 31, 1996
- -------------------------------------------------------------------------------------------------------------
<S>                                                                          <C>             <C>
Net Asset Value, Beginning of the Period.................................    $    10.085      $        10.000   
                                                                             -----------      ---------------
Net Investment Income....................................................          0.626                0.409   
Net Realized and Unrealized Gain.........................................          0.249                0.095   
                                                                             -----------      ---------------
                                                                                                                
Total from Investment Operations.........................................          0.875                0.504   
                                                                             -----------      ---------------
                                                                                                                
Less:                                                                                                           
  Distributions from and in Excess of Net Investment Income..............          0.626                0.409   
  Distributions from Net Realized Gain...................................          0.163                0.010   
                                                                             -----------      ---------------
Total Distributions......................................................          0.789                0.419   
                                                                             -----------      ---------------
                                                                                                                
Net Asset Value, End of the Period.......................................    $    10.171      $        10.085   
                                                                             ===========      ===============
                                                                                                                
                                                                                                                
                                                                                                                
Total Return *...........................................................           8.93%                5.20%**
                                                                                                                
Net Assets at End of the Period (In millions)............................           $4.9                 $5.6   
                                                                                                                
Ratio of Expenses to Average Net Assets* (a).............................           0.60%                0.40%  
                                                                                                                
Ratio of Net Investment Income to Average Net Assets*....................           6.19%                5.98%  
                                                                                                                
Portfolio Turnover.......................................................            109%                  84%**

* If certain expenses had not been assumed by VKAC, Total Return would 
   have been lower and the ratios would have been as follows:

Ratio of Expenses to Average Net Assets (a)..............................           2.01%                1.81%
                                                                                                              
Ratio of Net Investment Income to Average Net Assets.....................           4.78%                4.57%

</TABLE>
** Non-Annualized


(a)  The Ratios of Expenses to Average Net Assets do not reflect credits earned
     on overnight cash balances.  If these credits were reflected as a reduction
     of expenses, the ratios would decrease by .20% for the period ended
     December 31, 1997.



                                              See Notes to Financial Statements
 
                                      B-44

<PAGE>   64
                 EXPLORER INSTITUTIONAL LIMITED DURATION FUND

                           PORTFOLIO OF INVESTMENTS

                               December 31, 1997
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
  Par
 Amount
 (000)                 Description                                 Coupon                     Maturity              Market Value
- --------------------------------------------------------------------------------------------------------------------------------
<S>    <C>                                                        <C>             <C>                               <C>         
       ASSET-BACKED SECURITIES  2.0%                                                                       
$   30 American Express Credit Account Master Trust.............   6.400 %                    04/15/05              $     30,254
   125 Citibank Credit Card Master Trust........................       *                      02/07/03                   103,466
    30 Household Affinity Credit Card Master Trust..............   5.600                      05/15/02                    29,639
                                                                                                                    ------------
       TOTAL ASSET-BACKED SECURITIES............................                                                         163,359
                                                                                                                    ------------
                                                                                                                                
       CORPORATE BONDS 11.3%                                                                                                    
       CONSUMER DISTRIBUTION 2.4%                                                                                               
   200 Wal-Mart Stores, Inc.....................................   5.500                      03/01/98                   199,804
                                                                                                                    ------------
                                                                                                                                
       FINANCE 4.6%                                                                                                             
   150 American Express Credit Corp.............................   6.500                      08/01/00                   151,268
   175 Ford Motor Credit Co.....................................   5.750                      01/25/01                   172,578
    50 Sears Roebuck Acceptance Corp............................   7.000                      06/15/07                    51,765
                                                                                                                    ------------
                                                                                                                         375,611
                                                                                                                    ------------
                                                                                                                                 
       RAW MATERIALS/PROCESSING INDUSTRIES 1.8%                                                                                 
   150 Du Pont (E.I.) de Nemours & Co...........................   6.750                      10/15/02                   152,904
                                                                                                                    ------------
                                                                                                                                
       TECHNOLOGY 1.9%                                                                                                          
   150 Lucent Technologies, Inc.................................   6.900                      07/15/01                   153,881
                                                                                                                    ------------
                                                                                                                               
       UTILITIEs 0.6%                                                                                                           
    50 Pacific Gas & Electric Co................................   6.250                      08/01/03                    50,135
                                                                                                                    ------------
                                                                                                                               
       TOTAL CORPORATE BONDS....................................                                                         932,335
                                                                                                                    ------------
                                                                                                                                
       UNITED STATES GOVERNMENT AGENCY OBLIGATIONS 18.2%                                                                        
   100 Federal Home Loan Bank...................................   5.905                      12/23/02                    99,980
   500 Federal Home Loan Mortgage Corp..........................   5.630                      01/10/03                   492,950
    44 Federal Home Loan Mortgage Corp. Gold 30 Year Pools......   7.000          10/01/26 to 11/01/27                    44,223
    12 Federal Home Loan Mortgage Corp. Gold Convertible                                                                       
       15 Year Pool #G10270.....................................   8.500                      09/01/09                    12,026
    26 Federal National Mortgage Association Dwarf 15 Year                                                                      
       Pool # 250589............................................   7.000                      06/01/11                    26,076
    90 Federal National Mortgage Association Dwarf 15 Year                                                                      
       Pool # 250649............................................   6.500                      08/01/11                    90,202
    60 Federal National Mortgage Association PAC................   6.500                      04/18/20                    60,391
    49 Federal National Mortgage Association Pool #303828.......   6.500                      04/01/26                    48,558
    22 Federal National Mortgage Association Pool #124561.......   7.500                      11/01/22                    22,452
   100 Federal National Mortgage Association Medium Term Note...   5.280                      03/01/99                    99,426
   150 Federal National Mortgage Association Medium Term Note...   6.060                      06/21/99                   150,545
    30 Federal National Mortgage Association Medium Term Note...   6.800                      04/08/02                    30,948
    12 Government National Mortgage Association Platinum                                                                       
       15 Year Pool #780419.....................................   7.500                      12/15/09                    12,650
    16 Government National Mortgage Association Platinum                                                                      
       Pool #780440.............................................   8.500                      11/15/17                    17,361
   290 Tennessee Valley Authority...............................   6.375                      06/15/05                   295,188
                                                                                                                    ------------
       TOTAL UNITED STATES GOVERNMENT AGENCY OBLIGATIONS........                                                       1,502,976
                                                                                                                    ------------
</TABLE>


                                             See Notes to Financial Statements

                                      B-45

<PAGE>   65
                 EXPLORER INSTITUTIONAL LIMITED DURATION FUND

                           PORTFOLIO OF INVESTMENTS
                               DECEMBER 31, 1997




<TABLE>
<CAPTION>
PAR
AMOUNT
(000)  DESCRIPTION                                           COUPON                          MATURITY               MARKET VALUE
- --------------------------------------------------------------------------------------------------------------------------------
<S>    <C>                                                   <C>                           <C>                      <C>         
       UNITED STATES TREASURY OBLIGATIONS 49.3%                                                                                    
$  500 United States Treasury Notes ........................  4.750 %                        08/31/98               $    497,110
 1,925 United States Treasury Notes ........................  5.125              02/28/98 to 11/30/98                  1,920,175
   700 United States Treasury Notes ........................  5.875              04/30/98 to 11/30/01                    701,368
   555 United States Treasury Notes ........................  6.000                          08/15/00                    559,074
   275 United States Treasury Notes ........................  6.250                          08/31/00                    278,652
   130 United States Treasury STRIPS (a) ...................      *                          08/15/02                     99,683
                                                                                                                    ------------
       TOTAL UNITED STATES TREASURY OBLIGATIONS .............................................................          4,056,062
                                                                                                                    ------------
TOTAL LONG-TERM INVESTMENTS  80.8%                                                                                              
(Cost $6,575,728) ...........................................................................................          6,654,732
                                                                                                                    ------------
SHORT-TERM INVESTMENTS 18.2%
Federal Home Loan Mortgage Corp. Discount Note ($105,000 par, yielding 5.75%, 01/02/98 maturity) ............            104,966
Federal National Mortgage Association Discount Note ($500,000 par, yielding 5.55%, 01/26/98 maturity) .......            496,277
Federal National Mortgage Association Discount Note ($900,000 par, yielding 5.73%, 02/18/98 maturity) .......            896,295
                                                                                                                    ------------
TOTAL SHORT-TERM INVESTMENTS
(Cost $1,497,538) ...........................................................................................          1,497,538
TOTAL INVESTMENTS 99.0%
(Cost $8,073,266) ...........................................................................................          8,152,270
OTHER ASSETS IN EXCESS OF LIABILITIES   1.0% ................................................................             79,816
                                                                                                                    ------------

NET ASSETS    100.0% ........................................................................................       $  8,232,086
                                                                                                                    ============
</TABLE>

*Zero coupon bond

(a)  U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal
     of Securities) are securities issued by the U.S. Treasury Department which
     evidence ownership in either the bond principal or interest payments. 
     These securities are used by the Fund to manage the portfolio's duration.
        

The following table summarizes the portfolio composition at December 31, 1997,
based on the higher of the quality ratings issued by Standard & Poor's or
Moody's.

<TABLE>
<CAPTION>
         PORTFOLIO COMPOSITION BY CREDIT QUALITY **
         <S>                                                    <C>
         U.S. Government and Government Agency Obligations ....  83.5% 
         AAA ..................................................   2.5
         AA ...................................................   5.3
         A ....................................................   8.7
                                                                ----- 
                                                                100.0% 
                                                                ===== 
         ** AS A PERCENTAGE OF LONG-TERM ASSETS
</TABLE> 


                                              See Notes to Financial Statements
                                     B-46

<PAGE>   66
                EXPLORER INSTITUTIONAL LIMITED DURATION FUND

                     STATEMENT OF ASSETS AND LIABILITIES

                              December 31, 1997
- --------------------------------------------------------------------------------

<TABLE>
<S>                                                                                      <C>           
ASSETS:                                                                                                
  Total Investments (Cost $8,073,266) .................................................  $   8,152,270 
  Cash ................................................................................            570 
  Interest Receivable .................................................................         88,125 
  Unamortized Organizational Expenses .................................................         32,533 
                                                                                          ------------ 
      Total Assets                                                                           8,273,498 
                                                                                          ------------ 
LIABILITIES:                                                                                           
  Accrued Expenses ....................................................................         31,768 
  Trustees' Deferred Compensation and Retirement Plans ................................          9,311 
  Income and Capital Gains Distributions Payable ......................................            333 
                                                                                          ------------ 
      Total Liabilities ...............................................................         41,412 
                                                                                          ------------ 
NET ASSETS ............................................................................  $   8,232,086 
                                                                                          ============ 
NET ASSETS CONSIST OF:                                                                                 
  Capital .............................................................................  $   8,154,623 
  Net Unrealized Appreciation .........................................................         79,004 
  Accumulated Distributions in Excess of Net Investment Income ........................         (1,541)
                                                                                          ------------ 
NET ASSETS ............................................................................  $   8,232,086 
                                                                                          ============ 
Net Asset Value Per Share (Based on net assets of $8,232,086 and 820,195 shares of
beneficial interest issued and outstanding) ...........................................  $       10.04
                                                                                          ============ 
</TABLE>


                                               See Notes to Financial Statements

                                     B-47

<PAGE>   67
                EXPLORER INSTITUTIONAL LIMITED DURATION FUND

                           STATEMENT OF OPERATIONS

                      For the Year Ended December 31, 1997
- --------------------------------------------------------------------------------

<TABLE>
<S>                                                            <C>
INVESTMENT INCOME:
Interest....................................................   $    504,464
                                                               ------------

EXPENSES:
Investment Advisory Fee.....................................         24,651
Legal.......................................................         22,091
Shareholder Services........................................         18,677
Audit.......................................................         17,601
Trustees' Fees and Expenses.................................         14,043
Custody.....................................................         12,978
Amortization of Organizational Costs........................         10,775
Accounting..................................................         10,124
Printing....................................................          5,682
Registration and Filing Fees................................          3,000
Other.......................................................            250
                                                               ------------

  Total Expenses............................................        139,872
  Less:  Fees Waived and Expenses Reimbursed  ($24,651 and
            $69,356, respectively)..........................         94,007
         Credits Earned on Cash Balances....................         12,978
                                                               ------------

  Net Expenses..............................................         32,887
                                                               ------------

NET INVESTMENT INCOME.......................................   $    471,577
                                                               ============

REALIZED AND UNREALIZED GAIN/LOSS:
Net Realized Gain...........................................   $     25,119
                                                               ------------

Unrealized Appreciation/Depreciation:
  Beginning of the Period...................................         78,132
  End of the Period.........................................         79,004
                                                               ------------

Net Unrealized Appreciation During the Period...............            872
                                                               ------------
NET REALIZED AND UNREALIZED GAIN............................   $     25,991
                                                               ============
NET INCREASE IN NET ASSETS FROM OPERATIONS..................   $    497,568
                                                               ============
</TABLE>




                                          See Notes to Financial Statements

                                     B-48

<PAGE>   68
                EXPLORER INSTITUTIONAL LIMITED DURATION FUND

                     STATEMENT OF CHANGES IN NET ASSETS

     For the Year Ended December 31, 1997 and the Period April 23, 1996
        (Commencement of Investment Operations) to December 31, 1996
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       Year Ended       Period Ended
                                                                   December 31, 1997  December 31, 1996
- -------------------------------------------------------------------------------------------------------
<S>                                                                     <C>                <C>                
FROM INVESTMENT ACTIVITIES:                                                                                  
Operations:                                                                                                
Net Investment Income...............................................    $   471,577        $    327,591        
Net Realized Gain/Loss..............................................         25,119             (11,993)       
Net Unrealized Appreciation During the Period.......................            872              78,132        
                                                                        -----------        ------------       
                                                                                                             
Change in Net Assets from Operations................................        497,568             393,730        
                                                                        -----------        ------------       
Distributions from Net Investment Income............................       (471,639)           (327,529)       
Distributions from Net Realized Gain................................        (14,667)                  0        
                                                                        -----------        ------------       
Total Distributions.................................................       (486,306)           (327,529)       
                                                                        -----------        ------------       
                                                                                                             
NET CHANGE IN NET ASSETS FROM INVESTMENT ACTIVITIES.................         11,262              66,201        
                                                                        -----------        ------------       
                                                                                                             
FROM CAPITAL TRANSACTIONS:                                                                                   
                                                                                                             
Proceeds from Shares Sold...........................................        705,000          10,323,057        
Net Asset Value of Shares Issued Through Dividend Reinvestment......        483,346             305,526        
Cost of Shares Repurchased..........................................     (2,720,306)           (992,000)       
                                                                        -----------        ------------       
                                                                                                             
NET CHANGE IN NET ASSETS FROM CAPITAL TRANSACTIONS..................     (1,531,960)          9,636,583        
                                                                        -----------        ------------       
                                                                                                             
TOTAL INCREASE/DECREASE IN NET ASSETS...............................     (1,520,698)          9,702,784        
                                                                                                             
NET ASSETS:                                                                                                  
Beginning of the Period.............................................      9,752,784              50,000        
                                                                        -----------        ------------       
                                                                                                             
End of the Period (Including accumulated undistributed                                                   
  net investment income of ($1,541) and $62, respectively...........    $ 8,232,086        $  9,752,784        
                                                                        ===========        ============       
</TABLE>


                                               See Notes to Financial Statements

                                     B-49

<PAGE>   69
                EXPLORER INSTITUTIONAL LIMITED DURATION FUND

                            FINANCIAL HIGHLIGHTS

     The following schedule presents financial highlights for one share
          of the Fund outstanding throughout the period indicated.
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                                     April 23, 1996
                                                                                                     (Commencement
                                                                                                     of Investment
                                                                                  Year Ended         Operations) to
                                                                               December 31, 1997   December 31, 1996
- --------------------------------------------------------------------------------------------------------------------
<S>                                                                              <C>               <C>                  
Net Asset Value, Beginning of the Period ......................................  $     10.019       $        10.000         
                                                                                 ------------       ---------------         
Net Investment Income .........................................................         0.574                  .386         
Net Realized and Unrealized Gain ..............................................         0.036                  .019         
                                                                                 ------------       ---------------         
Total from Investment Operations ..............................................         0.610                  .405         
                                                                                                                            
Less:                                                                                                                       
  Distributions from Net Investment Income ....................................         0.574                  .386         
  Distributions from Net Realized Gain ........................................         0.018                   -0-         
                                                                                 ------------       ---------------         
Total Distributions ...........................................................         0.592                  .386         
                                                                                 ------------       ---------------         
Net Asset Value, End of the Period ............................................        10.037       $        10.019         
                                                                                 ============       ===============         
                                                                                                                            
Total Return * ................................................................         6.29%                 4.14%**      
                                                                                                                            
Net Assets at End of the Period (In millions) .................................          $8.2                  $9.8         
                                                                                                                            
Ratio of Expenses to Average Net Assets* (a) ..................................         0.56%                 0.40%        
                                                                                                                            
Ratio of Net Investment Income to Average Net Assets* .........................         5.74%                 5.68%        
                                                                                                                            
Portfolio Turnover ............................................................           41%                   16%**      
                                                                                                                            
*If certain expenses had not been assumed by VKAC, Total Return would have                                                  
 been lower and the ratios would have been as follows:                                                                      
                                                                                                                            
Ratio of Expenses to Average Net Assets (a) ...................................         1.86%                 1.40%        
                                                                                                                            
Ratio of Net Investment Income to Average Net Assets ..........................         4.59%                 4.68%        
</TABLE>

** Non-Annualized                                                           

(a) The ratios of Expenses to Average Net Assets do not reflect credits earned
    on overnight cash balances.  If these credits were reflected as a reduction
    of expenses, the ratios would decrease by .16% for the period ended 
    December 31, 1997.
                                               See Notes to Financial Statements

                                     B-50

<PAGE>   70
                        THE EXPLORER INSTITUTIONAL TRUST

                          NOTES TO FINANCIAL STATEMENTS

                                December 31, 1997
- --------------------------------------------------------------------------------

1.  SIGNIFICANT ACCOUNTING POLICIES

The Explorer Institutional Trust (the "Trust") is registered under the
Investment Company Act of 1940, as amended, as an open-end management investment
company comprised of two funds: Explorer Institutional Active Core Fund ("Active
Core Fund") and Explorer Institutional Limited Duration Fund ("Limited Duration
Fund"). Each Fund is accounted for as a separate entity.

      Active Core Fund's investment objective is to provide an enhanced level of
total return as compared to an investment in an unmanaged portfolio consisting
primarily of investment grade intermediate- and long-term income securities of
U.S. issuers. Limited Duration Fund's investment objective is to provide an
enhanced level of total return as compared to an investment in an unmanaged
portfolio consisting primarily of investment grade short-and intermediate-term
income securities of U.S. issuers, consistent with the preservation of capital.
The Funds commenced investment operations on April 23, 1996.

     The following is a summary of significant accounting policies consistently
followed by the Trust in the preparation of its financial statements. The
preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates.

A. SECURITY VALUATION -- Investments are stated at value using market quotations
or, if such valuations are not available, estimates obtained from yield data
relating to instruments or securities with similar characteristics in accordance
with procedures established in good faith by the Board of Trustees. Short-term
securities with remaining maturities of 60 days or less are valued at amortized
cost.

B. SECURITY TRANSACTIONS -- Security transactions are recorded on a trade date
basis. Realized gains and losses are determined on an identified cost basis. The
Funds may purchase and sell securities on a "when issued" or "delayed delivery"
basis, with settlement to occur at a later date. The value of the security so
purchased is subject to market fluctuations during this period. The Funds will
maintain, in a segregated account with its custodian, assets having an aggregate
value at least equal to the amount of the when issued or delayed delivery
purchase commitments until payment is made. At December 31, 1997, there were no
when issued or delayed delivery purchase commitments.

C. INVESTMENT INCOME -- Interest income is recorded on an accrual basis. Bond
discount and premium are amortized over the life of each applicable security.

D. ORGANIZATIONAL COSTS -- The Funds will reimburse Van Kampen American Capital
Distributors, Inc. or its affiliates (collectively "VKAC") for costs incurred in
connection with the Funds' organization in the amount of $47,718 for Active Core
Fund and $48,676 for Limited Duration Fund. These costs are being amortized on a
straight line basis over the 60 month period ending April 22, 2001. Van Kampen
American Capital Management, Inc. (the "Adviser") has agreed that in the event
any of the initial shares of the Funds originally purchased by VKAC are redeemed
during the amortization period, the Funds will be reimbursed for any unamortized
organizational costs in the same proportion as the number of shares redeemed
bears to the number of initial shares held at the time of redemption.

