OACIS HEALTHCARE HOLDINGS CORP
SC 13D, 1999-03-03
COMPUTER PROGRAMMING SERVICES
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<PAGE>   1

================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                               ------------------

                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                                 (RULE 13d-101)

                 INFORMATION TO BE INCLUDED IN STATEMENTS FILED
                            PURSUANT TO RULE 13d-1(a)

                         OACIS HEALTHCARE HOLDINGS CORP.
                                (Name of Issuer)

                          COMMON STOCK, $0.01 PAR VALUE
                         (Title of Class of Securities)

                               ------------------

                                 00175167107510
                                 (CUSIP Number)

                          OSCAR ACQUISITION CORPORATION
                 SCIENCE APPLICATIONS INTERNATIONAL CORPORATION
                       (Name of Persons Filing Statement)

                             WILLIAM A. ROPER, JR.
                             CHIEF FINANCIAL OFFICER
                 SCIENCE APPLICATIONS INTERNATIONAL CORPORATION
                                1241 CAVE STREET
                               LA JOLLA, CA 92037
                            TELEPHONE: (619) 535-7711

                     (Name, Address and Telephone Number of
                      Person Authorized to Receive Notices
                     and Communications on Behalf of Bidder)

                                   COPIES TO:
                                 DAVID L. CAPLAN
                              DAVIS POLK & WARDWELL
                              450 LEXINGTON AVENUE
                            NEW YORK, NEW YORK 10017
                            TELEPHONE: (212) 450-4000

                                FEBRUARY 21, 1999
             (Date of Event which Requires Filing of this Statement)

                               ------------------

        If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is filing
this statement because of Rule 13d-1(b)(3) or (4), check the following:  [ ]



================================================================================

<PAGE>   2

- -------------------------                                     ------------------
CUSIP NO. 00175167107510          SCHEDULE 13D                PAGE 2 OF 14 PAGES
- ------------------------                                      ------------------

- -------------------------------------------------------------------------------
  (1)     NAME OF REPORTING PERSON                 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                
          
          Oscar Acquisition Corporation
          Awaiting I.R.S. Identification Number
- -------------------------------------------------------------------------------
  (2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)  [ ]
                                                                        (b)  [X]
- -------------------------------------------------------------------------------
  (3)     SEC USE ONLY
- -------------------------------------------------------------------------------
  (4)     SOURCE OF FUNDS*
          Not applicable
- -------------------------------------------------------------------------------
  (5)     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
          ITEMS 2(d) or 2(e)                                                [ ]
- -------------------------------------------------------------------------------
  (6)     CITIZENSHIP OR PLACE OF ORGANIZATION                      

          Delaware  
- -------------------------------------------------------------------------------
                       (7)     SOLE VOTING POWER                    
  NUMBER OF                    0        
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (8)     SHARED VOTING POWER                  
  OWNED BY                     6,267,216
    EACH               --------------------------------------------------------
  REPORTING            (9)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   0         
                       --------------------------------------------------------
                       (10)    SHARED DISPOSITIVE POWER             
                                6,267,216
- -------------------------------------------------------------------------------
 (11)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

          6,267,216
- -------------------------------------------------------------------------------
 (12)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
          SHARES*                                                            [ ]
- -------------------------------------------------------------------------------
 (13)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)           

          57.4%
- -------------------------------------------------------------------------------
 (14)     TYPE OF REPORTING PERSON*
         
          CO
- -------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

SEC 1746 (9-88) 2 of 7

<PAGE>   3

- -------------------------                                     ------------------
CUSIP NO. 00175167107510          SCHEDULE 13D                PAGE 3 OF 14 PAGES
- ------------------------                                      ------------------

- -------------------------------------------------------------------------------
  (1)     NAME OF REPORTING PERSON                 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS                
          