E. FEDERAL INCOME TAXES -- It is the Funds' policy to comply with the
requirements of the Internal Revenue Code applicable to regulated investment
companies and to distribute substantially all of its taxable income and gains to
its shareholders. Therefore, no provision for federal income taxes is required.

      The following table presents the identified cost of investments at
December 31, 1997 for federal income tax purposes with the associated gross
unrealized appreciation, gross unrealized depreciation and net unrealized
appreciation/depreciation.

<TABLE>
<CAPTION>
                                  ACTIVE CORE            LIMITED
                                      FUND            DURATION FUND
                                 ---------------    ------------------
<S>                              <C>                <C>
Cost of long term and
  short-term investments .......     $4,646,616            $8,073,266
                                 ---------------    ------------------
Aggregate gross
  unrealized appreciation.......        153,505                79,544
Aggregate gross
  unrealized depreciation ......            268                   540
                                 ---------------    ------------------
Net unrealized
  appreciation .................       $153,237               $79,004
                                 ===============    ==================
</TABLE>

F. DISTRIBUTION OF INCOME AND GAINS -- Each Fund declares daily and pays 
monthly dividends from net investment income. Net realized gains, if any, are 
distributed annually. Distributions from net realized gains for book purposes 
may include short-term capital gains which are included in ordinary income for 
tax purposes.

      Due to inherent differences in the recognition of income, expenses and
realized gains/losses under generally accepted accounting principles and federal
income tax purposes, the amount of distributable net investment income may
differ between book and federal income tax purposes causing book basis
distributions in excess of net investment income for a particular period.
Permanent book and tax basis differences relating to the recognition of net
realized losses on paydowns of mortgaged backed obligations totaling $3,032 for
Active Core Fund and $1,541 for Limited

                                     B-51

<PAGE>   71
                      THE EXPLORER INSTITUTIONAL TRUST

                  NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                              December 31, 1997
- --------------------------------------------------------------------------------


Duration Fund have been reclassified from accumulated net realized gain/loss to
accumulated undistributed net investment income. 

      For federal income tax purposes, the following information is furnished
with respect to the distributions paid by the Funds during their taxable year
ended December 31, 1997. Active Core Fund designated $19,775 as a 28% rate
capital gain distribution and $2,800 as a 20% rate capital gain distribution.
Limited Duration Fund designated $126 as a 28% rate capital gain distribution
and $8,495 as a 20% rate capital gain distribution. Shareholders were sent a
1997 Form 1099-DIV in January, 1998 representing their proportionate share of
the capital gain distribution to be reported on their income tax returns.
        
G. EXPENSE REDUCTIONS -- During the year ended December 31, 1997, the custody
fees for Active Core Fund and Limited Duration Fund were reduced by $12,346 and
$12,978, respectively, as a result of credits earned on overnight cash balances.

2. INVESTMENT ADVISORY AGREEMENT AND OTHER TRANSACTIONS WITH AFFILIATES
Under the terms of each of the Fund's Investment Advisory Agreements, the
Adviser will provide investment advice and facilities to the Funds for an annual
fee payable monthly as follows:

<TABLE>
<CAPTION>
               AVERAGE NET ASSETS             % PER ANNUM
- ---------------------------------         ---------------
<S>                                          <C>
First $1 billion ..........................   .300 of 1%
Over $1 billion ...........................   .250 of 1%
</TABLE>

      VKAC has agreed to waive fees or reimburse certain expenses such that the
net expenses of each Fund will not exceed 0.40% of average net assets. Should
the assets of a particular fund increase sufficiently to allow for reimbursement
of prior year's excess expenses to VKAC without causing that funds' expense
ratio to exceed 0.40%, that fund may be required to reimburse VKAC for fees
waived and/or expenses assumed within the previous four years. Therefore, these
expense subsidies totaling $88,141 and $94,007 for Active Core Fund and Limited
Duration Fund, respectively, could become liabilities of each respective Fund at
a future date.

      For the year ended December 31, 1997, Active Core Fund and Limited
Duration Fund recognized expenses of approximately $600 and $500, respectively,
representing legal expenses provided by Skadden, Arps, Slate, Meagher & Flom
(Illinois), counsel to the Funds, of which a trustee of the Fund is an
affiliated person. All of this expense has been assumed by VKAC.

      For the year ended December 31, 1997, Active Core Fund and Limited
Duration Fund recognized expenses of approximately $9,800 and $10,100,
respectively, representing VKAC's cost of providing accounting services to the
Funds. These services are provided by VKAC at cost. All of this expense has been
assumed by VKAC.

      ACCESS Investor Services, Inc. ("ACCESS"), an affiliate of the Adviser,
serves as the shareholder servicing agent for the Funds. For the year ended
December 31, 1997, Active Core Fund and Limited Duration Fund recognized
expenses of approximately $17,500 each, representing ACCESS' cost of providing
transfer agency and shareholder services plus a profit. All of this expense has
been assumed by VKAC.

      Certain officers and trustees of the Funds are also officers and
directors of VKAC. The Funds do not compensate their officers or trustees who
are officers of VKAC.

      The Funds provides deferred compensation and retirement plans for their
trustees who are not officers of VKAC. Under the deferred compensation plan,
trustees may elect to defer all or a portion of their compensation to a later
date. Benefits under the retirement plan are payable for a ten-year period and
are based upon each trustee's years of service to the Funds. The maximum annual
benefit per trustee under the plan is equal to the trustee's annual retainer,
which is currently $2,500. Due to the size of the Funds, the trustees are
currently waiving their retainer fee.

      At December 31, 1997, VKAC owned 5,000 shares of each of the Funds.

3.  CAPITAL TRANSACTIONS

There are an unlimited number of shares of beneficial interest of each Fund
without par value authorized. 

      For the year ended December 31, 1997, transactions in common shares were 
as follows:
        
<TABLE>
<CAPTION>
                                    ACTIVE           LIMITED
                                   CORE FUND      DURATION FUND
                                 --------------  -----------------
<S>                              <C>             <C>
Beginning Shares ...............       559,271            973,451
Shares Sold ....................       183,711             70,461
Shares Issued through
  Dividend Reinvestment ........        44,685             48,307
Shares Repurchased .............      (302,158)          (272,024)
                                 =============   ================ 
Ending Shares ..................       485,509            820,195
                                 =============   ================ 
Capital at 12/31/97 ............    $4,763,330         $8,154,623
                                 =============   ================ 
</TABLE>


                                     B-52

<PAGE>   72
                      THE EXPLORER INSTITUTIONAL TRUST

                  NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                              December 31, 1997
- --------------------------------------------------------------------------------

For the period ended December 31, 1996, transactions in common shares were as
follows:


<TABLE>
<CAPTION>
                                    ACTIVE           LIMITED
                                   CORE FUND      DURATION FUND
                                 --------------  -----------------
<S>                             <C>              <C>
Beginning Shares ..............          5,000              5,000
Shares Sold ...................        680,125          1,037,883
Shares Issued through
  Dividend Reinvestment .......         14,916             30,568
Shares Repurchased ............       (140,770)          (100,000)
                                 -------------   ----------------
Ending Shares .................        559,271            973,451
                                 =============   ================
Capital at 12/31/96 ...........     $5,557,380         $9,686,583
                                 =============   ================
</TABLE>

4. INVESTMENT TRANSACTIONS

During the period, the cost of purchases and proceeds from sales of investments,
including principal paydowns, excluding forward commitment transactions and
short-term investments, were $6,428,852 and $7,269,582 for Active Core Fund and
$3,074,911 and $5,398,346 for Limited Duration Fund.

5. MORTGAGE BACKED SECURITIES

A Mortgage Backed Security (MBS) is a pass-through security created by pooling
mortgages and selling participations in the principal and interest payments
received from borrowers. Most of these securities are guaranteed by federally
sponsored agencies, such as Government National Mortgage Association (GNMA),
Federal National Mortgage Association (FNMA) or Federal Home Loan Mortgage
Corporation (FHLMC).

      A Collateralized Mortgage Obligation (CMO) is a bond which is
collateralized by a pool of MBS's. These MBS pools are divided into classes or
tranches with each class having its own characteristics. For instance, a PAC
(Planned Amortization Class) is a specific class of mortgages which over its
life will generally have the most stable cash flows and the lowest prepayment
risk.


                                     B-53

<PAGE>   73
                                                          INDIVIDUAL APPLICATION
- --------------------------------------------------------------------------------
 
1   ACCOUNT REGISTRATION
 
<TABLE>
<S><C>
      INITIAL INVESTMENT($500,000 Minimum)                          Mail Application to:
      Wire instructions will be supplied upon receipt of            Edward Treichel, Sr., VP
      application                                                   EXPLORER INSTITUTIONAL FUNDS(SM)
      Explorer Institutional Active Core Fund  Amount: $_________   Institutional Asset Management
      Explorer Institutional Limited Duration Fund Amount: $_____   4th Floor
                                                                    One Parkview Plaza
                                                                    Oakbrook Terrace, IL 60181
                                                                    Phone # 1-800-822-3699
- --------------------------------------------------------------------------------
 
    A. INDIVIDUAL OR JOINT TENANTS                  SOCIAL SECURITY NUMBER
 
- ---------------------------------                 -------------------------------  
FIRST  MIDDLE  LAST                                 Registration will be "Joint    
                                                    Tenants with Right of          
                                                    Survivorship" unless           
- ---------------------------------                   otherwise specified here:      
FIRST  MIDDLE LAST                                                                 

    B. ADDRESS
 
- ---------------------------------------           ------------------------------
    STREET OR P.O. BOX                              TELEPHONE (DURING THE DAY)
 
- ---------------------------------------           ------------------------------
CITY      STATE     ZIP CODE                        CITIZEN OF
 
- --------------------------------------------------------------------------------
 
2   DISTRIBUTIONS All distributions are reinvested in shares of the Fund unless
you elect otherwise.
    [ ] Payment Order. Dividends and redemptions should be wired to the
following bank rather than the registered owner.
 
      ------------------------------------------------------------       ------------------------------------
      BANK NAME                                                                     ACCOUNT NUMBER
      ------------------------------------------------------------

      ------------------------------------------------------------
      ADDRESS
      ------------------------------------------------------------
      CITY                   STATE                   ZIP CODE
- --------------------------------------------------------------------------------
 
3   AUTOMATED ACCOUNT SERVICES (This section must be completed or redemption
    requests can only be accepted in writing)
 
    A. EXPEDITED TELEPHONE REDEMPTIONS
 
    [ ] I authorize the Fund, upon receipt of instructions received by telephone
        from any person, to redeem shares from my account to wire the proceeds
        of redemptions to my commercial bank account as follows. I understand,
        as set forth in the prospectus, that shareholders bear the risk of loss
        with respect to fraudulent telephone redemptions (subject to the terms
        and conditions set forth in the prospectus).
        Wires: Minimum $ ______________.
 
    B. AUTOMATED DIVIDEND PROGRAMS
 
      I authorize the Fund to:
 
    [ ] Deposit distributions from my Fund Account into the bank account
        indicated (subject to the terms and conditions outlined in the
        Prospectus). NOTE: IF NAME OF BANK ACCOUNT IS OTHER THAN THE
        REGISTRATION OWNER OF THE FUND ACCOUNT, THE SIGNATURE GUARANTEE IN #4
        MUST BE COMPLETED.
- --------------------------------------------------------------------------------
</TABLE>
 
                                      B-54
<PAGE>   74
 
- --------------------------------------------------------------------------------
 
4   SIGNATURE AND BACKUP WITHHOLDING CERTIFICATE
 
    I certify that I am of legal age and have received and read the Fund's
    current prospectus. Under penalty of perjury, I certify that (1) the number
    shown on this application form is the correct taxpayer identification number
    and (2) I am not subject to backup withholding because I have not been
    notified by the Internal Revenue Service ("IRS") that I am subject to backup
    withholding as a result of a failure to report all interest or dividends, or
    the IRS has notified me that I am no longer subject to backup withholding.
 
<TABLE>
      <S>                                                             <C>
                                                                      Signature Guarantee (if required)
      ---------------------------------------    -------------------  ------------------------------------------------
      SIGNATURE                                  DATE
                                                                      ------------------------------------------------
      ---------------------------------------    -------------------  
      JOINT OWNER                                DATE                 
                                                                      
</TABLE>
 
    You must cross out item (2) above if you have been notified by the IRS that
    you are subject to backup withholding because of underreporting interest or
    dividends on your tax return and you have not been notified by the IRS that
    you are no longer subject to backup withholding.
 
- --------------------------------------------------------------------------------
 
5   COMPLETED BY ACCOUNT EXECUTIVE
 
<TABLE>
      <S>                                                         <C>
      -----------------------------------------------------       ---------------------------------
      NAME OF VAN KAMPEN AMERICAN CAPITAL ACCOUNT EXECUTIVE       TELEPHONE
 
      -----------------------------------------------------
      OFFICE LOCATION
                                                                                  VKAC Account Number/Date
                                                                      ------------------------------------------------

                                                                      ------------------------------------------------
</TABLE>
 
                                      B-55
<PAGE>   75
<TABLE>
<S><C>
 
                                                                                                  INSTITUTIONAL APPLICATION
    =======================================================================================================================
 
1   ACCOUNT REGISTRATION
                                                                                       Mail Application to:
                                                                                       Edward Treichel, Sr., VP
                                                                                       EXPLORER INSTITUTIONAL FUNDS(SM)
                                                                                       Institutional Asset Management
    INITIAL INVESTMENT($500,000 Minimum)                                               4th Floor
    Wire instructions will be supplied upon receipt of application                     One Parkview Plaza
    Explorer Institutional Active Core Fund (7481)       Amount: $________________     Oakbrook Terrace, IL 60181
    Explorer Institutional Limited Duration Fund (7482)  Amount: $________________     Phone # 1-800-822-3699

    -----------------------------------------------------------------------------------------------------------------------
    A. CORPORATION, ORGANIZATION, PARTNERSHIP, FIDUCIARY, TRUST, ETC.

    ______________________________________________________________________________     ____________________________________
    NAME                                                                               TAX IDENTIFICATION NUMBER
 
    ______________________________________________________________________________     ____________________________________
    NAME(S) OF TRUSTEES/BENEFICIARY(IES) TO BE INCLUDED IN REGISTRATION                DATE OF TRUST AGREEMENT
 
    =======================================================================================================================
 
2   DISTRIBUTIONS All distributions are reinvested in shares of the Fund unless you elect otherwise.
    [ ] Payment Order. Dividends and redemptions should be wired to the following bank rather than the registered owner.
 
    ______________________________________________________________________________     ____________________________________
    BANK NAME                                                                                   ACCOUNT NUMBER
    ______________________________________________________________________________     
    ADDRESS
    ______________________________________________________________________________     
    CITY                       STATE                   ZIP CODE
 
    =======================================================================================================================

3   AUTOMATED ACCOUNT SERVICES (This section must be completed or redemption requests can only be accepted in writing)
 
    A. EXPEDITED TELEPHONE REDEMPTIONS
 
    [ ] I authorize the Fund, upon receipt of instructions received by telephone from any person, to redeem shares from my 
        account to wire the proceeds of redemptions to my commercial bank account as follows. I understand, as set forth 
        in the prospectus, that shareholders bear the risk of loss with respect to fraudulent telephone redemptions 
        (subject to the terms and conditions set forth in the prospectus).
         Wires: minimum $____________.
 
    B. AUTOMATED DIVIDEND PROGRAMS
 
       I authorize the Fund to:
 
    [ ] Deposit distributions from my Fund Account into the bank account indicated (subject to the terms and conditions 
        outlined in the Prospectus). NOTE: IF NAME OF BANK ACCOUNT IS OTHER THAN THE REGISTERED OWNER OF THE FUND ACCOUNT, 
        THE SIGNATURE GUARANTEE IN #4 MUST BE COMPLETED.
    =======================================================================================================================

</TABLE>
 
                                      B-56
<PAGE>   76
 
- --------------------------------------------------------------------------------
 
4   SIGNATURE AND BACKUP WITHHOLDING CERTIFICATE
 
    I certify that I am of legal age and have received and read the Fund's
    current prospectus. Under penalty of perjury, I certify that (1) the number
    shown on this application form is the correct taxpayer identification number
    and (2) I am not subject to backup withholding because I have not been
    notified by the Internal Revenue Service ("IRS") that I am subject to backup
    withholding as a result of a failure to report all interest or dividends, or
    the IRS has notified me that I am no longer subject to backup withholding.
 
<TABLE>
      <S>                                                             <C>
                                                                      Signature Guarantee (if required)
      ---------------------------------------    -------------------  ------------------------------------------------
      SIGNATURE                                  DATE
                                                                      ------------------------------------------------
      ---------------------------------------    -------------------  
      JOINT OWNER                                DATE
                                                                      
</TABLE>
 
    You must cross out item (2) above if you have been notified by the IRS that
    you are subject to backup withholding because of underreporting interest or
    dividends on your tax return and you have not been notified by the IRS that
    you are no longer subject to backup withholding.
 
- --------------------------------------------------------------------------------
 
5   COMPLETED BY ACCOUNT EXECUTIVE
 
<TABLE>
      <S>                                                         <C>
      -----------------------------------------------------       ---------------------------------
      NAME OF VAN KAMPEN AMERICAN CAPITAL ACCOUNT EXECUTIVE       TELEPHONE
 
      -----------------------------------------------------
      OFFICE LOCATION
                                                                                  VKAC Account Number/Date
                                                                      ------------------------------------------------

                                                                      ------------------------------------------------
</TABLE>
 
- --------------------------------------------------------------------------------
 
                                      B-57
<PAGE>   77
 
                           PART C: OTHER INFORMATION
 
ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS.
 
   
<TABLE>
<S><C>    
    (A) FINANCIAL STATEMENTS:
 
        Included in the Prospectus:
              Financial Highlights
        Included in Statement of Additional Information:
              Report of Independent Accountants
              Financial Statements
              Notes to Financial Statements
 
     (B) EXHIBITS:
 
           (1) (a)   Agreement and Declaration of Trust(1)
               (b)   Form of Amendment to the Agreement and Declaration of Trust(2)
               (c)   Amended Certificate of Designation -- Active Core Fund(3)
               (d)   Amended Certificate of Designation -- Limited Duration Fund(3)
           (2)       By-Laws of the Registrant(1)
           (4)       Form of Specimen of Share Certificate
               (a)   Active Core Fund(1)
               (b)   Limited Duration Fund(1)
           (5)       Investment Advisory Agreement
               (a)   Active Core Fund+
               (b)   Limited Duration Fund+
           (6)       Distribution Agreement
               (a)   Active Core Fund+
               (b)   Limited Duration Fund+
           (8) (a)   Custodian Contract(4)
               (b)   Transfer Agency and Service Agreement+
           (9) (a)   Fund Accounting Agreement(5)
               (b)   Amended and Restated Legal Services Agreement+
          (10)       Opinion and Consent of Skadden, Arps, Meagher & Flom (Illinois)(2)
               (a)   Active Core Fund(1)
               (b)   Limited Duration Fund(1)
          (11)       Consent of KPMG Peat Marwick LLP+
          (13)       Form of Letter Agreement(1)
          (14) (a)   Copy of Proposed Model Simplified Employee Pension Plan(1)
               (b)   Copy of Proposed Model Individual Retirement Account Plan(1)
               (c)     (i)  Copy of Proposed Profit-Sharing Adoption Agreement for
                            Prototype Paired Defined Contribution Plan(1)
                      (ii)  Copy of Proposed Money Purchase Pension Adoption Agreement
                            for Prototype Paired Defined Contribution Plan(1)
          (16)       Schedule for Computation of Performance Quotations+
          (17) (a)   Investment Companies for which Van Kampen American Capital
                     Distributors, Inc. acts as principal underwriter or depositor(4)
               (b)   List of Officers and Directors of Van Kampen American Capital
                     Distributors, Inc.(4)
          (24)       Power of Attorney(2)
          (27)       Financial Data Schedules+
</TABLE>
    
 
- -------------------------
 
(1) Incorporated by reference to the Trust's Registration Statement on Form
    N-1A, File No. 33-84942, filed on October 11, 1994.
 
(2) Incorporated by reference to the Trust's Registration Statement on Form
    N-1A, File No. 33-84942, filed on November 13, 1995.
 
   
(3) Incorporated by reference to the Trust's Registration Statement
    Post-Effective Amendment No. 1 on Form N-1A, File No. 33-84942, filed on
    April 28, 1997.
    
 
                                       C-1
<PAGE>   78
 
   
(4) Incorporated by reference to Van Kampen American Capital Growth and Income
    Fund Registration Statement Post-Effective Amendment No. 25 on Form N-1A,
    File No. 2-21657 filed on March 27, 1998.
    
 
   
(5) Incorporated by reference to Van Kampen American Capital Comstock Fund
    Registration Post-Effective Amendment No. 50 on Form N-1A, File No. 2-27778
    filed on April 27, 1998.
    
 
 + Filed herewith.
 
ITEM 25. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT:
 
     Please refer to the section of the Statement of Additional Information
captioned "Trustees and Officers."
 
ITEM 26. NUMBER OF HOLDERS OF SECURITIES:
 
   
     As of April 3, 1998:
    
 
<TABLE>
<CAPTION>
                                                      (2)
                       (1)                           NUMBER
                                                       OF
                                                     RECORD
                                                    HOLDERS
                  TITLE OF CLASS                    -------
<S>                                                 <C>
Shares of Beneficial Interest no par value
  Active Core Fund................................     5
  Limited Duration Fund...........................     3
</TABLE>
 
ITEM 27. INDEMNIFICATION:
 
     Reference is made to Article 8 Section 8.4 of the Registrant's Agreement
and Declaration of Trust.
 
     Article 8 Section 8.4 of the Agreement and Declaration of Trust provides
that each officer and trustee of the Registrant shall be indemnified by the
Registrant against all liabilities incurred in connection with the defense or
disposition of any action, suit or other proceeding, whether civil or criminal
in which the officer or trustee may be or may have been involved by reason of
being or having been an officer or trustee, except that such indemnity shall not
protect any such person against a liability to the Registrant or any shareholder
thereof to which such person would otherwise be subject by reason of willful
misfeasance, bad faith, gross negligence or reckless disregard of the duties
involved in the conduct of his or her office. Absent a court determination that
an officer or trustee seeking indemnification was not liable on the merits or
guilty of willful misfeasance, bad faith, gross negligence or reckless disregard
of the duties involved in the conduct of his or her office, the decision by the
Registrant to indemnify such person must be based upon the reasonable
determination of independent counsel or non-party independent trustees, after
review of the facts, that such officer or trustee is not guilty of willful
misfeasance, bad faith, gross negligence or reckless disregard of the duties
involved in the conduct of his or her office.
 
     The Registrant has purchased insurance on behalf of its officers or
trustees protecting such person from liability arising from their activities as
officers or trustees of the Registrant. The insurance does not protect or
purport to protect such persons from liability to the Registrant or to its
shareholders to which such officers or trustee would otherwise be subject by
reason of willful misfeasance, bad faith, gross negligence or reckless disregard
of the duties involved in the conduct of their office.
 
     Conditional advancing of indemnification monies may be made if the trustee
or officer undertakes to repay the advance unless it is ultimately determined
that he or she is entitled to the indemnification and only if the following
conditions are met; (1) the trustee or officer provides a security for the
undertaking; (2) the Registrant is insured against losses arising from lawful
advances; or (3) a majority of a quorum of the Registrant's disinterested,
non-party trustees, or an independent legal counsel in a written opinion, shall
determine, based upon a review of readily available facts that a recipient of
the advance ultimately will be found entitled to indemnification.
 
     Insofar as indemnification for liabilities arising under Securities Act of
1933 (the "Act") may be permitted to trustees, officers and controlling persons
of the Registrant pursuant to the foregoing provisions or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by the trustee, officer, or controlling person of the
Registrant in the successful
 
                                       C-2
<PAGE>   79
 
defense of any action, suit or proceeding) is asserted by such trustee, officer
or controlling person in connection with the shares being registered, the
Registrant will, unless in the opinion of its counsel the matter has been
settled by controlling precedent, submit to a court of appropriate jurisdiction
the question whether such indemnification by it is against public policy as
expressed in the Act and will be governed by the final adjudication of such
issue.
 
ITEM 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER:
 
     See "How the Funds Are Managed" in the Prospectus and "Trustees and
Officers" in the Statement of Additional Information for information regarding
the business of the Adviser. For information as to the business, profession,
vocation or employment of a substantial nature of each of the officers and
Directors of Van Kampen American Capital Management, Inc., reference is made to
the Adviser's current Form ADV filed under the Investment Advisers Act of 1940,
incorporated herein by reference.
 
ITEM 29. PRINCIPAL UNDERWRITERS
 
     (a) The sole principal underwriter is Van Kampen American Capital
Distributors, Inc. which acts as a principal underwriter for the investment
companies and the unit investment trusts set forth in Exhibit (17)(a) hereto.
 
     (b) Van Kampen American Capital Distributors, Inc., the only principal
underwriter for Registrant, is an affiliated person of an affiliated person of
the Fund. The name, principal business address and positions and offices with
Van Kampen American Capital Distributors, Inc. of each of the officers thereof
are set forth in Exhibit (17)(b). Except as disclosed under the heading,
"Trustees and Officers" in Part B of this Registration Statement, none of such
persons has any position or office with Registrant.
 
     (c) Not applicable.
 
ITEM 30. LOCATION OF ACCOUNTS AND RECORDS:
 
     All accounts, books and other documents required by Section 31(a) of the
Investment Company Act of 1940 and the Rules thereunder to be maintained (i) by
Registrant will be maintained at its offices, located at One Parkview Plaza,
Oakbrook Terrace, Illinois 60181, or at ACCESS Investors Services, Inc., 7501
Tiffany Springs Parkway, Kansas City, Missouri 64153 or at State Street Bank and
Trust Company, 1776 Heritage Drive, North Quincy, MA; (ii) by the Adviser, will
be maintained at its offices, located at One Parkview Plaza, Oakbrook Terrace,
Illinois 60181; and (iii) by Van Kampen American Capital Distributors, Inc., the
principal underwriter, will be maintained at its offices located at One Parkview
Plaza, Oakbrook Terrace, Illinois 60181.
 
ITEM 31. MANAGEMENT SERVICES:
 
     Not applicable.
 
ITEM 32. UNDERTAKINGS:
 
     (a) Not applicable.
 
   
     (b) Registrant undertakes to furnish each person to whom a prospectus is
delivered with a copy of Registrant's latest annual report to shareholders, upon
request and without charge.
    
 
   
     (c) Registrant has undertaken that if it does not hold annual meetings it
will abide by Section 16(c) of the 1940 Act which provides certain rights to
shareholders.
    
 
                                       C-3
<PAGE>   80
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant, THE EXPLORER INSTITUTIONAL
TRUST, certifies that it meets all of the requirements for effectiveness of this
Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933
and has duly caused this Amendment to this Registration Statement to be signed
on its behalf by the undersigned, thereto duly authorized in the City of
Oakbrook Terrace, and the State of Illinois, on April 28, 1998.
 
                                          THE EXPLORER INSTITUTIONAL TRUST
                                          
                                       By:             /S/ RONALD A. NYBERG
                                          --------------------------------------
                                                      Ronald A. Nyberg
                                                Vice President and Secretary
 
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
to this Registration Statement has been signed on April 28, 1997 by the
following persons in the capacities indicated:
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                             TITLE
                      ---------                                             -----
<S>                                                     <C>
               Chief Executive Officer
               /s/ DENNIS J. MCDONNELL*                 Chairman of the Board, President Chief
- ------------------------------------------------------  Executive Officer and Trustee
                 Dennis J. McDonnell
 
        Chief Financial and Accounting Officer
 
                 /s/ EDWARD C. WOOD*                    Vice President, Treasurer and Chief Financial
- ------------------------------------------------------  Officer
                    Edward C. Wood
 
                       Trustees
 
                  /s/ DAVID C. ARCH*                    Trustee
- ------------------------------------------------------
                    David C. Arch
 
                  /s/ ROD DAMMEYER*                     Trustee
- ------------------------------------------------------
                     Rod Dammeyer
 
                  /s/ HOWARD J KERR*                    Trustee
- ------------------------------------------------------
                    Howard J Kerr
 
                                                        Trustee
- ------------------------------------------------------
                    Steven Muller
 
                /s/ THEODORE A. MYERS*                  Trustee
- ------------------------------------------------------
                  Theodore A. Myers
 
                /s/ HUGO SONNENSCHEIN*                  Trustee
- ------------------------------------------------------
                  Hugo Sonnenschein
 
                 /s/ WAYNE W. WHALEN*                   Trustee
- ------------------------------------------------------
                   Wayne W. Whalen
</TABLE>
    
 
* Signed by Ronald A. Nyberg pursuant to power of attorney, as previously filed.
 
   
<TABLE>
<S>                                                     <C>
                 /s/ RONALD A. NYBERG                                                  April 28, 1998
- ------------------------------------------------------
                   Ronald A. Nyberg
                   Attorney-in-fact
</TABLE>
    
 
                                       C-4
<PAGE>   81
 
                        THE EXPLORER INSTITUTIONAL TRUST
 
   
           SCHEDULE OF EXHIBITS TO POST-EFFECTIVE AMENDMENT NO. 2 TO
    
        FORM N-1A SUBMITTED TO THE SECURITIES AND EXCHANGE COMMISSION ON
   
                                 APRIL 30, 1998
    
 
   
<TABLE>
<CAPTION>
    EXHIBIT
    NUMBER                               EXHIBIT
    -------                              -------
    <S>        <C>
 
     (5)(a)    Investment Advisory Agreement -- Active Core Fund
        (b)    Investment Advisory Agreement -- Limited Duration Fund
     (6)(a)    Distribution Agreement -- Active Core Fund
        (b)    Distribution Agreement -- Limited Duration Fund
     (8)(b)    Transfer Agency and Service Agreement
     (9)(b)    Amended and Restated Legal Services Agreement
    (11)       Consent of KPMG Peat Marwick LLP
    (16)       Schedule of Computation of Performance Quotations
    (27)       Financial Data Schedules
</TABLE>
    
 
                                       C-5

<PAGE>   1

                                                                 Exhibit (5)(a)

                         INVESTMENT ADVISORY AGREEMENT

THIS INVESTMENT ADVISORY AGREEMENT, dated as of May 31, 1997 (the "Agreement"),
by and between THE EXPLORER INSTITUTIONAL ACTIVE CORE FUND (the "Fund"), on
behalf of its sub-trust THE EXPLORER INSTITUTIONAL TRUST, a Massachusetts
business trust (the "Trust"), and VAN KAMPEN AMERICAN CAPITAL MANAGEMENT, INC.
(the "ADVISER"), a Delaware corporation.

     1.  (a) RETENTION OF ADVISER BY FUND.  Subject to the terms and conditions
set forth herein, the Fund hereby employs the Adviser to act as the investment
adviser for and to manage the investment and reinvestment of the assets of the
Fund in accordance with the Fund's investment objectives and policies and
limitations, and to administer its affairs to the extent requested by, and
subject to the review and supervision of, the Board of Trustees of the Fund for
the period and upon the terms herein set  forth.  The investment of funds shall
be subject to all applicable restrictions of applicable law and of the
Declaration of Trust and By-Laws of the Trust, and resolutions of the Board of
Trustees of the Fund as may from time to time be in force and delivered or made
available to the Adviser.

     (b) ADVISER'S ACCEPTANCE OF EMPLOYMENT.  The Adviser accepts such
employment and agrees during such period to render such services, to supply
investment research and portfolio management (including without limitation the
selection of securities for the Fund to purchase, hold or sell and the
selection of brokers through whom the Fund's portfolio transactions are
executed, in accordance with the policies adopted by the Fund and its Board of
Trustees), to administer the business affairs of the Fund, to furnish offices
and necessary facilities and equipment to the Fund, to provide administrative
services for the Fund, to render periodic reports to the Board of Trustees of
the Fund, and to permit any of its officers or employees to serve without
compensation as trustees or officers of the Fund if elected to such positions.

     (c) ESSENTIAL PERSONNEL.  For a period of one year commencing on the
effective date of this Agreement, the Adviser and the Fund agree that the
retention of (i) the chief executive officer, president, chief financial
officer and secretary of the Adviser and (ii) each director, officer and
employee of the Adviser or any of its Affiliates (as defined in the Investment
Company Act of 1940, as amended (the "1940 Act")) who serves as an officer of
the Fund (each person referred to in (i) or (ii) hereinafter being referred to
as an "Essential Person"), in his or her current capacities, is in the best
interest of the Fund and the Fund's shareholders.  In connection with the
Adviser's acceptance of employment hereunder, the Adviser hereby agrees and
covenants for itself and on behalf of its Affiliates that neither the Adviser
nor any of its Affiliates shall make any material or significant personnel
changes or replace or seek to replace any Essential Person or cause to be
replaced any Essential Person, in each case without first informing the Board
of Trustees of the Fund in a timely manner.  In Addition, neither the Adviser
nor any Affiliate of the Adviser shall change or seek to change or cause to be
changed, in any material respect, the duties and responsibilities of any
Essential Person, in each case without first informing the Board of Trustees of
the Fund in a timely manner.

     (d)  INDEPENDENT CONTRACTOR.  The Adviser shall be deemed to be an
independent contractor under this Agreement and, unless otherwise expressly
provided or authorized, shall have no authority to act for or represent the
Fund in any way or otherwise be deemed as agent of the Fund.

     (e)  NON-EXCLUSIVE AGREEMENT.  The services of the Adviser to the Fund
under this Agreement are not to be deemed exclusive, and the Adviser shall be
free to render similar services or other services to others so long as its
services hereunder are not impaired thereby.

     2.  (a)  FEE.  For the services and facilities described in Section 1, the
Fund will accrue daily and pay to the Adviser at the end of each calendar month
an investment management fee computed based on a fee rate (expressed as a
percentage per annum) applied to the average daily net assets of the Fund as
follows:


<PAGE>   2

<TABLE>
<CAPTION>
                                               FEE PERCENT    
                                               PER ANNUM OF   
              AVERAGE DAILY                    AVERAGE DAILY  
              NET ASSETS (MILLIONS)            NET ASSETS     
              ---------------------            ----------     
              <S>                              <C>            
              Up to one billion dollars        0.30%          
              Thereafter                       0.25%          
</TABLE>

     (b)  EXPENSE LIMITATION.  The adviser's compensation for any fiscal year
of the Fund shall be reduced by the amount, if any, by which the Fund's expense
for such fiscal year exceeds the most restrictive applicable expense limitation
in any jurisdiction in which the Fund's shares are qualified for offer and
sale, as such limitations set forth in the most recent notice thereof furnished
by the Adviser to the Fund.  For purposes of this paragraph there shall be
excluded from computation of the Fund's expenses any amount borne directly or
indirectly by the Fund which is permitted to be excluded from the computation
of such limitation by such statue or regulatory authority.  If for any month
expenses of the Fund properly included in such calculation exceed 1/12 of the
amount permitted annually by the most restrictive applicable expense
limitation, the payment to the Adviser for that month shall be reduced, and, if
necessary, the Adviser shall make a refund payment to the Fund, so that the
total net expense for the month will not exceed 1/12 of such amount.  As of the
end of the Fund's fiscal year, however, the computations and payments shall be
readjusted so that the aggregate compensation payable to the Adviser for the
year is equal to the fee set forth in subsection (a) of this Section 2,
diminished to the extent necessary so that the expenses for the year do not
exceed those permitted by the applicable expense limitation.

     (c)  DETERMINATION OF NET ASSET VALUE.   The net asset value of the Fund
shall be calculated as of the close of the New York Stock Exchange on each day
the Exchange is open for trading or   such other time or times as the trustees
may determine in accordance with  the provisions of applicable law and the
Declaration of Trust and By-Laws of the Trust, and resolutions of the Board of
Trustees of the Fund as from  time to time in force.  For the purpose of the 
foregoing computations, on each such day when net asset value is not 
calculated, the net asset value of a share of beneficial interest of the Fund
shall be deemed to be the net asset value of such share as of the close of
business of the last day on which such calculation was made.

     (d)  PRORATION.  For the month and year in which this Agreement becomes
effective or terminates, there shall be an appropriate proration of the
Adviser's fee on the basis of the number of days that the Agreement is in
effect during such month and year, respectively.

     3.  EXPENSES.  In addition to the fee of the Adviser, the Fund shall
assume and pay any expenses for services rendered by a custodian for the
safekeeping of the Fund's securities or other property, for keeping its books
of account, for any other changes of the custodian and for calculating the net
asset value of the Fund as provided above.  The adviser shall not be required
to pay, and the Fund shall assume and pay, the charges and expenses of its
operations, including compensation of the trustees (other than those who are
interested persons of the Adviser and other than those who are interested
persons of the distributor of the Fund but not of the Adviser, if the
distributor has agreed to pay such compensation), charges and expenses of
independent accountants, of legal counsel and of any transfer or dividend
disbursing agent, costs of acquiring and disposing of portfolio securities,
cost of listing shares on the New York Stock Exchange or other exchange,
interest (if any) on obligations incurred by the Fund, costs of shares
certificates, membership dues in the Investment Company Institute or any
similar organization, costs of reports and notices to shareholders, cost of
registering shares of the Fund under the federal securities laws, miscellaneous
expenses and all taxes and fees to federal, state or other governmental
agencies on account of the registration of securities issued by the Fund,
filing of corporate documents or otherwise.  The Fund shall not pay or incur
any obligation for any management or administrative expenses for which the Fund
intends to seek reimbursement from the Adviser without first obtaining the
written approval of the Adviser.  The Adviser shall arrange, if desired by the
Fund, for officers or employees of the Adviser to serve, without compensation
from the Fund, as trustees, officers or agents of the Fund if duly elected or
appointed to such positions and subject to their individual consent and to any
limitations imposed by the law.


<PAGE>   3


     4.  INTERESTED PERSONS.  Subject to applicable statutes and regulations,
it is understood that trustees, officers, shareholders and agents of the Fund
are or may be interested in the Adviser as directors, officers, shareholders,
agents or otherwise and that the directors, officers, shareholders and agents
of the Adviser may be interested in the Fund as trustees, officers,
shareholders, agents or otherwise.

     5.  LIABILITY.  The Adviser shall not be liable for any error of judgment
or of law, or for any loss suffered by the Fund in connection with the matters
to which this Agreement relates, except a loss resulting from willful
misfeasance, bad faith or gross negligence on the part of the Adviser in the
performance of its obligations and duties, or by reason of its reckless
disregard of its obligations and duties under this Agreement.

     6.  (a)  TERM.  This Agreement shall become effective on the date hereof
and shall remain in full force until May 31, 1999 unless sooner terminated as
hereinafter provided.  This Agreement shall continue in force from year to year
thereafter, but only for so long as such continuance is specifically approved
as least annually, in the manner required by the 1940 Act.

     (b)  TERMINATION.  This Agreement shall automatically terminate in the
event of its assignment.  This Agreement may be terminated at any time without
the payment of any penalty by the Fund or by the Adviser on sixty (60) days
written notice to the other party.  The Fund may effect termination by action
of the Board of Trustees or by vote of a majority of the outstanding shares of
stock of the Fund, accompanied by appropriate notice.  This Agreement may be
terminated at any time without the payment of any penalty and without advance
notice by the Board of Trustees or by vote of a majority of the outstanding
shares of the Fund in the event that it shall have been established by a court
of competent jurisdiction that the Adviser or any officer or director of the
Adviser has taken any action which results in a breach of the covenants of the
Adviser set forth herein.

     (c)  PAYMENT UPON TERMINATION.  Termination of this Agreement shall not
affect the right of the Adviser to receive payment on any unpaid balance of the
compensation described in Section 2 earned prior to such termination.

     7.  SEVERABILITY.  If any provision of this Agreement shall be held or
made invalid by a court decision, statue, rule or otherwise, the remainder
shall not thereby be affected.

     8.  NOTICES.  Any notice under this Agreement shall be in writing,
addressed and delivered or mailed, postage prepaid, to the other party at such
address as such other party may designate for the receipt of such notice.