          Science Applications International Corporation
          95-3630868                       
- -------------------------------------------------------------------------------
  (2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)  [ ]
                                                                        (b)  [X]
- -------------------------------------------------------------------------------
  (3)     SEC USE ONLY
- -------------------------------------------------------------------------------
  (4)     SOURCE OF FUNDS*
          Not applicable
- -------------------------------------------------------------------------------
  (5)     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
          ITEMS 2(d) or 2(e)                                                [ ]
- -------------------------------------------------------------------------------
  (6)     CITIZENSHIP OR PLACE OF ORGANIZATION                      

          Delaware  
- -------------------------------------------------------------------------------
                       (7)     SOLE VOTING POWER                    
  NUMBER OF                    0        
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (8)     SHARED VOTING POWER                  
  OWNED BY                     6,267,216
    EACH               --------------------------------------------------------
  REPORTING            (9)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   0         
                       --------------------------------------------------------
                       (10)    SHARED DISPOSITIVE POWER             
                                6,267,216
- -------------------------------------------------------------------------------
 (11)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

          6,267,216
- -------------------------------------------------------------------------------
 (12)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) INCLUDES CERTAIN
          SHARES*                                                            [ ]
- -------------------------------------------------------------------------------
 (13)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)           

          57.4%
- -------------------------------------------------------------------------------
 (14)     TYPE OF REPORTING PERSON*
         
          HC, CO
- -------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

SEC 1746 (9-88) 2 of 7

<PAGE>   4



    ITEM 1. SECURITY AND ISSUER.

        The class of equity securities to which this statement relates is the
Common Stock, $0.01 par value per share (the "Shares"), of Oacis Healthcare
Holdings Corp., a Delaware corporation (the "Issuer"). The principal executive
offices of the Issuer are located at 1101 Fifth Avenue, Suite 200, San Rafael,
CA 94901.

    ITEM 2. IDENTITY AND BACKGROUND.

        The names of the persons filing this statement are Oscar Acquisition
Corporation, a Delaware corporation ("Purchaser"), and Science Applications
International Corporation, a Delaware corporation ("Parent").

        Purchaser is a wholly-owned subsidiary of Parent. The address of the
principal business and the principal office of Purchaser is 10260 Campus Point
Drive, San Diego, CA 92121. The name, business address, present principal
occupation or employment, and citizenship of each director and executive officer
of Purchaser is set forth on Schedule A. Purchaser to date has engaged in no
activities other than those incident to formation, the execution and delivery of
the Merger Agreement and each Stockholder Agreement and the commencement of the
Offer (each as defined below).

        The address of the principal business and the principal office of Parent
is 10260 Campus Point Drive, San Diego, CA 92121. The name, business address,
present principal occupation or employment, and citizenship of each director and
executive officer of Parent is set forth on Schedule B. Parent is principally
engaged in providing diversified professional and technical services and in
designing, developing and manufacturing high-technology products. A large part
of Parent's technical services and products are sold to departments and agencies
of the U.S. Government. The balance of Parent's sales are made to foreign, state
and local governments, commercial customers and others.

        During the last five years, neither Purchaser nor Parent (together, the
"Reporting Persons") nor, to the best of their knowledge, any of the persons
listed on Schedule A or Schedule B attached hereto, has been convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors) or
has been a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction and as a result of such proceeding was or is subject to a
judgment, decree or final order enjoining future violations of, or prohibiting
or mandating activities subject to, federal or state securities laws or finding
any violation with respect to such laws.

    ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

        Beneficial ownership of the Shares was acquired through execution of
stockholder agreements dated as of February 21, 1999 (the "Stockholder
Agreements") between Purchaser and certain stockholders of the Issuer (the
"Stockholders"). None of the Reporting Persons has expended any funds in
connection with the execution of the Stockholder Agreements. See Item 6.

    ITEM 4. PURPOSE OF TRANSACTION.

        See Item 6.

    ITEM 5. INTEREST IN SECURITIES OF THE ISSUER.