     9.  DISCLAIMER.  The Adviser acknowledges and agrees that, as provided by
Section 8.1 of the Declaration of Trust of the Trust, (i) this Agreement has
been executed by officers of the Trust in their capacity as officers, and not
individually, and (ii) the shareholders, trustees, officers, employees and
other agents of the Trust and the Fund shall not personally be bound by or
liable hereunder, nor shall resort be had to their private property for the
satisfaction of any obligation or claim hereunder and that any such resort may
only be had upon the assets and property of the Fund.

10. USE OF THE NAME "EXPLORER INSTITUTIONAL".  Van Kampen American Capital Inc.
("Van  Kampen") has consented to the use by the Trust of  the  identifying word
or name "Explorer Institutional" in the name of the Trust and its Series. Such
consent  is  conditioned  upon the  employment of Van Kampen,  its successors
or any affiliate thereof, as investment advisor and distributor of the Trust
and each of its Series.   As between the Trust and itself, Van Kampen  controls
the  use of the name of the Trust insofar  as  such  name contains  "Explorer
Institutional".  The name or identifying word "Explorer Institutional"  may be
used from time to time in other connections and for  other purposes by Van
Kampen or affiliated entities.  Van Kampen may require the Trust to cease using
"Explorer Institutional" in the name of the Trust if  the Trust ceases to
employ, for any reason, Van Kampen, an affiliate, or any successor as
investment advisor and distributor of the Trust and each of its Series.


<PAGE>   4


     11.  GOVERNING LAW.  All questions concerning the validity, meaning and
effect of this Agreement shall be determined in accordance with the laws
(without giving effect to the conflict-of-law principles thereof) of the State
of Delaware applicable to contracts made and to be performed in that state.

     12.  NAME.  In connection with its employment hereunder, the Adviser
hereby agrees and covenants not to change its name without the prior consent of
the Board of Trustees of the Fund.


     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their officers designated below on the day and year first above
written.



     VAN KAMPEN AMERICAN                THE EXPLORER INSTITUTIONAL TRUST
     CAPITAL MANAGEMENT, INC.           on behalf of its sub-trust, THE EXPLORER
                                        INSTITUTIONAL ACTIVE CORE FUND




     By: /s/ Dennis J. McDonnell        By: /s/ Ronald A. Nyberg
         ----------------------------       ------------------------------
         Name: Dennis J. McDonnell          Name: Ronald A. Nyberg
         Title: President                   Title: Vice President & Secretary










<PAGE>   1

                                                                 Exhibit (5)(b)

                        INVESTMENT ADVISORY AGREEMENT

THIS INVESTMENT ADVISORY AGREEMENT, dated as of May 31, 1997 (the "Agreement"),
by and between THE EXPLORER INSTITUTIONAL LIMITED DURATION FUND (the "Fund"),
on behalf of its sub-trust THE EXPLORER INSTITUTIONAL TRUST, a Massachusetts
business trust (the "Trust"), and VAN KAMPEN AMERICAN CAPITAL MANAGEMENT, INC.
(the "ADVISER"), a Delaware corporation.

     1.  (a) RETENTION OF ADVISER BY FUND.  Subject to the terms and conditions
set forth herein, the Fund hereby employs the Adviser to act as the investment
adviser for and to manage the investment and reinvestment of the assets of the
Fund in accordance with the Fund's investment objectives and policies and
limitations, and to administer its affairs to the extent requested by, and
subject to the review and supervision of, the Board of Trustees of the Fund for
the period and upon the terms herein set  forth.  The investment of funds shall
be subject to all applicable restrictions of applicable law and of the
Declaration of Trust and By-Laws of the Trust, and resolutions of the Board of
Trustees of the Fund as may from time to time be in force and delivered or made
available to the Adviser.

     (b) ADVISER'S ACCEPTANCE OF EMPLOYMENT.  The Adviser accepts such
employment and agrees during such period to render such services, to supply
investment research and portfolio management (including without limitation the
selection of securities for the Fund to purchase, hold or sell and the
selection of brokers through whom the Fund's portfolio transactions are
executed, in accordance with the policies adopted by the Fund and its Board of
Trustees), to administer the business affairs of the Fund, to furnish offices
and necessary facilities and equipment to the Fund, to provide administrative
services for the Fund, to render periodic reports to the Board of Trustees of
the Fund, and to permit any of its officers or employees to serve without
compensation as trustees or officers of the Fund if elected to such positions.

     (c) ESSENTIAL PERSONNEL.  For a period of one year commencing on the
effective date of this Agreement, the Adviser and the Fund agree that the
retention of (i) the chief executive officer, president, chief financial
officer and secretary of the Adviser and (ii) each director, officer and
employee of the Adviser or any of its Affiliates (as defined in the Investment
Company Act of 1940, as amended (the "1940 Act")) who serves as an officer of
the Fund (each person referred to in (i) or (ii) hereinafter being referred to
as an "Essential Person"), in his or her current capacities, is in the best
interest of the Fund and the Fund's shareholders.  In connection with the
Adviser's acceptance of employment hereunder, the Adviser hereby agrees and
covenants for itself and on behalf of its Affiliates that neither the Adviser
nor any of its Affiliates shall make any material or significant personnel
changes or replace or seek to replace any Essential Person or cause to be
replaced any Essential Person, in each case without first informing the Board
of Trustees of the Fund in a timely manner.  In Addition, neither the Adviser
nor any Affiliate of the Adviser shall change or seek to change or cause to be
changed, in any material respect, the duties and responsibilities of any
Essential Person, in each case without first informing the Board of Trustees of
the Fund in a timely manner.

     (d)  INDEPENDENT CONTRACTOR.  The Adviser shall be deemed to be an
independent contractor under this Agreement and, unless otherwise expressly
provided or authorized, shall have no authority to act for or represent the
Fund in any way or otherwise be deemed as agent of the Fund.

     (e)  NON-EXCLUSIVE AGREEMENT.  The services of the Adviser to the Fund
under this Agreement are not to be deemed exclusive, and the Adviser shall be
free to render similar services or other services to others so long as its
services hereunder are not impaired thereby.

     2.  (a)  FEE.  For the services and facilities described in Section 1, the
Fund will accrue daily and pay to the Adviser at the end of each calendar month
an investment management fee computed based on a fee rate (expressed as a
percentage per annum) applied to the average daily net assets of the Fund as
follows:



<PAGE>   2
<TABLE>
<CAPTION>
                                                    FEE PERCENT
                                                    PER ANNUM OF
                AVERAGE DAILY                       AVERAGE DAILY 
                NET ASSETS (MILLIONS)               NET ASSETS
                ---------------------               ----------
                <S>                                 <C>
                Up to one billion dollars           0.30%
                Thereafter                          0.25%
</TABLE>


     (b)  EXPENSE LIMITATION.  The adviser's compensation for any fiscal year
of the Fund shall be reduced by the amount, if any, by which the Fund's expense
for such fiscal year exceeds the most restrictive applicable expense limitation
in any jurisdiction in which the Fund's shares are qualified for offer and
sale, as such limitations set forth in the most recent notice thereof furnished
by the Adviser to the Fund.  For purposes of this paragraph there shall be
excluded from computation of the Fund's expenses any amount borne directly or
indirectly by the Fund which is permitted to be excluded from the computation
of such limitation by such statue or regulatory authority.  If for any month
expenses of the Fund properly included in such calculation exceed 1/12 of the
amount permitted annually by the most restrictive applicable expense
limitation, the payment to the Adviser for that month shall be reduced, and, if
necessary, the Adviser shall make a refund payment to the Fund, so that the
total net expense for the month will not exceed 1/12 of such amount.  As of the
end of the Fund's fiscal year, however, the computations and payments shall be
readjusted so that the aggregate compensation payable to the Adviser for the
year is equal to the fee set forth in subsection (a) of this Section 2,
diminished to the extent necessary so that the expenses for the year do not
exceed those permitted by the applicable expense limitation.

     (c)  DETERMINATION OF NET ASSET VALUE.   The net asset value of the Fund
shall be calculated as of the close of the New York Stock Exchange on each day
the Exchange is open for trading or such other time or times as the trustees
may determine in accordance with the provisions of applicable law and the
Declaration of Trust and By-Laws of the Trust, and resolutions of the Board of
Trustees of the Fund as from time to time in force.  For the purpose of the 
foregoing computations, on each such day when net asset value is not
calculated, the net asset value of a share of beneficial interest of the Fund
shall be deemed to be the net asset value of such share as of the close of
business of the last day on which such calculation was made.

     (d)  PRORATION.  For the month and year in which this Agreement becomes
effective or terminates, there shall be an appropriate proration of the
Adviser's fee on the basis of the number of days that the Agreement is in
effect during such month and year, respectively.

     3.  EXPENSES.  In addition to the fee of the Adviser, the Fund shall
assume and pay any expenses for services rendered by a custodian for the
safekeeping of the Fund's securities or other property, for keeping its books
of account, for any other changes of the custodian and for calculating the net
asset value of the Fund as provided above.  The adviser shall not be required
to pay, and the Fund shall assume and pay, the charges and expenses of its
operations, including compensation of the trustees (other than those who are
interested persons of the Adviser and other than those who are interested
persons of the distributor of the Fund but not of the Adviser, if the
distributor has agreed to pay such compensation), charges and expenses of
independent accountants, of legal counsel and of any transfer or dividend
disbursing agent, costs of acquiring and disposing of portfolio securities,
cost of listing shares on the New York Stock Exchange or other exchange,
interest (if any) on obligations incurred by the Fund, costs of shares
certificates, membership dues in the Investment Company Institute or any
similar organization, costs of reports and notices to shareholders, cost of
registering shares of the Fund under the federal securities laws, miscellaneous
expenses and all taxes and fees to federal, state or other governmental
agencies on account of the registration of securities issued by the Fund,
filing of corporate documents or otherwise.  The Fund shall not pay or incur
any obligation for any management or administrative expenses for which the Fund
intends to seek reimbursement from the Adviser without first obtaining the
written approval of the Adviser.  The Adviser shall arrange, if desired by the
Fund, for officers or employees of the Adviser to serve, without compensation
from the Fund, as trustees, officers or agents of the Fund if duly elected or
appointed to such positions and subject to their individual consent and to any
limitations imposed by the law.



<PAGE>   3



     4.  INTERESTED PERSONS.  Subject to applicable statutes and regulations,
it is understood that trustees, officers, shareholders and agents of the Fund
are or may be interested in the Adviser as directors, officers, shareholders,
agents or otherwise and that the directors, officers, shareholders and agents
of the Adviser may be interested in the Fund as trustees, officers,
shareholders, agents or otherwise.

     5.  LIABILITY.  The Adviser shall not be liable for any error of judgment
or of law, or for any loss suffered by the Fund in connection with the matters
to which this Agreement relates, except a loss resulting from willful
misfeasance, bad faith or gross negligence on the part of the Adviser in the
performance of its obligations and duties, or by reason of its reckless
disregard of its obligations and duties under this Agreement.

     6.  (a)  TERM.  This Agreement shall become effective on the date hereof
and shall remain in full force until May 31, 1999 unless sooner terminated as
hereinafter provided.  This Agreement shall continue in force from year to year
thereafter, but only for so long as such continuance is specifically approved
as least annually, in the manner required by the 1940 Act.

     (b)  TERMINATION.  This Agreement shall automatically terminate in the
event of its assignment.  This Agreement may be terminated at any time without
the payment of any penalty by the Fund or by the Adviser on sixty (60) days
written notice to the other party.  The Fund may effect termination by action
of the Board of Trustees or by vote of a majority of the outstanding shares of
stock of the Fund, accompanied by appropriate notice.  This Agreement may be
terminated at any time without the payment of any penalty and without advance
notice by the Board of Trustees or by vote of a majority of the outstanding
shares of the Fund in the event that it shall have been established by a court
of competent jurisdiction that the Adviser or any officer or director of the
Adviser has taken any action which results in a breach of the covenants of the
Adviser set forth herein.

     (c)  PAYMENT UPON TERMINATION.  Termination of this Agreement shall not
affect the right of the Adviser to receive payment on any unpaid balance of the
compensation described in Section 2 earned prior to such termination.

     7.  SEVERABILITY.  If any provision of this Agreement shall be held or
made invalid by a court decision, statue, rule or otherwise, the remainder
shall not thereby be affected.

     8.  NOTICES.  Any notice under this Agreement shall be in writing,
addressed and delivered or mailed, postage prepaid, to the other party at such
address as such other party may designate for the receipt of such notice.

     9.  DISCLAIMER.  The Adviser acknowledges and agrees that, as provided by
Section 8.1 of the Declaration of Trust of the Trust, (i) this Agreement has
been executed by officers of the Trust in their capacity as officers, and not
individually, and (ii) the shareholders, trustees, officers, employees and
other agents of the Trust and the Fund shall not personally be bound by or
liable hereunder, nor shall resort be had to their private property for the
satisfaction of any obligation or claim hereunder and that any such resort may
only be had upon the assets and property of the Fund.

     10. USE OF THE NAME "EXPLORER INSTITUTIONAL".  Van Kampen American Capital
Inc. ("Van  Kampen") has consented to the use by the Trust of  the  identifying
word or name "Explorer Institutional" in the name of the Trust and its Series.
Such consent  is  conditioned  upon the  employment of Van Kampen,  its
successors or any affiliate thereof, as investment advisor and distributor of
the Trust and each of its Series.   As between the Trust and itself, Van Kampen
controls  the  use of the name of the Trust insofar  as  such  name contains
"Explorer Institutional".  The name or identifying word "Explorer
Institutional"  may be used from time to time in other connections and for
other purposes by Van Kampen or affiliated entities.  Van Kampen may require
the Trust to cease using "Explorer Institutional" in the name of the Trust if
the Trust ceases to employ, for any reason, Van Kampen, an affiliate, or any
successor as investment advisor and distributor of the Trust and each of its
Series.



<PAGE>   4



     11.  GOVERNING LAW.  All questions concerning the validity, meaning and
effect of this Agreement shall be determined in accordance with the laws
(without giving effect to the conflict-of-law principles thereof) of the State
of Delaware applicable to contracts made and to be performed in that state.

     12.  NAME.  In connection with its employment hereunder, the Adviser
hereby agrees and covenants not to change its name without the prior consent of
the Board of Trustees of the Fund.


     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their officers designated below on the day and year first above
written.


     VAN KAMPEN AMERICAN               THE EXPLORER INSTITUTIONAL TRUST
     CAPITAL MANAGEMENT, INC.          on behalf of its sub-trust, THE EXPLORER
                                       INSTITUTIONAL LIMITED DURATION FUND




     By: /s/ Dennis J. McDonnell       By: /s/ Ronald A. Nyberg
         -------------------------         ---------------------------------
         Name: Dennis J. McDonnell         Name: Ronald A. Nyberg
         Title: President                  Title: Vice President & Secretary











<PAGE>   1
                                                                    EXHIBIT 6(a)


                             DISTRIBUTION AGREEMENT


     THIS DISTRIBUTION AGREEMENT dated as of May 1, 1997 (the "Agreement")
by and between the THE EXPLORER INSTITUTIONAL TRUST, a Massachusetts business
trust (the "Trust"), on behalf of its sub-trust, the EXPLORER INSTITUTIONAL
ACTIVE CORE FUND (the "Fund"), and VAN KAMPEN AMERICAN CAPITAL DISTRIBUTORS,
INC., a Delaware corporation (the "Distributor").

     1.  Appointment of Distributor.  The Fund appoints the Distributor as a
principal underwriter and exclusive distributor of each class of its shares of
beneficial interest (the "Shares") offered for sale from time to time pursuant
to the then current prospectus of the Fund.  The Fund reserves the right to
refuse at any time or times to sell Shares hereunder for any reason deemed
adequate by the Board of Trustees of the Fund.

     The Distributor will use its best efforts to sell, through its
organization and through other dealers and agents, the Shares which the
Distributor has the right to purchase under Section 2 hereof, but the
Distributor does not undertake to sell any specific number of Shares.

     The Distributor agrees that it will not take any long or short positions
in the Shares, except for long positions in those Shares purchased by the
Distributor in accordance with any systematic sales plan described in the then
current Prospectus of the Fund and except as permitted by Section 2 hereof, and
that so far as it can control the situation, it will prevent any of its
trustees, officers or shareholders from taking any long or short positions in
the Shares, except for legitimate investment purposes.

     2.  Sale of Shares to Distributor.  The Fund hereby grants to the
Distributor the exclusive right, except as herein otherwise provided, to
purchase Shares directly from the Fund upon the terms herein set forth.

     The Distributor shall have the right to buy from the Fund the Shares
needed, but not more than the Shares needed (except for reasonable allowances
for clerical errors, delays and errors of transmission and cancellation of
orders) to fill unconditional orders for Shares received by the Distributor
from dealers, agents and investors during each period when particular net asset
values and public offering prices are in effect as provided in Section 3
hereof; and the price which the Distributor shall pay for the Shares so
purchased shall be the respective net asset value used in determining the
public offering price on which such orders were based.  The Distributor shall
notify the Fund at the end of each such period, or as soon thereafter on that
business day as the orders received in such period have been compiled, of the
number of Shares of each class that the Distributor elects to purchase
hereunder.

     3.  Public Offering Price.  The public offering price per Share shall be
determined in accordance with the then current Prospectus of the Fund.  In no
event shall the public offering price exceed the net asset value per Share.
The net asset value per share for each class of Shares, respectively, shall be
determined in the manner provided in the Declaration of Trust and By-Laws of
the Trust as then amended, the Certificate of Designation with respect to the
Fund, as amended, and in accordance with the then current Prospectus of the
Fund. The Fund will cause immediate notice to be given to the Distributor of
each change in net asset value as soon as it is determined.

     4.  Compliance with NASD Rules, SEC Orders, etc.  In selling Fund Shares,
the Distributor will in all respects duly comply with all state and federal
laws relating to the sale of such securities and with all applicable rules and
regulations of all regulatory bodies, including without limitation the Rules of
Fair Practice of the National Association of Securities Dealers, Inc., and all
applicable rules and regulations of the Securities and Exchange Commission
under the 1940 Act, and will indemnify and save the Fund harmless from any
damage or expense on account of any unlawful act by the Distributor or its
agents or employees.  The Distributor is not, however, to be responsible for
the acts of other dealers or agents, except to the extent that they shall be
acting for the Distributor or under its direction or authority.  None of
the Distributor, any dealer, any agent or any other person is authorized by the
Fund to give any

                                      1

<PAGE>   2


information or to make any representations, other than those contained in the
Registration Statement or Prospectus heretofore or hereafter filed with the
Securities and Exchange Commission under the Securities Act of 1933, as amended
(the "1933 Act") (as any such Registration Statement and Prospectus may have
been or may be amended from time to time), covering the Shares, and in any
supplemental information to any such Prospectus approved by the Fund in
connection with the offer or sale of Shares.  None of the Distributor, any
dealer, any broker or any other person is authorized to act as agent for the
Fund in connection with the offering or sale of Shares to the public or
otherwise.  All such sales shall be made by the Distributor as principal for
its own account.
        
     5.  Expenses.

            (a) The Fund will pay or cause to be paid:

            (i)  all expenses in connection with the registration
                 of Shares under the federal securities laws, and the Fund will
                 exercise its best efforts to obtain said registration and
                 qualification;

            (ii) all expenses in connection with the printing of
                 any notices of shareholders' meetings, proxy and proxy
                 statements and enclosures therewith, as well as any other
                 notice or communication sent to shareholders in connection
                 with any meeting of the shareholders or otherwise, any annual,
                 semiannual or other reports or communications sent to the
                 shareholders, and the expenses of sending prospectuses
                 relating to the Shares to existing shareholders;

           (iii) all expenses of any federal or state original-issue tax or
                 transfer tax payable upon the issuance, transfer or delivery
                 of Shares from the Fund to the Distributor; and

            (iv) the cost of preparing and issuing any Share
                 certificates which may be issued to represent Shares.

            (b) The Distributor will pay the costs and expenses of qualifying
and maintaining qualification of the Shares for sale under the securities laws
of various states.  The Distributor will also permit its officers and employees
to serve without compensation as trustees and officers of the Fund if duly
elected to such positions.
        
     6.  Redemption of Shares.  In connection with the Fund's redemption of its
Shares, the Fund hereby authorizes the Distributor to repurchase, upon the
terms and conditions hereinafter set forth, as the Fund's agent and for the
Fund's account, such Shares as may be offered for sale to the Fund from time to
time by holders of such Shares or their agents.

            (a)  Subject to and in conformity with all applicable federal and
state legislation, any applicable rules of the National Association of
Securities Dealers, Inc., and any applicable rules and regulations of the
Securities and Exchange Commission under the 1940 Act, the Distributor may
accept offers of holders of Shares to resell such Shares to the Fund on such
terms and conditions and at such prices as described and provided for in the
then current Prospectus of the Fund.
        
            (b)  The Distributor agrees to notify the Fund at such times as
the Fund may specify of the number of each class of Shares repurchased for the
Fund's account and the time or times of such repurchases, and the Fund shall
notify the Distributor of the prices applicable to repurchases of Shares of
such class.
        
            (c)  The Fund shall have the right to suspend or revoke the
foregoing authorization at any time; unless otherwise stated, any such
suspension or revocation shall be effective forthwith upon receipt of notice
thereof by telegraph or by written instrument from any of the Fund's officers. 
In the event that the Distributor's authorization is, by the terms of such
notice, suspended for more than 
        
                                      2

<PAGE>   3


twenty-four hours or until further notice, the authorization given by this
Section 6 shall not be revived except by vote of the Board of Trustees of the
Fund.
        
            (d)  The Distributor agrees that all repurchases of Shares made by
the Distributor shall be made only as agent for the Fund's account and pursuant
to the terms and conditions herein set forth.
        
            (e)  The Fund agrees to authorize and direct its Custodian to pay,
for the Fund's account, the repurchase price (together with any applicable
contingent deferred sales charge) of any Shares so repurchased for the Fund
against the authorized transfer of book shares from an open account and against
delivery of any other documentation required by the Board of Trustees of the
Fund or, in the case of certificated Shares, against delivery of the
certificates representing such Shares in proper form for transfer to the Fund.
        
            (f)  The Distributor shall receive no commissions or other 
compensation in respect of any repurchases of Shares for the Fund under the
foregoing authorization and appointment as agent.
        
     7.  Indemnification.  The Fund agrees to indemnify and hold harmless the
Distributor and each of its trustees and officers and each person, if any, who
controls the Distributor within the meaning of Section 15 of the 1933 Act
against any loss, liability, claim, damage or expense (including the reasonable
cost of investigating or defending any alleged loss, liability, claim, damage,
or expense and reasonable counsel fees incurred in connection therewith),
arising by reason of any person acquiring any Shares, based upon the ground
that the registration statement, Prospectus, shareholder reports or other
information filed or made public by the Fund (as from time to time amended)
included an untrue statement of a material fact or omitted to state a material
fact required to be stated or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading under the 1933 Act or any other statute or the common law.  However,
the Fund does not agree to indemnify the Distributor or hold it harmless to the
extent that the statement or omission was made in reliance upon, and in
conformity with, information furnished to the Fund by or on behalf of the
Distributor.  In no case (i) is the indemnity of the Fund in favor of the
Distributor or any person indemnified to be deemed to protect the Distributor
or any person against any liability to the Fund or its securityholders to which
the Distributor or such person would otherwise be subject by reason of willful
misfeasance, bad faith or gross negligence in the performance of its duties or
by reason of its reckless disregard of its obligations and duties under this
Agreement, or (ii) is the Fund to be liable under its indemnity agreement
contained in this Section with respect to any claim made against the
Distributor or any person indemnified unless the Distributor or any such person
shall have notified the Fund in writing of the claim within a reasonable time
after the summons or other first written notification giving information of the
nature of the claim shall have been served upon the Distributor or any such
person (or after the Distributor or the person shall have received notice of
service on any designated agent).  However, failure to notify the Fund of any
claim shall not relieve the Fund from any liability which it may have to the
Distributor or any person against whom such action is brought otherwise than on
account of its indemnity agreement contained in this paragraph.  The Fund shall
be entitled to participate at its own expense in the defense, or, if it so
elects, to assume the defense, of any suit brought to enforce any claims, but
if the Fund elects to assume the defense, the defense shall be conducted by
counsel chosen by it and satisfactory to the Distributor or person or persons,
defendant or defendants in the suit.  In the event the Fund elects to assume
the defense of any suit and retain counsel, the Distributor, officers or
trustees or controlling person or persons, defendant or defendants in the suit,
shall bear the fees and expenses of any additional counsel retained by them.
If the Fund does not elect to assume the defense of any suit, it will reimburse
the Distributor, officers or trustees or controlling person or persons,
defendant or defendants in the suit for the reasonable fees and expenses of any
counsel retained by them.  The Fund agrees to notify the Distributor promptly
of the commencement of any litigation or proceedings against it or any of its
officers or directors in connection with the issuance or sale of any of the
Shares.
        
     The Distributor also covenants and agrees that it will indemnify and hold
harmless the Fund and each of its trustees and officers and each person, if
any, who controls the Fund within the meaning of Section 15 of the 1933 Act
against any loss, liability, damage, claim or expense (including the reasonable
cost of investigating or defending any alleged loss, liability, damage, claim
or expense and

                                      3

<PAGE>   4



reasonable counsel fees incurred in connection therewith) arising by reason of
any person acquiring any Shares, based upon the 1933 Act or any other statute
or common law, alleging any wrongful act of the Distributor or any of its
employees or alleging that the registration statement, Prospectus, shareholder
reports or other information filed or made public by the Fund (as from time to
time amended) included an untrue statement of a material fact or omitted to
state a material fact required to be stated or necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading, insofar as the statement or omission was made in reliance upon,
and in conformity with, information furnished to the Fund by or on behalf of
the Distributor.  In no case (i) is the indemnity of the Distributor in favor
of the Fund or any person indemnified to be deemed to protect the Fund or any
such person against any liability to which the Fund or such person would
otherwise be subject by reason of willful misfeasance, bad faith or gross
negligence in the performance of its duties or by reason of its reckless
disregard of its obligation and duties under this Amended Agreement, or (ii) is
the Distributor to be liable under its indemnity agreement contained in this
paragraph with respect to any claim made against the Fund or any person
indemnified unless the Fund or person, as the case may be, shall have notified
the Distributor in writing of the claim within a reasonable time after the
summons or other first written notification giving information of the nature of
the claim shall have been served upon the Fund or person (or after the Fund or
such person shall have received notice of service on any designated agent). 
However, failure to notify the Distributor of any claim shall not relieve the
Distributor from any liability which it may have to the Fund or any person
against whom the action is brought otherwise than on account of its indemnity
agreement contained in this paragraph.  In the case of any notice to the
Distributor, it shall be entitled to participate, at its own expense, in the
defense, or, if it so elects, to assume the defense, of any suit brought to
enforce the claim, but if the Distributor elects to assume the defense, the
defense shall be conducted by counsel chosen by it and satisfactory to the
Fund, to its officers and trustees and to any controlling person or persons,
defendant or defendants in the suit.  In the event that the Distributor elects
to assume the defense of any suit and retain counsel, the Fund or controlling
persons, defendants in the suit, shall bear the fees and expenses of any
additional counsel retained by them.  If the Distributor does not elect to
assume the defense of any suit, it will reimburse the Fund, officers and
trustees or controlling person or persons, defendant or defendants in the suit,
for the reasonable fees and expenses of any counsel retained by them.  The
Distributor agrees to notify the Fund promptly of the commencement of any
litigation or proceedings against it in connection with the issue and   sale of
any of the Shares.

     8.  Continuation, Amendment or Termination of This Agreement.  This
Agreement shall become effective on the Effective Date and thereafter shall
continue in full force and effect year to year with respect to each class of
Shares so long as such continuance is approved at least annually (i) by the
Board of Trustees of the Fund or by a vote of a majority of the outstanding
voting securities of the respective class of Shares of the Fund, and (ii) by
vote of a majority of the Trustees who are not parties to this Agreement or
interested persons in any such party (the "Independent Trustee") cast in person
at a meeting called for the purpose of voting on such approval, provided,
however, that (a) this Agreement may at any time be terminated with respect to
either class of Shares of the Fund without the payment of any penalty either by
vote of a majority of the Disinterested Trustees, or by vote of a majority of
the outstanding voting securities of the respective class of Shares of the
Fund, on written notice to the Distributor; (b) this Agreement shall
immediately terminate in the event of its assignment; and (c) this Agreement
may be terminated by the Distributor on ninety (90) days' written notice to the
Fund.  Upon termination of this Agreement with respect to either class of
Shares of the Fund, the obligations of the parties hereunder shall cease and
terminate with respect to such class of Shares as of the date of such
termination, except for any obligation to respond for a breach of this
Agreement committed prior to such termination.

     This Agreement may be amended with respect to either class of Shares at
any time by mutual consent of the parties, provided that such consent on the
part of the Fund shall have been approved (i) by the Board of Trustees of the
Fund, or by a vote of the majority of the outstanding voting securities of the
respective class of Shares of the Fund, and (ii) by vote of a majority of the
Independent Trustees cast in person at a meeting called for the purpose of
voting on such amendment.

     For the purpose of this section, the terms "vote of a majority of the
outstanding voting securities", "interested persons" and "assignment" shall
have the meanings defined in the 1940 Act, as amended.

                                      4

<PAGE>   5


     9.   Limited Liability of Shareholder.  Notwithstanding anything to the
contrary contained in this Agreement, you acknowledge and agree that, as
provided by Section 8.1 of the Agreement and Declaration of Trust of the Trust,
this Agreement is executed by the Trustees of the Trust and/or Officers of the
Fund by them not individually but as such Trustees and/or Officers, and the
obligations of the Fund hereunder are not binding upon any of the Trustees,
Officers or Shareholders individually, but bind only the trust estate.

     10.  Notice.  Any notice under this Agreement shall be given in writing,
addressed and delivered, or mailed postpaid, to the other party at any office
of such party or at such other address as such party shall have designated in
writing.

     11.  GOVERNING LAW.  THIS AGREEMENT SHALL BE CONSTRUED AND ENFORCED IN
ACCORDANCE WITH, AND THE RIGHTS OF THE PARTIES HERETO SHALL BE GOVERNED BY, THE
LAW OF THE STATE OF ILLINOIS WITHOUT REFERENCE TO PRINCIPLES OF CONFLICT OF
LAWS.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their officers designated below on the day and year first above
written.

                              THE EXPLORER INSTITUTIONAL TRUST, on behalf of
                              its sub-trust, the EXPLORER INSTITUTIONAL ACTIVE
                              CORE FUND


                              By:  /s/ Dennis J. McDonnell
                                  ------------------------------------
                                  Name: Dennis J. McDonnell
                                  Title: President


                              VAN  KAMPEN AMERICAN CAPITAL DISTRIBUTORS, INC.



                              By:  /s/ Ronald A. Nyberg
                                  ------------------------------------
                                   Name: Ronald A. Nyberg
                                   Title: Executive Vice President


                                      5




<PAGE>   1
                                                                    EXHIBIT 6(b)

                             DISTRIBUTION AGREEMENT


     THIS DISTRIBUTION AGREEMENT dated as of May 31, 1997 (the "Agreement")
by and between the THE EXPLORER INSTITUTIONAL TRUST, a Massachusetts business
trust (the "Trust"), on behalf of its sub-trust, the EXPLORER INSTITUTIONAL
LIMITED DURATION FUND (the "Fund"), and VAN KAMPEN AMERICAN CAPITAL
DISTRIBUTORS, INC., a Delaware corporation (the "Distributor").

     1.  Appointment of Distributor.  The Fund appoints the Distributor as a
principal underwriter and exclusive distributor of each class of its shares of
beneficial interest (the "Shares") offered for sale from time to time pursuant
to the then current prospectus of the Fund.  The Fund reserves the right to
refuse at any time or times to sell Shares hereunder for any reason deemed
adequate by the Board of Trustees of the Fund.

     The Distributor will use its best efforts to sell, through its
organization and through other dealers and agents, the Shares which the
Distributor has the right to purchase under Section 2 hereof, but the
Distributor does not undertake to sell any specific number of Shares.

     The Distributor agrees that it will not take any long or short positions
in the Shares, except for long positions in those Shares purchased by the
Distributor in accordance with any systematic sales plan described in the then
current Prospectus of the Fund and except as permitted by Section 2 hereof, and
that so far as it can control the situation, it will prevent any of its
trustees, officers or shareholders from taking any long or short positions in
the Shares, except for legitimate investment purposes.

     2.  Sale of Shares to Distributor.  The Fund hereby grants to the
Distributor the exclusive right, except as herein otherwise provided, to
purchase Shares directly from the Fund upon the terms herein set forth.

     The Distributor shall have the right to buy from the Fund the Shares
needed, but not more than the Shares needed (except for reasonable allowances
for clerical errors, delays and errors of transmission and cancellation of
orders) to fill unconditional orders for Shares received by the Distributor
from dealers, agents and investors during each period when particular net asset
values and public offering prices are in effect as provided in Section 3
hereof; and the price which the Distributor shall pay for the Shares so
purchased shall be the respective net asset value used in determining the
public offering price on which such orders were based.  The Distributor shall
notify the Fund at the end of each such period, or as soon thereafter on that
business day as the orders received in such period have been compiled, of the
number of Shares of each class that the Distributor elects to purchase
hereunder.

     3.  Public Offering Price.  The public offering price per Share shall be
determined in accordance with the then current Prospectus of the Fund.  In no
event shall the public offering price exceed the net asset value per Share.
The net asset value per share for each class of Shares, respectively, shall be
determined in the manner provided in the Declaration of Trust and By-Laws of
the Trust as then amended, the Certificate of Designation with respect to the
Fund, as amended, and in accordance with the then current Prospectus of the
Fund. The Fund will cause immediate notice to be given to the Distributor of
each change in net asset value as soon as it is determined.

     4.  Compliance with NASD Rules, SEC Orders, etc.  In selling Fund Shares,
the Distributor will in all respects duly comply with all state and federal
laws relating to the sale of such securities and with all applicable rules and
regulations of all regulatory bodies, including without limitation the Rules of
Fair Practice of the National Association of Securities Dealers, Inc., and all
applicable rules and regulations of the Securities and Exchange Commission
under the 1940 Act, and will indemnify and save the Fund harmless from any
damage or expense on account of any unlawful act by the Distributor or its
agents or employees.  The Distributor is not, however, to be responsible for
the acts of other dealers or agents, except to the extent that they shall be
acting for the Distributor or under its direction or authority.  None of the
Distributor, any dealer, any agent or any other person is authorized by the
Fund to give any

                                      1

<PAGE>   2


information or to make any representations, other than those contained in the
Registration Statement or Prospectus heretofore or hereafter filed with the
Securities and Exchange Commission under the Securities Act of 1933, as amended
(the "1933 Act") (as any such Registration Statement and Prospectus may have
been or may be amended from time to time), covering the Shares, and in any
supplemental information to any such Prospectus approved by the Fund in
connection with the offer or sale of Shares.  None of the Distributor, any
dealer, any broker or any other person is authorized to act as agent for the
Fund in connection with the offering or sale of Shares to the public or
otherwise.  All such sales shall be made by the Distributor as principal for
its own account.
        
     5.  Expenses.

            (a) The Fund will pay or cause to be paid:

            (i)  all expenses in connection with the registration of Shares
                 under the federal securities laws, and the Fund will exercise  
                 its best efforts to obtain said registration and
                 qualification;
        
            (ii) all expenses in connection with the printing of any notices
                 of shareholders' meetings, proxy and proxy statements and
                 enclosures therewith, as well as any other notice or
                 communication sent to shareholders in connection with any
                 meeting of the shareholders or otherwise, any annual,
                 semiannual or other reports or communications sent to the
                 shareholders, and the expenses of sending prospectuses
                 relating to the Shares to existing shareholders;
        
           (iii) all expenses of any federal or state original-issue tax or
                 transfer tax payable upon the issuance, transfer or delivery
                 of Shares from the Fund to the Distributor; and
        
            (iv) the cost of preparing and issuing any Share certificates 
                 which may be issued to represent Shares.

            (b) The Distributor will pay the costs and expenses of qualifying
and maintaining qualification of the Shares for sale under the securities laws
of various states.  The Distributor will also permit its officers and employees
to serve without compensation as trustees and officers of the Fund if duly
elected to such positions.
        
     6.  Redemption of Shares.  In connection with the Fund's redemption of its
Shares, the Fund hereby authorizes the Distributor to repurchase, upon the
terms and conditions hereinafter set forth, as the Fund's agent and for the
Fund's account, such Shares as may be offered for sale to the Fund from time to
time by holders of such Shares or their agents.

            (a)  Subject to and in conformity with all applicable federal and
state legislation, any applicable rules of the National Association of
Securities Dealers, Inc., and any applicable rules and regulations of the
Securities and Exchange Commission under the 1940 Act, the Distributor may
accept offers of holders of Shares to resell such Shares to the Fund on such
terms and conditions and at such prices as described and provided for in the
then current Prospectus of the Fund.

            (b)  The Distributor agrees to notify the Fund at such times as 
the Fund may specify of the number of each class of Shares repurchased for the
Fund's account and the time or times of such repurchases, and the Fund shall
notify the Distributor of the prices applicable to repurchases of Shares of
such class.
        
            (c)  The Fund shall have the right to suspend or revoke the
foregoing authorization at any time; unless otherwise stated, any such
suspension or revocation shall be effective forthwith upon receipt of notice
thereof by telegraph or by written instrument from any of the Fund's officers. 
In the event that the Distributor's authorization is, by the terms of such
notice, suspended for more than 

                                      2

<PAGE>   3


twenty-four hours or until further notice, the authorization given by this
Section 6 shall not be revived except by vote of the Board of Trustees of the
Fund.
        
            (d)  The Distributor agrees that all repurchases of Shares made by 
the Distributor shall be made only as agent for the Fund's account and pursuant
to the terms and conditions herein set forth.
        
            (e)  The Fund agrees to authorize and direct its Custodian to pay,
for the Fund's account, the repurchase price (together with any applicable
contingent deferred sales charge) of any Shares so repurchased for the Fund
against the authorized transfer of book shares from an open account and against
delivery of any other documentation required by the Board of Trustees of the
Fund or, in the case of certificated Shares, against delivery of the
certificates representing such Shares in proper form for transfer to the Fund.
                
            (f)  The Distributor shall receive no commissions or other 
compensation in respect of any repurchases of Shares for the Fund under the
foregoing authorization and appointment as agent.
        
     7.  Indemnification.  The Fund agrees to indemnify and hold harmless the
Distributor and each of its trustees and officers and each person, if any, who
controls the Distributor within the meaning of Section 15 of the 1933 Act
against any loss, liability, claim, damage or expense (including the reasonable
cost of investigating or defending any alleged loss, liability, claim, damage,
or expense and reasonable counsel fees incurred in connection therewith),
arising by reason of any person acquiring any Shares, based upon the ground
that the registration statement, Prospectus, shareholder reports or other
information filed or made public by the Fund (as from time to time amended)
included an untrue statement of a material fact or omitted to state a material
fact required to be stated or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading under the 1933 Act or any other statute or the common law.  However,
the Fund does not agree to indemnify the Distributor or hold it harmless to the
extent that the statement or omission was made in reliance upon, and in
conformity with, information furnished to the Fund by or on behalf of the
Distributor.  In no case (i) is the indemnity of the Fund in favor of the
Distributor or any person indemnified to be deemed to protect the Distributor
or any person against any liability to the Fund or its securityholders to which
the Distributor or such person would otherwise be subject by reason of willful
misfeasance, bad faith or gross negligence in the performance of its duties or
by reason of its reckless disregard of its obligations and duties under this
Agreement, or (ii) is the Fund to be liable under its indemnity agreement
contained in this Section with respect to any claim made against the
Distributor or any person indemnified unless the Distributor or any such person
shall have notified the Fund in writing of the claim within a reasonable time
after the summons or other first written notification giving information of the
nature of the claim shall have been served upon the Distributor or any such
person (or after the Distributor or the person shall have received notice of
service on any designated agent).  However, failure to notify the Fund of any
claim shall not relieve the Fund from any liability which it may have to the
Distributor or any person against whom such action is brought otherwise than on
account of its indemnity agreement contained in this paragraph.  The Fund shall
be entitled to participate at its own expense in the defense, or, if it so
elects, to assume the defense, of any suit brought to enforce any claims, but
if the Fund elects to assume the defense, the defense shall be conducted by
counsel chosen by it and satisfactory to the Distributor or person or persons,
defendant or defendants in the suit.  In the event the Fund elects to assume
the defense of any suit and retain counsel, the Distributor, officers or
trustees or controlling person or persons, defendant or defendants in the suit,
shall bear the fees and expenses of any additional counsel retained by them.
If the Fund does not elect to assume the defense of any suit, it will reimburse
the Distributor, officers or trustees or controlling person or persons,
defendant or defendants in the suit for the reasonable fees and expenses of any
counsel retained by them.  The Fund agrees to notify the Distributor promptly
of the commencement of any litigation or proceedings against it or any of its
officers or directors in connection with the issuance or sale of any of the
Shares.
        