        (a) For the purpose of Rule 13d-3 promulgated under the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), each of the Reporting
Persons has shared voting power and shared dispositive power with respect to
(and therefore beneficially owns) 6,267,216 Shares, including warrants to
purchase 146,606 Shares, representing approximately 57.4% of the outstanding
Shares (assuming conversion of all outstanding warrants into 293,211 Shares) of
the Issuer as of February 19, 1999.

        Except as set forth in this Item 5(a), none of the Reporting Persons
nor, to the best of their knowledge, any persons named in Schedule A or Schedule
B hereto owns beneficially any Shares.


                                       4


<PAGE>   5



        (b) The Reporting Persons do not have sole power to vote or to dispose
of any Shares. The Reporting Persons have shared power to vote or to direct the
vote of 6,267,216 Shares, including warrants to purchase 146,606 Shares
currently held by certain Stockholders. The Reporting Persons have shared power
to dispose or to direct the disposition of 6,267,216 Shares, including warrants
to purchase 146,606 Shares currently held by certain Stockholders.

        (c) No transactions in the Shares have been effected since January 2,
1999 by any Reporting Person or, to the best of the knowledge of the Reporting
Persons, any of the persons named in Schedule A and Schedule B.

        (d) Inapplicable.

        (e) Inapplicable.

    ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
            RESPECT TO SECURITIES OF THE ISSUER.

        On February 21, 1999, the Issuer, Parent and Purchaser entered into an
Agreement and Plan of Merger (the "Merger Agreement") providing for, subject to
the terms and conditions set forth in the Merger Agreement, Purchaser to
commence an offer to purchase all of the outstanding Shares (which, together
with the related letter of transmittal, constitutes the "Offer") and, as soon as
practicable after the consummation of the Offer, for Purchaser to merge with and
into the Issuer (the "Merger"), with the Issuer to be the surviving corporation
in the Merger. Pursuant to the Merger, each outstanding Share (other than Shares
held by Parent or any of its subsidiary of Parent and Shares held by
stockholders properly exercising appraisal rights under the laws of the State of
Delaware) will be converted into a right to receive $4.45 in cash, without
interest. A copy of the Merger Agreement is attached hereto as Exhibit 1 and
incorporated herein by reference.

        As an inducement and a condition to Purchaser and Parent entering into
the Merger Agreement, the Stockholders (owners of 6,120,610 Shares and warrants
to purchase 146,606 Shares) and Purchaser entered into the Stockholder
Agreements.

        The Stockholders party to the Stockholder Agreements are as follows:

                (i) Information Partners Capital Fund, L.P.,

                (ii) BCIP Associates,

                (iii) BCIP Trust Associates, L.P.,

                (iv) Sutter Hill Ventures,

                (v) InterWest Partners V, L.P.,

                (vi) IMS Health Incorporated,

                (vii) Sequoia Capital Growth Fund,

                (viii) Sequoia Technology Partners III,

                (ix) WPG Enterprise Fund II, L.L.C., and

                (x) Weiss, Peck & Greer Venture Associates III, L.L.C.

        Information Partners Capital Fund, L.P., BCIP Associates and BCIP Trust
Associates, L.P. currently hold warrants to purchase 135,757, 4,398 and 6,451
Shares, respectively. Each such Stockholder has executed a notice irrevocably




                                       5

<PAGE>   6


converting its warrant in full immediately prior to the Merger; however, such
notice does not prevent the relevant Stockholder from converting the warrants at
an earlier time.

        Pursuant to the Stockholder Agreements, each Stockholder irrevocably and
unconditionally agrees to validly tender (and not withdraw), pursuant to and in
accordance with the terms of the Offer, all of the shares of capital stock of
the Issuer that such Stockholder beneficially owns as of the date of the
Stockholder Agreement as well as any additional shares of capital stock of the
Issuer that such Stockholder may beneficially own, whether acquired by purchase,
exercise of options or otherwise, at any time after the date of the Stockholder
Agreement and prior to the expiration of the Offer, as the expiration of the
Offer may be extended from time to time (the "Stockholder Shares"). Within five
business days after the commencement of the Offer, such Stockholder shall
deliver to the Depositary (i) a letter of transmittal with respect to the
Stockholder Shares complying with the terms of the Offer, (ii) certificates
representing all of the Stockholder Shares and (iii) all other documents or
instruments required to be delivered pursuant to the terms of the Offer.