     The Distributor also covenants and agrees that it will indemnify and hold
harmless the Fund and each of its trustees and officers and each person, if
any, who controls the Fund within the meaning of Section 15 of the 1933 Act
against any loss, liability, damage, claim or expense (including the reasonable
cost of investigating or defending any alleged loss, liability, damage, claim
or expense and 

                                      3

<PAGE>   4


reasonable counsel fees incurred in connection therewith) arising by reason of
any person acquiring any Shares, based upon the 1933 Act or any other statute
or common law, alleging any wrongful act of the Distributor or any of its
employees or alleging that the registration statement, Prospectus, shareholder
reports or other information filed or made public by the Fund (as from time to
time amended) included an untrue statement of a material fact or omitted to
state a material fact required to be stated or necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading, insofar as the statement or omission was made in reliance upon,
and in conformity with, information furnished to the Fund by or on behalf of
the Distributor.  In no case (i) is the indemnity of the Distributor in favor
of the Fund or any person indemnified to be deemed to protect the Fund or any
such person against any liability to which the Fund or such person would
otherwise be subject by reason of willful misfeasance, bad faith or gross
negligence in the performance of its duties or by reason of its reckless
disregard of its obligation and duties under this Amended Agreement, or (ii) is
the Distributor to be liable under its indemnity agreement contained in this
paragraph with respect to any claim made against the Fund or any person
indemnified unless the Fund or person, as the case may be, shall have notified
the Distributor in writing of the claim within a reasonable time after the
summons or other first written notification giving information of the nature of
the claim shall have been served upon the Fund or person (or after the Fund or
such person shall have received notice of service on any designated agent). 
However, failure to notify the Distributor of any claim shall not relieve the
Distributor from any liability which it may have to the Fund or any person
against whom the action is brought otherwise than on account of its indemnity
agreement contained in this paragraph.  In the case of any notice to the
Distributor, it shall be entitled to participate, at its own expense, in the
defense, or, if it so elects, to assume the defense, of any suit brought to
enforce the claim, but if the Distributor elects to assume the defense, the
defense shall be conducted by counsel chosen by it and satisfactory to the
Fund, to its officers and trustees and to any controlling person or persons,
defendant or defendants in the suit.  In the event that the Distributor elects
to assume the defense of any suit and retain counsel, the Fund or controlling
persons, defendants in the suit, shall bear the fees and expenses of any
additional counsel retained by them.  If the Distributor does not elect to
assume the defense of any suit, it will reimburse the Fund, officers and
trustees or controlling person or persons, defendant or defendants in the suit,
for the reasonable fees and expenses of any counsel retained by them.  The
Distributor agrees to notify the Fund promptly of the commencement of any
litigation or proceedings against it in connection with the issue and sale of
any of the Shares.
        
     8.  Continuation, Amendment or Termination of This Agreement.  This
Agreement shall become effective on the Effective Date and thereafter shall
continue in full force and effect year to year with respect to each class of
Shares so long as such continuance is approved at least annually (i) by the
Board of Trustees of the Fund or by a vote of a majority of the outstanding
voting securities of the respective class of Shares of the Fund, and (ii) by
vote of a majority of the Trustees who are not parties to this Agreement or
interested persons in any such party (the "Independent Trustee") cast in person
at a meeting called for the purpose of voting on such approval, provided,
however, that (a) this Agreement may at any time be terminated with respect to
either class of Shares of the Fund without the payment of any penalty either by
vote of a majority of the Disinterested Trustees, or by vote of a majority of
the outstanding voting securities of the respective class of Shares of the
Fund, on written notice to the Distributor; (b) this Agreement shall
immediately terminate in the event of its assignment; and (c) this Agreement
may be terminated by the Distributor on ninety (90) days' written notice to the
Fund.  Upon termination of this Agreement with respect to either class of
Shares of the Fund, the obligations of the parties hereunder shall cease and
terminate with respect to such class of Shares as of the date of such
termination, except for any obligation to respond for a breach of this
Agreement committed prior to such termination.

     This Agreement may be amended with respect to either class of Shares at
any time by mutual consent of the parties, provided that such consent on the
part of the Fund shall have been approved (i) by the Board of Trustees of the
Fund, or by a vote of the majority of the outstanding voting securities of the
respective class of Shares of the Fund, and (ii) by vote of a majority of the
Independent Trustees cast in person at a meeting called for the purpose of
voting on such amendment.

     For the purpose of this section, the terms "vote of a majority of the
outstanding voting securities", "interested persons" and "assignment" shall
have the meanings defined in the 1940 Act, as amended.

                                      4

<PAGE>   5


     9.   Limited Liability of Shareholder.  Notwithstanding anything to the
contrary contained in this Agreement, you acknowledge and agree that, as
provided by Section 8.1 of the Agreement and Declaration of Trust of the Trust,
this Agreement is executed by the Trustees of the Trust and/or Officers of the
Fund by them not individually but as such Trustees and/or Officers, and the
obligations of the Fund hereunder are not binding upon any of the Trustees,
Officers or Shareholders individually, but bind only the trust estate.

     10.  Notice.  Any notice under this Agreement shall be given in writing,
addressed and delivered, or mailed postpaid, to the other party at any office
of such party or at such other address as such party shall have designated in
writing.

     11.  GOVERNING LAW.  THIS AGREEMENT SHALL BE CONSTRUED AND ENFORCED IN
ACCORDANCE WITH, AND THE RIGHTS OF THE PARTIES HERETO SHALL BE GOVERNED BY, THE
LAW OF THE STATE OF ILLINOIS WITHOUT REFERENCE TO PRINCIPLES OF CONFLICT OF
LAWS.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their officers designated below on the day and year first above
written.

                              THE EXPLORER INSTITUTIONAL TRUST, on behalf of
                              its sub-trust, the EXPLORER INSTITUTIONAL LIMITED
                              DURATION FUND


                              By:  /s/ Dennis J. McDonnell
                                  -------------------------------------
                                    Name: Dennis J. McDonnelll
                                    Title: President


                              VAN  KAMPEN AMERICAN CAPITAL DISTRIBUTORS, INC.



                              By:  /s/ Ronald A. Nyberg
                                  -------------------------------------
                                    Name: Ronald A. Nyberg
                                    Title: Executive Vice President


                                      5




<PAGE>   1
                                                                EXHIBIT (8)(b)


                      TRANSFER AGENCY AND SERVICE AGREEMENT


         AGREEMENT made as of the 1st day of January, 1998 by and between THE
EXPLORER INSTITUTIONAL TRUST which is organized under the laws of the State of
Massachusetts (the "Trust") and has its principal office and place of business
at Oakbrook Terrace, Illinois, acting on behalf of its series listed on Schedule
"A" hereto (collectively, the "Funds" and each a "Fund"), and ACCESS INVESTOR
SERVICES, INC., a Delaware corporation, having its principal office at Houston,
Texas, and its principal place of business at Kansas City, Missouri ("ACCESS").

                                 R E C I T A L:

         WHEREAS, the Trust desires to appoint ACCESS as its transfer agent,
dividend disbursing agent and shareholder service agent for the Funds, and
ACCESS desires to accept such appointments;

         NOW, THEREFORE, in consideration of the mutual covenants herein
contained, the parties hereto agree as follows:

ARTICLE 1.            TERMS OF APPOINTMENT; DUTIES OF ACCESS.

         1.01 Subject to the terms and conditions set forth in this Agreement,
the Trust hereby employs and appoints ACCESS as transfer agent, dividend
disbursing agent and shareholder service agent for the Funds.

         1.02 ACCESS hereby accepts such employment and appointments and agrees
that on and after the effective date of this Agreement it will act as the
transfer agent, dividend disbursing agent and shareholder service agent for the
Funds on the terms and conditions set forth herein.

         1.03 ACCESS agrees that its duties and obligations hereunder will be
performed in a competent, efficient and workmanlike manner with due diligence in
accordance with reasonable industry practice, and that the necessary facilities,
equipment and personnel for such performance will be provided.


<PAGE>   2


         1.04 In order to assure compliance with section 1.03 and to implement a
cooperative effort to improve the quality of transfer agency and shareholder
services received by the Funds and their shareholders, ACCESS agrees to provide
and maintain quantitative performance objectives, including maximum target
turn-around times and maximum target error rates, for the various services
provided hereunder. ACCESS also agrees to provide a reporting system designed to
provide the Board of Trustees of the Trust (the "Board") on a quarterly basis
with quantitative data comparing actual performance for the period with the
performance objectives. The foregoing procedures are designed to provide a basis
for continuing monitoring by the Board of the quality of services rendered
hereunder. 

ARTICLE 2.    FEES AND EXPENSES.

         2.01 For the services to be performed by ACCESS pursuant to this
Agreement, the Funds agree to pay ACCESS the fees provided in the fee schedules
agreed upon from time to time by the Funds and ACCESS.

         2.02 In addition to the amounts paid under section 2.01 above, each
Fund agrees to reimburse ACCESS promptly for the Fund's reasonable out-of-pocket
expenses or advances paid on its behalf by ACCESS in connection with its
performance under this Agreement for postage, freight, envelopes, checks,
drafts, continuous forms, reports and statements, telephone, telegraph, costs of
outside mailing firms, necessary outside record storage costs, media for storage
of records (e.g., microfilm, microfiche and computer tapes) and printing costs
incurred due to special requirements of the Fund. In addition, any other special
out-of-pocket expenses paid by ACCESS at the specific request of the Fund will
be promptly reimbursed by the Fund. Postage for mailings of dividends, proxies,
Fund reports and other mailings to all shareholder accounts shall be advanced to
ACCESS by the Fund three business days prior to the mailing date of such
materials.




                                       2
<PAGE>   3





ARTICLE 3.            REPRESENTATIONS AND WARRANTIES OF ACCESS.

                      ACCESS represents and warrants to the Funds that:
         3.01 It is a corporation duly organized and existing and in good
standing under the laws of the State of Massachusetts.

         3.02 It is duly qualified to carry on its business in the states of
Texas and Missouri. 

         3.03 It is empowered under applicable laws and by its
charter and bylaws to enter into and perform this Agreement. 

         3.04 All requisite corporate proceedings have been taken to authorize
it to enter into and perform this Agreement.

         3.05 It has and will continue to have during the term of this Agreement
access to the necessary facilities, equipment and personnel to perform its
duties and obligations hereunder.

3.06     It will maintain a system regarding "as of" transactions as follows:

                     (a) Each "as of" transaction effected at a price other than
         that in effect on the day of processing for which an estimate has not
         been given to the Fund and which is necessitated by ACCESS' error, or
         delay for which ACCESS is responsible or which could have been avoided
         through the exercise of reasonable care, will be identified, and the
         net effect of such transactions determined, on a daily basis for a
         Fund.
                     (b) The cumulative net effect of the transactions included
         in paragraph (a) above will be determined each day throughout each
         month. If, on any day during the month, the cumulative net effect upon
         the Fund is negative and exceeds an amount equivalent to 1/2 of 1 cent
         per share of the Fund, ACCESS shall promptly make a payment to the Fund
         (in cash or through use of a credit as described in paragraph (c)
         below) in such amount as necessary to reduce the negative cumulative
         net effect to less than 1/2 of 1 cent per share of the Fund. If on the
         last business day of the month the cumulative net effect (adjusted by
         the amount of any payments pursuant to the preceding 




                                       3
<PAGE>   4

         sentence) upon the Fund is negative, the Fund shall be entitled to a
         reduction in the monthly transfer agency fee next payable by an
         equivalent amount, except as provided in paragraph (c) below. If on the
         last business day of the month the cumulative net effect (similarly
         adjusted) upon the Fund is positive, ACCESS shall be entitled to
         recover certain past payments and reductions in fees, and to a credit
         against all future payments and fee reductions made under this
         paragraph to the Fund, as described in paragraph (c) below.

                     (c) At the end of each month, any positive cumulative net
          effect upon the Fund shall be deemed to be a credit to ACCESS which
          shall first be applied to recover any payments and fee reductions made
          by ACCESS to the Fund under paragraph (b) above during the calendar
          year by increasing the amount of the monthly transfer agency fee next
          payable in an amount equal to prior payments and fee reductions made
          during such year, but not exceeding the sum of that month's credit and
          credits arising in prior months during such year to the extent such
          prior credits have not previously been utilized as contemplated by
          this paragraph (c). Any portion of a credit to ACCESS not so used
          shall remain as a credit to be used as payment against the amount of
          any future negative cumulative net effects that would otherwise
          require a payment or fee reduction to the Fund pursuant to paragraph
          (b) above.

ARTICLE 4.          REPRESENTATIONS AND WARRANTIES OF THE TRUST.

                    The Trust hereby represents and warrants that:

         4.01 It is duly organized and existing and in good standing under the
laws of the State of Massachusetts.

         4.02 It is empowered under applicable laws and regulations and by its
Agreement and Declaration of Trust and by-laws to enter into and perform this
Agreement.

         4.03 All requisite proceedings have been taken by its Board to
authorize it to enter into and perform this Agreement.




                                       4
<PAGE>   5



         4.04 It is an open-end, management investment company registered under
the Investment Company Act of 1940, as amended.

         4.05 A registration statement under the Securities Act of 1933, as
amended, is currently effective and will remain effective, and appropriate state
securities laws filings have been made and will continue to be made, with
respect to all of its shares being offered for sale. 

ARTICLE 5.    INDEMNIFICATION.

         5.01 ACCESS shall not be responsible for and the Funds shall indemnify
and hold ACCESS harmless from and against any and all losses, damages, costs,
charges, reasonable counsel fees, payments, expenses and liabilities arising out
of or attributable to:

                      (a) All actions of ACCESS required to be taken by ACCESS
         for the benefit of the Fund pursuant to this Agreement, provided ACCESS
         has acted in good faith with due diligence and without negligence or
         willful misconduct.

                      (b) The reasonable reliance by ACCESS on, or reasonable
         use by ACCESS of, information, records and documents which have been
         prepared or maintained by or on behalf of the Fund have been furnished
         to ACCESS by or on behalf of the Fund.

                      (c) The reasonable reliance by ACCESS on, or the carrying
         out by ACCESS of, any instructions or requests of the Fund.

                      (d) The offer or sale of the Fund's shares in violation of
         any requirement under the federal securities laws or regulations or the
         securities laws or regulations of any state or in violation of any stop
         order or other determination or ruling by any federal agency or any
         state with respect to the offer or sale of such shares in such state
         unless such violation results from any failure by ACCESS to comply with
         written instructions of the Fund that no offers or sales of the Fund's
         shares be made in general or to the residents of a particular state.




                                       5
<PAGE>   6



                      (e) The Fund's refusal or failure to comply with the terms
         of this Agreement, or the Fund's lack of good faith, negligence or
         willful misconduct or the breach of any representation or warranty of
         the Fund hereunder. 

         5.02 ACCESS shall indemnify and hold the Funds harmless from and
against any and all losses, damages costs, charges, reasonable counsel fees,
payments, expenses and liability arising out of or attributable to ACCESS'
refusal or failure to comply with the terms of this Agreement, or ACCESS' lack
of good faith, negligence or willful misconduct, or the breach of any
representation or warranty of ACCESS hereunder.

         5.03 At any time ACCESS may apply to any authorized officer of a Fund
for instructions, and may consult with the Fund's legal counsel, at the expense
of the Fund, with respect to any matter arising in connection with the services
to be performed by ACCESS under this Agreement, and ACCESS shall not be liable
and shall be indemnified by the Fund for any action taken or omitted by it in
good faith in reasonable reliance upon such instructions or upon the opinion of
such counsel. ACCESS shall be protected and indemnified in acting upon any paper
or document reasonably believed by ACCESS to be genuine and to have been signed
by the proper person or persons and shall not be held to have notice of any
change of authority of any person, until receipt of written notice thereof from
the Fund. ACCESS shall also be protected and indemnified in recognizing stock
certificates which ACCESS reasonably believes to bear the proper manual or
facsimile signatures of the officers of the Fund, and the proper
countersignature of any former transfer agent or registrar, or of a co-transfer
agent or co-registrar.

         5.04 In the event any party is unable to perform its obligations under
the terms of this Agreement because of acts of God, strikes, equipment or
transmission failure or damage, or other causes reasonably beyond its control,
such party shall not be liable for damages to the other for any damages
resulting from such failure to perform or otherwise from such causes.




                                       6
<PAGE>   7



         5.05 In no event and under no circumstances shall any party to this
Agreement be liable to another party for consequential damages under any
provision of this Agreement or for any act or failure to act hereunder.

         5.06 In order that the indemnification provisions contained in this
Article 5 shall apply, upon the assertion of a claim for which one party may be
required to indemnify another, the party seeking indemnification shall promptly
notify the other party of such assertion, and shall keep the other party advised
with respect to all developments concerning such claim. The party who may be
required to indemnify shall have the option to participate with the party
seeking indemnification in the defense of such claim. The party seeking
indemnification shall in no case confess any claim or make any compromise in any
case in which the other party may be required to indemnify it except with the
other party's prior written consent.

ARTICLE 6.          COVENANTS OF THE TRUST AND ACCESS.

         6.01 The Trust shall promptly furnish to ACCESS the following:

                      (a) Certified copies of the resolution of its Board
         authorizing the appointment of ACCESS and the execution and delivery of
         this Agreement.

                      (b) Certified copies of its Agreement and Declaration of
         Trust and by-laws and all amendments thereto. 

         6.02 ACCESS hereby agrees to maintain facilities and procedures
reasonably acceptable to the Funds for safekeeping of share certificates, check
forms and facsimile signature imprinting devices, if any; and for the
preparation or use, and for keeping account of, such certificates, forms and
devices.
         
         6.03 ACCESS shall keep records relating to the services to be performed
hereunder, in the form and manner as it may deem advisable; provided, however,
that all accounts, books and other records of the Funds (hereinafter referred to
as "Fund Records") prepared or maintained by ACCESS hereunder





                                       7
<PAGE>   8


shall be maintained and kept current in compliance with Section 31 of
the Investment Company Act of 1940 and the Rules thereunder (such Section and
Rules being hereinafter referred to as the "1940 Act Requirements"). To the
extent required by the 1940 Act Requirements, ACCESS agrees that all Fund
Records prepared or maintained by ACCESS hereunder are the property of the Fund
and shall be preserved and made available in accordance with the 1940 Act
Requirements, and shall be surrendered promptly to a Fund on its request. ACCESS
agrees at such reasonable times as may be requested by the Board and at least
quarterly to provide (i) written confirmation to the Board that all Fund Records
are maintained and kept current in accordance with the 1940 Act Requirements,
and (ii) such other reports regarding its performance hereunder as may be
reasonably requested by the Board.

         6.04 ACCESS and the Funds agree that all books, records, information
and data pertaining to the business of the other party which are exchanged or
received pursuant to the negotiation or the carrying out of this Agreement shall
remain confidential, and shall not be voluntarily disclosed to any other person,
except as may be required by law.

         6.05 In case of any requests or demands for the inspection of any of
the Fund Records, ACCESS will endeavor to notify the Fund and to secure
instructions from an authorized officer of the Fund as to such inspection.
ACCESS reserves the right, however, to exhibit such Fund Records to any person
whenever it is advised by its counsel that it may be held liable for the failure
to exhibit such Fund Records to such person. 

ARTICLE 7.    TERM AND TERMINATION OF AGREEMENT

         7.01 The initial term of this Agreement shall expire June 30, 1999, and
thereafter this Agreement shall automatically be renewed for successive one year
periods to begin on July 1 of each year unless any party provides notice to the
other party at least 30 days in advance of that date that this Agreement is not
to be renewed.



                                       8
<PAGE>   9



         7.02 Notwithstanding the foregoing, any party may terminate this
Agreement for good and reasonable cause at any time by giving written notice to
the other party at least 120 days prior to the date on which such termination is
to be effective.

         7.03 Any unpaid fees or reimbursable expenses payable to ACCESS at the
termination date of this Agreement shall be due on that termination date. ACCESS
agrees to use its best efforts to cooperate with the Funds and the successor
transfer agent or agents in accomplishing an orderly transition.

ARTICLE 8.    MISCELLANEOUS.

         8.01 Except as provided in section 8.03 below, neither this Agreement
nor any rights or obligations hereunder may be assigned by any party without the
written consent of ACCESS or the Trust, as the case may be; provided, however,
that no consent shall be required for any merger of a Fund with, or any sale of
all or substantially all the assets of a Fund to, another investment company.

         8.02 This Agreement shall inure to the benefit of and be binding upon
the parties and their respective permitted successors and assigns.

         8.03 ACCESS may, without further consent on the part of a Fund,
subcontract with DST, Inc., a Missouri corporation, or any other qualified
servicer, for the performance of data processing activities; provided, however,
that ACCESS shall be as fully responsible to the Fund for the acts and omissions
of DST, Inc., or other qualified servicer, as it is for its own acts and
omissions.

         8.04 ACCESS may, without further consent on the part of a Fund, provide
services to its affiliated companies. Such services may be provided at cost.

         8.05 This Agreement constitutes the entire agreement between the
parties hereto with respect to the subject matter hereof, and supersedes any
prior agreement with respect thereto, whether oral or written, and this
Agreement may not be modified except by written instrument executed by the
affected parties.



                                       9
<PAGE>   10



         8.06 The execution of this Agreement has been authorized by the Trust's
Trustees. This Agreement is executed on behalf of the Trust's or the Trustees of
the Trust's as Trustees and not individually and the obligations of this
Agreement are not binding upon any of the Trustees, officers or shareholders of
the Trust's individually but are binding only upon the assets and property of
the Trust's. An Agreement and Declaration of Trust in respect of the Trust's is
on file with the Secretary of State of Massachusetts.

         8.07 In the event of a change in the business or regulatory environment
affecting all or any portion of this Agreement, the parties hereto agree to
renegotiate such affected portions in good faith.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
in their names and on their behalf and through their duly authorized officers,
as of the date first above written.

                                        THE EXPLORER INSTITUTIONAL TRUST

                                        BY: /s/ Ronald A. Nyberg
                                            ______________________             
                                        NAME:   Ronald A. Nyberg
                                             _____________________        
                                        ITS:  Vice President, Secretary

ATTEST:

/s/ Weston B. Wetherell
_______________________
 Assistant Secretary

                                        ACCESS INVESTOR SERVICES, INC.



                                        BY:  /s/ Paul R. Wolkenberg
                                           ________________________
                                             President

ATTEST:

/s/ Huey P. Falgout, Jr.
________________________
Assistant Secretary




                                       10
<PAGE>   11


                                PRICING SCHEDULE
                                ________________


                  FUND NAME                               ANNUAL CHARGE(1)
                 __________                               ______________


The Explorer Institutional Active Core Fund          $15,000 Plus Out of Pockets
The Explorer Institutional Limited Duration Fund     $15,000 Plus Out of Pockets



_____________________________
1 Minimum annual charge based on reimbursement, profit margin expense not
applied.

  New funds, when applied, will have an annual charge of $15,000 after a six
months zero grace period.



                                       11

<PAGE>   1
                                                                  EXHIBIT (9)(b)
                              AMENDED AND RESTATED
                            LEGAL SERVICES AGREEMENT

         THIS AGREEMENT, dated as of May 31, 1997, by and between the parties as
set forth in Schedule 1, attached hereto and incorporated by reference
(designated collectively hereafter as the "Funds"), and VAN KAMPEN AMERICAN
CAPITAL, INC., a Delaware corporation ("Van Kampen").

                              W I T N E S S E T H:

         WHEREAS, each of the Funds is registered as a management investment
company under the Investment Company Act of 1940, as amended (the "1940 Act");
and

         WHEREAS, Van Kampen has the capability of providing certain legal 
services to the Funds; and

         WHEREAS, each Fund desires to utilize Van Kampen in the provision of 
such legal services; and

         WHEREAS, Van Kampen intends to increase its staff in order to
accommodate the provision of all such services.

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants spelled out herein, it is agreed between the parties hereto as
follows:

1.       Appointment of Van Kampen. As agent, Van Kampen shall provide each of 
the Funds the legal services (the "Legal Services") as set forth in Paragraph 2
of this Agreement. Van Kampen accepts such appointments and agrees to furnish
the Legal Services in return for the compensation provided in Paragraph 3 of
this Agreement.

2.       Legal Services to be Provided. Van Kampen will provide to the Funds the
following legal services, including without limitation: accurate maintenance of
the Funds' Corporate Minute books and records, preparation and oversight of each
Fund's regulatory reports and other information provided to shareholders as well
as responding to day-to-day legal issues on behalf of the Funds. Van Kampen
shall hire persons (collectively the "Legal Services Group") as needed to
provide such Legal Services and in such numbers as may be agreed from time to
time.

3.       Expenses and Reimbursement. The Legal Services expenses (the "Legal 
Services Expenses") for which Van Kampen may be reimbursed are salary and salary
related benefits, including but not limited to bonuses, group insurance and
other regular wages paid to the personnel of the Legal Services Group, as well
as overhead and expenses related to office space and necessary equipment. The
Legal Services Expenses will be paid by Van Kampen and reimbursed by the Funds.
Van Kampen will 


<PAGE>   2



tender to each Fund a monthly invoice as of the last business day of each month
which shall certify the total Legal Service Expenses expended. Except as
provided herein, Van Kampen will receive no other compensation in connection
with Legal Services rendered in accordance with this Agreement, and Van Kampen
will be responsible for all other expenses relating to the providing of Legal
Services.

4.       Payment for Legal Services Expense Among the Funds. One half (50%) of 
the Legal Services Expenses incurred under the Agreement shall be attributable
equally to each respective Fund and all other funds to whom Van Kampen provides
Legal Services, including all other Funds for which Van Kampen serves as
investment adviser and distributor. Van Kampen shall assume the costs of Legal
Services for the Non-Participating Funds for which reimbursement is not
received. The remaining one half (50%) of the Legal Services Expenses shall be
in allocated (a) in the event services are attributable to specific funds
(including the Non-Participating Funds) based on such specific time allocations;
and (b) in the event services are attributable only to types of funds (i.e.
closed-end and open-end funds), the relative amount of time spent on each type
of fund and then further allocated between funds of that type on the basis of
relative net assets at the end of the period.

5.       Maintenance of Records. All records maintained by Van Kampen in 
connection with the performance of its duties under this Agreement will remain
the property of each respective Fund and will be preserved by Van Kampen for the
periods prescribed in Section 31 of the 1940 Act and the rules thereunder or
such other applicable rules that may be adopted from time to time under the Act.
In the event of termination of the Agreement, such records will be promptly
delivered to the respective Funds. Such records may be inspected by the
respective Funds at reasonable times.

6.       Liability of Van Kampen. Van Kampen shall not be liable to any Fund for
any action taken or thing done by it or its agents or contractors on behalf of
the Fund in carrying out the terms and provisions of the Agreement if done in
good faith and without negligence or misconduct on the part of Van Kampen, its
agents or contractors.

7.       Indemnification By Funds. Each Fund will indemnify and hold Van Kampen
harmless from all loss, cost, damage and expense, including reasonable expenses
for legal counsel, incurred by Van Kampen resulting from (a) any claim, demand,
action or suit in connection with Van Kampen's acceptance of this Agreement; (b)
an action or omission by Van Kampen in the performance of its duties hereunder;
(c) Van Kampen's acting upon instructions believed by it to have been executed
by a duly authorized officer of the Fund; or (d) Van Kampen's acting upon
information provided by the Fund in form and under policies agreed to by Van
Kampen and the Fund. Van Kampen shall not be entitled to such indemnification in
respect of action or omissions constituting negligence or willful misconduct of
Van Kampen or its agents or contractors. Prior to admitting any claim against it
which may be subject to this indemnification, Van Kampen shall give the Fund
reasonable opportunity to defend against said claim on its own name or in the
name of Van Kampen.

<PAGE>   3


8.       Indemnification By Van Kampen. Van Kampen will indemnify and hold 
harmless each Fund from all loss, cost, damage and expense, including reasonable
expenses for legal counsel, incurred by the Fund resulting from any claim,
demand, action or suit arising out of Van Kampen's failure to comply with the
terms of this Agreement or which arises out of the negligence or willful
misconduct of Van Kampen or its agents or contractors; provided, that such
negligence or misconduct is not attributable to the Funds, their agents or
contractors. Prior to admitting any claim against it which may be subject to
this indemnification, the Fund shall give Van Kampen reasonable opportunity to
defend against said claim in its own name or in the name of such Fund.

9.       Further Assurances. Each party agrees to perform such further acts and
execute such further documents as necessary to effectuate the purposes hereof.

10.      Dual Interests. It is understood that some person or persons may be
directors, trustees, officers, or shareholders of both the Funds and Van Kampen
(including Van Kampen's affiliates), and that the existence of any such dual
interest shall not affect the validity hereof or of any transactions hereunder
except as otherwise provided by a specific provision of applicable law.

11.      Execution, Amendment and Termination. The term of this Agreement shall 
begin as of the date first above written, and unless sooner terminated as herein
provided, this Agreement shall remain in effect through May, 1997, and
thereafter from year to year if such continuation is specifically approved at
least annually by the Board of Trustees of each Fund, including a majority of
the independent Trustees of each Fund. The Agreement may be modified or amended
from time to time by mutual agreement between the and shall likewise reimburse
Van Kampen for its costs, expenses and disbursements payable under this
Agreement to such date. This Agreement may be amended in the future to include
as additional parties to the Agreement other investment companies for which Van
Kampen, any subsidiary or affiliate serves as investment advisor or distributor.

12.      Assignment. Any interest of Van Kampen under this Agreement shall not 
be assigned or transferred, either voluntarily or involuntarily, by operation of
law or otherwise, without the prior written consent of the Fund. This Agreement
shall automatically and immediately terminate in the event of its assignment
without the prior written consent of the Fund.

13.      Notice. Any notice under this agreement shall be in writing, addressed 
and delivered or sent by registered or certified mail, postage prepaid, to the
other party at such address as such other party may designate for the receipt of
such notices. Until further notice to the other parties, it is agreed that for
this purpose the address of each Fund is One Parkview Plaza, Oakbrook Terrace,
Illinois 60181, Attention: President and the address of Van Kampen. for this
purpose is One Parkview Plaza, Oakbrook Terrace, Illinois 60181, Attention:
General Counsel.


<PAGE>   4

14.      Personal Liability. As provided for in the Declaration of Trust of the
various Funds, under which the Funds are organized as unincorporated trusts
under the laws of the State of Delaware, Massachusetts or Pennsylvania, as the
case may be, the shareholders, trustees, officers, employees and other agents of
the Fund shall not personally be bound by or liable for the matters set forth
hereunder, nor shall resort be had to their private property for the
satisfaction of any obligation or claim hereunder.

15.      Interpretative Provisions. In connection with the operation of this
agreement, Van Kampen and the Funds may agree from time to time on such
provisions interpretative of or in addition to the provisions of this Agreement
as may in their opinion be consistent with the general tenor of this Agreement.

16.      State Law. This Agreement shall be construed and enforced in accordance
with and governed by the laws of the State of Illinois.

17.      Captions. The captions in the Agreement are included for convenience of
reference only and in no way define or limit any of the provisions hereof or
otherwise affect their construction effect.


<PAGE>   5



         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed as of the day and year first above written.


ALL OF THE PARTIES SET FORTH IN SCHEDULE 1
ATTACHED HERETO



By:      /s/ Ronald A. Nyberg                
         --------------------------
         Ronald A. Nyberg
         Vice President & Secretary


VAN KAMPEN AMERICAN CAPITAL, INC.



By:      /s/ Dennis J. McDonnell            
         --------------------------
         Dennis J. McDonnell
         Executive Vice President



<PAGE>   6


                                   SCHEDULE 1

1.       VAN KAMPEN AMERICAN CAPITAL U.S. GOVERNMENT TRUST, on behalf of its
         series, Van Kampen American Capital U.S. Government Fund

2.       VAN KAMPEN AMERICAN CAPITAL TAX FREE TRUST, on behalf of its series,
         Van Kampen American Capital Insured Tax Free Income Fund, Van Kampen
         American Capital Tax Free High Income Fund, Van Kampen American Capital
         California Insured Tax Free Fund, Van Kampen American Capital Municipal
         Income Fund, Van Kampen American Capital Intermediate Term Municipal
         Income Fund, Van Kampen American Capital New York Tax Free Income Fund,
         Van Kampen American Capital New Jersey Tax Free Income Fund, Van Kampen
         American Capital Florida Insured Tax Free Income Fund, Van Kampen
         American Capital California Tax Free Income Fund, Van Kampen American
         Capital Michigan Tax Free Income Fund, Van Kampen American Capital
         Missouri Tax Free Income Fund and Van Kampen American Capital Ohio Tax
         Free Income Fund

3.       VAN KAMPEN AMERICAN CAPITAL TRUST, on behalf of its series, Van Kampen
         American Capital High Yield Fund, Van Kampen American Capital
         Short-Term Global Income Fund and Van Kampen American Capital Strategic
         Income Fund

4.       VAN KAMPEN AMERICAN CAPITAL EQUITY TRUST, on behalf of its series, Van
         Kampen American Capital Utility Fund, Van Kampen American Capital Value
         Fund, Van Kampen American Capital Growth Fund, Van Kampen American
         Capital Great American Companies Fund, Van Kampen American Capital
         Prospector Fund and Van Kampen American Capital Aggressive Growth Fund

5.       VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA TAX FREE INCOME FUND

6.       VAN KAMPEN AMERICAN CAPITAL TAX FREE MONEY FUND

7.       VAN KAMPEN AMERICAN CAPITAL FOREIGN SECURITIES FUND

8.       VAN KAMPEN AMERICAN CAPITAL MUNICIPAL INCOME TRUST

9.       VAN KAMPEN AMERICAN CAPITAL CALIFORNIA MUNICIPAL TRUST

10.      VAN KAMPEN AMERICAN CAPITAL HIGH INCOME TRUST

11.      VAN KAMPEN AMERICAN CAPITAL HIGH INCOME TRUST II

12.      VAN KAMPEN AMERICAN CAPITAL PRIME RATE INCOME TRUST

13.      VAN KAMPEN AMERICAN CAPITAL INVESTMENT GRADE MUNICIPAL TRUST

14.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL TRUST

15.      VAN KAMPEN AMERICAN CAPITAL CALIFORNIA QUALITY MUNICIPAL TRUST

16.      VAN KAMPEN AMERICAN CAPITAL FLORIDA QUALITY MUNICIPAL TRUST

17.      VAN KAMPEN AMERICAN CAPITAL NEW YORK QUALITY MUNICIPAL TRUST

18.      VAN KAMPEN AMERICAN CAPITAL OHIO QUALITY MUNICIPAL TRUST

19.      VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA QUALITY MUNICIPAL TRUST

20.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INSURED MUNICIPALS



<PAGE>   7


21.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE MUNICIPALS

22.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE CALIFORNIA
         MUNICIPALS

23.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE FLORIDA
         MUNICIPALS

24.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE NEW JERSEY
         MUNICIPALS

25.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE NEW YORK
         MUNICIPALS

26.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE PENNSYLVANIA
         MUNICIPALS

27.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL OPPORTUNITY TRUST

28.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE MUNICIPAL INCOME TRUST

29.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE PENNSYLVANIA MUNICIPAL INCOME
         TRUST

30.      VAN KAMPEN AMERICAN CAPITAL STRATEGIC SECTOR MUNICIPAL TRUST

31.      VAN KAMPEN AMERICAN CAPITAL VALUE MUNICIPAL INCOME TRUST

32.      VAN KAMPEN AMERICAN CAPITAL CALIFORNIA VALUE MUNICIPAL INCOME TRUST

33.      VAN KAMPEN AMERICAN CAPITAL MASSACHUSETTS VALUE MUNICIPAL INCOME TRUST

34.      VAN KAMPEN AMERICAN CAPITAL NEW JERSEY VALUE MUNICIPAL INCOME TRUST

35.      VAN KAMPEN AMERICAN CAPITAL NEW YORK VALUE MUNICIPAL INCOME TRUST

36.      VAN KAMPEN AMERICAN CAPITAL OHIO VALUE MUNICIPAL INCOME TRUST

37.      VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA VALUE MUNICIPAL INCOME TRUST

38.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL OPPORTUNITY TRUST II

39.      VAN KAMPEN AMERICAN CAPITAL FLORIDA MUNICIPAL OPPORTUNITY TRUST

40.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE MUNICIPAL INCOME TRUST II

41.      VAN KAMPEN AMERICAN CAPITAL SELECT SECTOR MUNICIPAL TRUST

42.      THE EXPLORER INSTITUTIONAL TRUST, on behalf of its sub-trusts, Explorer
         Institutional Active Core Fund and Explorer Institutional Limited
         Duration Fund


<PAGE>   8



                                  AMENDMENT ONE

                                     TO THE
                  AMENDED AND RESTATED LEGAL SERVICES AGREEMENT
                               DATED JULY 2, 1997


         THIS AMENDMENT ONE to the Amended and Restated Legal Services Agreement
dated May 31, 1997 by and between the parties as set forth in Schedule 1,
attached hereto and incorporated by reference and VAN KAMPEN AMERICAN CAPITAL,
INC.

                               W I T N E S S E T H

         WHEREAS, Morgan Stanley Fund, Inc. being an open-end management
investment company as that term is defined in the Investment Company Act of
1940, as amended, wishes to become a party to the Agreement; and

         WHEREAS, the original parties desire to add the aforementioned
additional entity as a party to the Agreement;

         NOW, THEREFORE, in consideration of the promises and mutual covenants
spelled out in the Agreement and herein, it is hereby agreed that Schedule 1 of
the Agreement be amended to add Morgan Stanley Fund, Inc.



<PAGE>   9

         IN WITNESS WHEREOF, the parties have caused this Amendment One to be
executed this 31st day of May, 1997.

ALL OF THE PARTIES SET FORTH IN SCHEDULE 1
ATTACHED HERETO



By:      /s/ Ronald A. Nyberg
   ------------------------------
         Ronald A. Nyberg
         Executive Vice President


VAN KAMPEN AMERICAN CAPITAL, INC.



By:      Dennis J. McDonnell
   ------------------------------
         Dennis J. McDonnell
         Executive Vice President



MORGAN STANLEY FUND, INC.