        Pursuant to the Stockholder Agreements, each Stockholder irrevocably and
unconditionally agrees to vote or cause to be voted all Stockholder Shares at
the time any vote of the stockholders of the Issuer is taken on such matters (i)
in favor of the approval and adoption of the Merger Agreement and in favor of
the transactions contemplated thereby and (ii) against any (A) acquisition
proposal other than the Merger, (B) reorganization, recapitalization,
liquidation or winding up of the Issuer or any other extraordinary transaction
involving the Issuer, (C) corporate action the consummation of which would
frustrate the purposes, or prevent or delay the consummation, of the
transactions contemplated by the Merger Agreement or (D) other matter relating
to, or in connection with, any of the matters referred to in clause (A), (B) or
(C) above.

        Pursuant to the Stockholder Agreements, each Stockholder irrevocably and
unconditionally grants a proxy appointing Purchaser as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated above as Purchaser or its
proxy or substitute shall, in Purchaser's sole discretion, deem proper with
respect to the Stockholder Shares.

        According to the Stockholder Agreements, from the date thereof until the
termination thereof, each Stockholder and the officers, directors, employees or
other agents of such Stockholder will not, directly or indirectly, (i) take any
action to solicit, initiate or encourage any acquisition proposal other than the
Merger or (ii) engage in negotiations with, or disclose any nonpublic
information relating to the Issuer or any subsidiary or afford access to the
properties, books or records of the Issuer or any subsidiary to any person.
Stockholder will promptly notify Purchaser after (A) such Stockholder has
received any acquisition proposal, (B) such Stockholder has been advised that
any person is considering making an acquisition proposal, or (C) such
Stockholder has received any request for nonpublic information relating to the
Issuer or any subsidiary, or for access to the properties, books or records of
the Issuer or any subsidiary, by any person. Each Stockholder will keep
Purchaser fully informed of the status and details of any such acquisition
proposal or request. Each Stockholder shall, and shall cause its directors,
officers, employees, financial advisors and other agents or representatives to,
cease immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any persons conducted heretofore with respect to any
acquisition proposal.

        The Stockholder Agreements contain customary representations and
warranties of the parties thereto.

        Except pursuant to the terms of the Stockholder Agreements, each
Stockholder agrees that, without the prior written consent of Purchaser, such
Stockholder will not, directly or indirectly, (i) grant any proxies or enter
into any voting trust or other agreement or arrangement with respect to the
voting of any Stockholder Shares or (ii) sell, assign, transfer, encumber
mortgage or otherwise dispose of, or enter into any contract, option or other
arrangement or understanding with respect to the direct or indirect sale,
assignment, transfer, encumbrance, mortgage or other disposition of, any
Stockholder Shares during the term of the Stockholder Agreements.




                                       6


<PAGE>   7



        Each Stockholder agrees not to exercise any rights (including, without
limitation, under Section 262 of the General Corporation Law of the State of
Delaware) to demand appraisal of any Stockholder Shares which may arise with
respect to the Merger.

        Any provision of the Stockholder Agreements may be amended or waived if,
but only if, such amendment or waiver is in writing and is signed, in the case
of an amendment, by each party or in the case of a waiver, by the party against
whom the waiver is to be effective. Each Stockholder Agreement will terminate on
the earlier to occur of the consummation of the Merger or 18 months after the
date of the Stockholder Agreement.

        Copies of the Stockholder Agreements are attached hereto as Exhibits 2
through 11 and incorporated herein by reference.

        THE SUMMARY CONTAINED IN THIS SCHEDULE 13D OF CERTAIN PROVISIONS OF THE
STOCKHOLDER AGREEMENTS AND THE MERGER AGREEMENT IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO THE MERGER AGREEMENT AND THE STOCKHOLDER AGREEMENTS ATTACHED AS
EXHIBITS 1 AND 2 THROUGH 11 HERETO, RESPECTIVELY.

        Except for the Merger Agreement and the Stockholder Agreements as
described above, to the best knowledge of Purchaser, there are no contracts,
arrangements, understandings or relationships (legal or otherwise) between the
persons enumerated in Item 2, and any other person, with respect to any
securities of the Issuer, including, but not limited to, transfer or voting of
any of the securities, finder's fees, joint ventures, loan or option
arrangements, puts or calls, guarantees of profits, division of profits or loss,
or the giving or withholding of proxies.

        Except as described in this Schedule 13D, based on their current
knowledge of the Issuer, the Reporting Persons have no present plans or
proposals that would relate to or result in any extraordinary corporate
transaction (such as a merger, reorganization, liquidation or relocation of any
operations) involving the Issuer or any of its subsidiaries, any sale or
transfer of a material amount of assets of the Issuer or any of its
subsidiaries, any change in the Issuer's capitalization or dividend policy, any
changes in the Issuer's charter, bylaws or instruments corresponding thereto or
other actions which may impede the acquisition of control of the Issuer by any
person or any other material change in the Issuer's corporate structure or
business.

        The Merger Agreement provides that, effective upon acceptance for
payment pursuant to the Offer of a number of Shares that would represent at
least a majority of the total number of outstanding shares on a fully diluted
basis, Parent shall be entitled to designate the number of directors, rounded up
to the next whole number, on the Issuer's Board of Directors that equals the
product of (i) the total number of directors on the Issuer's Board of Directors
multiplied by (ii) the percentage that the number of Shares beneficially owned
by Parent (including Shares accepted for payment) bears to the total number of
Shares outstanding. On February 20, 1999, John Kingery, Fred Goad, Dennis Sisco
and Jim McCord resigned from the Issuer's Board of Directors effective upon the
purchase by Purchaser of the Shares tendered in the Offer. In addition, the
Stockholder Agreements provide that each Stockholder party to such agreement
shall cause all directors affiliated with such stockholder to resign from the
Issuer's Board of Directors upon consummation of the Offer. Such resignations
are sufficient for Parent to designate up to eight out of nine directors of the
Issuer following the consummation of the offer.

        If Parent exercises its right to designate directors, Parent currently
intends to designate one or more of the following persons to serve as directors
of the Issuer: J. Robert Beyster, David A. Cox, John E. Glancy, William A.
Roper, Jr., Tracy Trent, Peter N. Pavlics, Douglas E. Scott, J. Dennis Heipt,
Kevin A. Werner.

        Depending upon the number of Shares purchased pursuant to the Offer, the
Shares may no longer meet the standards for continued inclusion in the Nasdaq
National Market. If, as a result of the purchase of Shares pursuant to the
Offer, the Shares no longer meet the criteria for continuing inclusion in the
Nasdaq National Market, the market for the Shares could be adversely affected.
According to Nasdaq's published listing requirements, in order for the Shares to
be eligible for continued inclusion in the Nasdaq National Market, there must
continue to be, among other things, a public float of 750,000 shares, held by at
least 400 stockholders (round lot holders), with a market value of 




                                       7

<PAGE>   8


at least $5 million. If the Shares were no longer eligible for inclusion in the
Nasdaq National Market, they may nevertheless continue to be included in the
Nasdaq SmallCap Market unless, among other things, the public float was less
than 500,000 shares, or there were fewer than 300 stockholders (round lot
holders) in total, or the market value of public float was less than $1 million.
If the Shares are no longer eligible for inclusion in the Nasdaq National Market
or the Nasdaq SmallCap Market, the Shares might still be quoted on the OTC
Bulletin Board.

        The Shares are currently registered under the Exchange Act. Such
registration may be terminated upon application of the Issuer to the Securities
and Exchange Commission (the "Commission") if the Shares are neither listed on a
national securities exchange nor held by 300 or more holders of record.
Termination of the