By:      /s/ Ronald A. Nyberg
   ------------------------------
         Ronald A. Nyberg
         Vice President, Secretary



<PAGE>   10

                                   SCHEDULE 1


1.       VAN KAMPEN AMERICAN CAPITAL U.S. GOVERNMENT TRUST, on behalf of its
         series, Van Kampen American Capital U.S. Government Fund

2.       VAN KAMPEN AMERICAN CAPITAL TAX FREE TRUST, on behalf of its series,
         Van Kampen American Capital Insured Tax Free Income Fund, Van Kampen
         American Capital Tax Free High Income Fund, Van Kampen American Capital
         California Insured Tax Free Fund, Van Kampen American Capital Municipal
         Income Fund, Van Kampen American Capital Intermediate Term Municipal
         Income Fund, Van Kampen American Capital New York Tax Free Income Fund,
         Van Kampen American Capital New Jersey Tax Free Income Fund, Van Kampen
         American Capital Florida Insured Tax Free Income Fund, Van Kampen
         American Capital California Tax Free Income Fund, Van Kampen American
         Capital Michigan Tax Free Income Fund, Van Kampen American Capital
         Missouri Tax Free Income Fund and Van Kampen American Capital Ohio Tax
         Free Income Fund

3.       VAN KAMPEN AMERICAN CAPITAL TRUST, on behalf of its series, Van Kampen
         American Capital High Yield Fund, Van Kampen American Capital
         Short-Term Global Income Fund and Van Kampen American Capital Strategic
         Income Fund

4.       VAN KAMPEN AMERICAN CAPITAL EQUITY TRUST, on behalf of its series, Van
         Kampen American Capital Utility Fund, Van Kampen American Capital Value
         Fund, Van Kampen American Capital Growth Fund, Van Kampen American
         Capital Great American Companies Fund, Van Kampen American Capital
         Prospector Fund and Van Kampen American Capital Aggressive Growth Fund

5.       VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA TAX FREE INCOME FUND

6.       VAN KAMPEN AMERICAN CAPITAL TAX FREE MONEY FUND

7.       VAN KAMPEN AMERICAN CAPITAL FOREIGN SECURITIES FUND

8.       VAN KAMPEN AMERICAN CAPITAL MUNICIPAL INCOME TRUST

9.       VAN KAMPEN AMERICAN CAPITAL CALIFORNIA MUNICIPAL TRUST

10.      VAN KAMPEN AMERICAN CAPITAL HIGH INCOME TRUST

11.      VAN KAMPEN AMERICAN CAPITAL HIGH INCOME TRUST II

12.      VAN KAMPEN AMERICAN CAPITAL PRIME RATE INCOME TRUST

13.      VAN KAMPEN AMERICAN CAPITAL INVESTMENT GRADE MUNICIPAL TRUST

14.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL TRUST

15.      VAN KAMPEN AMERICAN CAPITAL CALIFORNIA QUALITY MUNICIPAL TRUST

16.      VAN KAMPEN AMERICAN CAPITAL FLORIDA QUALITY MUNICIPAL TRUST

17.      VAN KAMPEN AMERICAN CAPITAL NEW YORK QUALITY MUNICIPAL TRUST

18.      VAN KAMPEN AMERICAN CAPITAL OHIO QUALITY MUNICIPAL TRUST


<PAGE>   11


19.      VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA QUALITY MUNICIPAL TRUST

20.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INSURED MUNICIPALS

21.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE MUNICIPALS

22.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE CALIFORNIA
         MUNICIPALS

23.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE FLORIDA
         MUNICIPALS

24.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE NEW JERSEY
         MUNICIPALS

25.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE NEW YORK
         MUNICIPALS

26.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE PENNSYLVANIA
         MUNICIPALS

27.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL OPPORTUNITY TRUST

28.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE MUNICIPAL INCOME TRUST

29.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE PENNSYLVANIA MUNICIPAL INCOME
         TRUST

30.      VAN KAMPEN AMERICAN CAPITAL STRATEGIC SECTOR MUNICIPAL TRUST

31.      VAN KAMPEN AMERICAN CAPITAL VALUE MUNICIPAL INCOME TRUST

32.      VAN KAMPEN AMERICAN CAPITAL CALIFORNIA VALUE MUNICIPAL INCOME TRUST

33.      VAN KAMPEN AMERICAN CAPITAL MASSACHUSETTS VALUE MUNICIPAL INCOME TRUST

34.      VAN KAMPEN AMERICAN CAPITAL NEW JERSEY VALUE MUNICIPAL INCOME TRUST

35.      VAN KAMPEN AMERICAN CAPITAL NEW YORK VALUE MUNICIPAL INCOME TRUST

36.      VAN KAMPEN AMERICAN CAPITAL OHIO VALUE MUNICIPAL INCOME TRUST

37.      VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA VALUE MUNICIPAL INCOME TRUST

38.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL OPPORTUNITY TRUST II

39.      VAN KAMPEN AMERICAN CAPITAL FLORIDA MUNICIPAL OPPORTUNITY TRUST

40.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE MUNICIPAL INCOME TRUST II

41.      VAN KAMPEN AMERICAN CAPITAL SELECT SECTOR MUNICIPAL TRUST

43.      THE EXPLORER INSTITUTIONAL TRUST, on behalf of its sub-trusts, Explorer
         Institutional Active Core Fund and Explorer Institutional Limited
         Duration Fund

43.      MORGAN STANLEY EMERGING MARKETS DEBT FUND

44.      MORGAN STANLEY GLOBAL FIXED INCOME FUND

45.      MORGAN STANLEY HIGH YIELD FUND


<PAGE>   12

46.      MORGAN STANLEY WORLDWIDE HIGH INCOME FUND

47.      MORGAN STANLEY AMERICAN VALUE FUND

48.      MORGAN STANLEY AGGRESSIVE EQUITY FUND

49.      MORGAN STANLEY U.S. REAL ESTATE FUND

50.      MORGAN STANLEY EQUITY GROWTH FUND

51.      MORGAN STANLEY MIDCAP GROWTH FUND

52.      MORGAN STANLEY VALUE FUND

53.      MORGAN STANLEY GLOBAL EQUITY ALLOCATION FUND

54.      MORGAN STANLEY GLOBAL EQUITY FUND

55.      MORGAN STANLEY ASIAN GROWTH FUND

56.      MORGAN STANLEY EMERGING MARKETS FUND

57.      MORGAN STANLEY LATIN AMERICAN FUND

58.      MORGAN STANLEY INTERNATIONAL MAGNUM FUND

59.      MORGAN STANLEY JAPANESE EQUITY FUND

60.      MORGAN STANLEY MONEY MARKET FUND

61.      MORGAN STANLEY TAX FREE MONEY MARKET FUND

62.      MORGAN STANLEY GOVERNMENT OBLIGATIONS MONEY MARKET FUND

<PAGE>   13



                                AMENDMENT TWO

                                    TO THE
                AMENDED AND RESTATED LEGAL SERVICES AGREEMENT
                              DATED MAY 31, 1997


         THIS AMENDMENT TWO to the Amended and Restated Legal Services
Agreement dated May 31, 1997 by and between the parties as set forth in Schedule
1, attached hereto and incorporated by reference and VAN KAMPEN AMERICAN
CAPITAL, INC.

                             W I T N E S S E T H

         WHEREAS, Van Kampen American Capital Senior Income Trust, being a
closed-end registered investment company as that term is defined in the
Investment Company Act of 1940, as amended, wishes to become a party to the
Agreement; and

         WHEREAS, the original parties desire to add the aforementioned
additional entity as a party to the Agreement;

         NOW, THEREFORE, in consideration of the promises and mutual covenants
spelled out in the Agreement and herein, it is hereby agreed that Schedule 1 of
the Agreement be amended to add Van Kampen American Capital Senior Income Trust.


<PAGE>   14

         IN WITNESS WHEREOF, the parties have caused this Amendment Two to be
executed this 22nd day of April, 1998.




ALL OF THE PARTIES SET FORTH IN SCHEDULE 1
ATTACHED HERETO



By:      /s/ Ronald A. Nyberg
   ------------------------------
         Ronald A. Nyberg
         Executive Vice President




VAN KAMPEN AMERICAN CAPITAL, INC.



By:      /s/ Dennis J. McDonnell
   ------------------------------
         Dennis J. McDonnell
         Executive Vice President





<PAGE>   15


                                   SCHEDULE 1

1.       VAN KAMPEN AMERICAN CAPITAL U.S. GOVERNMENT TRUST, on behalf of its
         series, Van Kampen American Capital U.S. Government Fund

2.       VAN KAMPEN AMERICAN CAPITAL TAX FREE TRUST, on behalf of its series,
         Van Kampen American Capital Insured Tax Free Income Fund, Van Kampen
         American Capital Tax Free High Income Fund, Van Kampen American Capital
         California Insured Tax Free Fund, Van Kampen American Capital Municipal
         Income Fund, Van Kampen American Capital Intermediate Term Municipal
         Income Fund, Van Kampen American Capital New York Tax Free Income Fund,
         Van Kampen American Capital Florida Insured Tax Free Income Fund, Van
         Kampen American Capital California Tax Free Income Fund, Van Kampen
         American Capital Michigan Tax Free Income Fund, Van Kampen American
         Capital Missouri Tax Free Income Fund and Van Kampen American Capital
         Ohio Tax Free Income Fund

3.       VAN KAMPEN AMERICAN CAPITAL TRUST, on behalf of its series, Van Kampen
         American Capital High Yield Fund, Van Kampen American Capital
         Short-Term Global Income Fund and Van Kampen American Capital Strategic
         Income Fund

4.       VAN KAMPEN AMERICAN CAPITAL EQUITY TRUST, on behalf of its series, Van
         Kampen American Capital Utility Fund, Van Kampen American Capital Value
         Fund, Van Kampen American Capital Growth Fund, Van Kampen American
         Capital Great American Companies Fund, Van Kampen American Capital
         Prospector Fund and Van Kampen American Capital Aggressive Growth Fund

5.       VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA TAX FREE INCOME FUND

6.       VAN KAMPEN AMERICAN CAPITAL TAX FREE MONEY FUND

7.       VAN KAMPEN AMERICAN CAPITAL FOREIGN SECURITIES FUND

8.       VAN KAMPEN AMERICAN CAPITAL MUNICIPAL INCOME TRUST

9.       VAN KAMPEN AMERICAN CAPITAL CALIFORNIA MUNICIPAL TRUST

10.      VAN KAMPEN AMERICAN CAPITAL HIGH INCOME TRUST

11.      VAN KAMPEN AMERICAN CAPITAL HIGH INCOME TRUST II

12.      VAN KAMPEN AMERICAN CAPITAL PRIME RATE INCOME TRUST

13.      VAN KAMPEN AMERICAN CAPITAL SENIOR FLOATING RATE FUND

14.      VAN KAMPEN AMERICAN CAPITAL INVESTMENT GRADE MUNICIPAL TRUST

15.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL TRUST

16.      VAN KAMPEN AMERICAN CAPITAL CALIFORNIA QUALITY MUNICIPAL TRUST

17.      VAN KAMPEN AMERICAN CAPITAL FLORIDA QUALITY MUNICIPAL TRUST

18.      VAN KAMPEN AMERICAN CAPITAL NEW YORK QUALITY MUNICIPAL TRUST

19.      VAN KAMPEN AMERICAN CAPITAL OHIO QUALITY MUNICIPAL TRUST

20.      VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA QUALITY MUNICIPAL TRUST


<PAGE>   16

21.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INSURED MUNICIPALS

22.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE MUNICIPALS

23.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE CALIFORNIA
         MUNICIPALS

24.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE FLORIDA
         MUNICIPALS

25.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE NEW JERSEY
         MUNICIPALS

26.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE NEW YORK
         MUNICIPALS

27.      VAN KAMPEN AMERICAN CAPITAL TRUST FOR INVESTMENT GRADE PENNSYLVANIA
         MUNICIPALS

28.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL OPPORTUNITY TRUST

29.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE MUNICIPAL INCOME TRUST

30.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE PENNSYLVANIA MUNICIPAL INCOME
         TRUST

31.      VAN KAMPEN AMERICAN CAPITAL STRATEGIC SECTOR MUNICIPAL TRUST

32.      VAN KAMPEN AMERICAN CAPITAL VALUE MUNICIPAL INCOME TRUST

33.      VAN KAMPEN AMERICAN CAPITAL CALIFORNIA VALUE MUNICIPAL INCOME TRUST

34.      VAN KAMPEN AMERICAN CAPITAL MASSACHUSETTS VALUE MUNICIPAL INCOME TRUST

35.      VAN KAMPEN AMERICAN CAPITAL NEW JERSEY VALUE MUNICIPAL INCOME TRUST

36.      VAN KAMPEN AMERICAN CAPITAL NEW YORK VALUE MUNICIPAL INCOME TRUST

37.      VAN KAMPEN AMERICAN CAPITAL OHIO VALUE MUNICIPAL INCOME TRUST

38.      VAN KAMPEN AMERICAN CAPITAL PENNSYLVANIA VALUE MUNICIPAL INCOME TRUST

39.      VAN KAMPEN AMERICAN CAPITAL MUNICIPAL OPPORTUNITY TRUST II

40.      VAN KAMPEN AMERICAN CAPITAL FLORIDA MUNICIPAL OPPORTUNITY TRUST

41.      VAN KAMPEN AMERICAN CAPITAL ADVANTAGE MUNICIPAL INCOME TRUST II

42.      VAN KAMPEN AMERICAN CAPITAL SELECT SECTOR MUNICIPAL TRUST

43.         THE EXPLORER INSTITUTIONAL TRUST, on behalf of its sub-trusts, 
            Explorer Institutional Active Core Fund and Explorer Institutional
            Limited Duration Fund


<PAGE>   17



44.      MORGAN STANLEY FUND INC., on behalf of its series
                 Morgan Stanley Emerging Markets Debt Fund
                 Morgan Stanley Global Fixed Income Fund
                 Morgan Stanley High Yield Fund
                 Morgan Stanley Worldwide High Income Fund
                 Morgan Stanley American Value Fund
                 Morgan Stanley Aggressive Equity Fund
                 Morgan Stanley U.S. Real Estate Fund
                 Morgan Stanley Equity Growth Fund
                 Morgan Stanley Midcap Growth Fund
                 Morgan Stanley Value Fund
                 Morgan Stanley Global Equity Allocation Fund
                 Morgan Stanley Global Equity Fund
                 Morgan Stanley Asian Growth Fund
                 Morgan Stanley Emerging Markets Fund
                 Morgan Stanley Latin American Fund
                 Morgan Stanley International Magnum Fund
                 Morgan Stanley Japanese Equity Fund
                 Morgan Stanley Money Market Fund
                 Morgan Stanley Tax-Free Money Market Fund
                 Morgan Stanley Government Obligations Money Market Fund.










<PAGE>   1
 
                                                                      EXHIBIT 11
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
The Board of Trustees and Shareholders
  Explorer Institutional Trust:
 
We consent to the use of our report included in the Statement of Additional
Information which is incorporated by reference into the Prospectus and to the
reference to our Firm under the headings "Financial Highlights" in the
Prospectus and "Investment Advisory and Other Services -- Custodian and
Independent Accountants" in the Statement of Additional Information.
 
                                      /s/ KPMG Peat Marwick LLP
 
Chicago, Illinois
April 24, 1998

<PAGE>   1
                                                                   EXHIBIT (16)


                           Schedule for Computation
                          of Performance Quotations
                          -------------------------


                           EXPLORER ACTIVE CORE FUND

       TOTAL RETURN CALCULATION ONE YEAR PERIOD ENDED DECEMBER 31, 1997

                                            n
Formula                               P(1+T)     =     ERV

Net Asset Value                        $10.17          
Initial Investment                  $1,000.00    =     P
Ending Redeemable Value             $1,089.29    =     ERV
One year period ended 12/31/97              1    =     n

TOTAL RETURN FOR THE PERIOD             8.93%    =     T

         TOTAL RETURN CALCULATION INCEPTION THROUGH DECEMBER 31, 1997

                                            n
Formula                               P(1+T)     =     ERV


Net Asset Value                        $10.17  
Initial Investment                  $1,000.00    =     P
Ending Redeemable Value             $1,145.93    =     ERV
Inception through 12/31/97               1.69    =     n

TOTAL RETURN FOR THE PERIOD             8.39%    =     T

             NON-STANDARDIZED CUMULATIVE TOTAL RETURN CALCULATION
                     INCEPTION THROUGH DECEMBER 31, 1997

Formula                              ERV - P     =     T
                                     -------
                                        P


Net Asset Value                        $10.17   
Initial Investment                  $1,000.00    =     P
Ending Redeemable Value             $1,145.93    =     ERV

TOTAL RETURN FOR THE PERIOD            14.59%    =     T

<PAGE>   2
                        EXPLORER LIMITED DURATION FUND

       TOTAL RETURN CALCULATION ONE YEAR PERIOD ENDED DECEMBER 31, 1997

                                            n
Formula                               P(1+T)    =     ERV

Net Asset Value                        $10.04         
Initial Investment                  $1,000.00    =     P
Ending Redeemable Value             $1,062.91    =     ERV
One year period ended 12/31/97              1    =     n

TOTAL RETURN FOR THE PERIOD             6.29%    =     T

         TOTAL RETURN CALCULATION INCEPTION THROUGH DECEMBER 31, 1997

                                            n
Formula                               P(1+T)     =     ERV


Net Asset Value                        $10.04         
Initial Investment                  $1,000.00    =     P
Ending Redeemable Value             $1,106.91    =     ERV
Inception through 12/31/97               1.69    =     n

TOTAL RETURN FOR THE PERIOD             6.19%    =     T

             NON-STANDARDIZED CUMULATIVE TOTAL RETURN CALCULATION
                      INCEPTION THROUGH DECEMBER 31, 1997

Formula                              ERV - P     =     T
                                     -------
                                        P

Net Asset Value                        $10.04         
Initial Investment                  $1,000.00    =     P
Ending Redeemable Value             $1,106.91    =     ERV

TOTAL RETURN FOR THE PERIOD            10.69%    =     T

        

<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
   <NUMBER> 11
   <NAME> ACTIVE CORE
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                        4,646,616
<INVESTMENTS-AT-VALUE>                       4,799,853
<RECEIVABLES>                                   51,634
<ASSETS-OTHER>                                  31,865
<OTHER-ITEMS-ASSETS>                            79,676
<TOTAL-ASSETS>                               4,963,028
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       24,755
<TOTAL-LIABILITIES>                             24,755
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     4,763,330
<SHARES-COMMON-STOCK>                          485,509
<SHARES-COMMON-PRIOR>                          559,271
<ACCUMULATED-NII-CURRENT>                      (3,598)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         25,304
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       153,237
<NET-ASSETS>                                 4,938,273
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              412,409
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (25,039)
<NET-INVESTMENT-INCOME>                        387,370
<REALIZED-GAINS-CURRENT>                        97,464
<APPREC-INCREASE-CURRENT>                       71,773
<NET-CHANGE-FROM-OPS>                          556,607
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (387,399)
<DISTRIBUTIONS-OF-GAINS>                      (77,231)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        183,711
<NUMBER-OF-SHARES-REDEEMED>                  (302,158)
<SHARES-REINVESTED>                             44,685
<NET-CHANGE-IN-ASSETS>                       (702,073)
<ACCUMULATED-NII-PRIOR>                          (537)
<ACCUMULATED-GAINS-PRIOR>                        2,039
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           18,786
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                125,526
<AVERAGE-NET-ASSETS>                         6,259,666
<PER-SHARE-NAV-BEGIN>                           10.085
<PER-SHARE-NII>                                  0.626
<PER-SHARE-GAIN-APPREC>                          0.249
<PER-SHARE-DIVIDEND>                           (0.626)
<PER-SHARE-DISTRIBUTIONS>                      (0.163)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             10.171
<EXPENSE-RATIO>                                   0.40
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
  <NUMBER> 21
  <NAME> LIMITED DURATION
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                        8,073,266
<INVESTMENTS-AT-VALUE>                       8,152,270
<RECEIVABLES>                                   88,125
<ASSETS-OTHER>                                  32,533
<OTHER-ITEMS-ASSETS>                               570
<TOTAL-ASSETS>                               8,273,498
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       41,412
<TOTAL-LIABILITIES>                             41,412
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     8,154,623
<SHARES-COMMON-STOCK>                          820,195
<SHARES-COMMON-PRIOR>                          973,451
<ACCUMULATED-NII-CURRENT>                      (1,541)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        79,004
<NET-ASSETS>                                 8,232,086
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              504,464
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (32,887)
<NET-INVESTMENT-INCOME>                        471,577
<REALIZED-GAINS-CURRENT>                        25,119
<APPREC-INCREASE-CURRENT>                          872
<NET-CHANGE-FROM-OPS>                          497,568
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (471,639)
<DISTRIBUTIONS-OF-GAINS>                      (14,667)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         70,461
<NUMBER-OF-SHARES-REDEEMED>                  (272,024)
<SHARES-REINVESTED>                             48,307
<NET-CHANGE-IN-ASSETS>                     (1,520,698)
<ACCUMULATED-NII-PRIOR>                             62
<ACCUMULATED-GAINS-PRIOR>                     (11,993)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           24,651
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                139,872
<AVERAGE-NET-ASSETS>                         8,221,780
<PER-SHARE-NAV-BEGIN>                           10.019
<PER-SHARE-NII>                                  0.574
<PER-SHARE-GAIN-APPREC>                          0.036
<PER-SHARE-DIVIDEND>                           (0.574)
<PER-SHARE-DISTRIBUTIONS>                      (0.018)
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                             10.037
<EXPENSE-RATIO>                                   0.40
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission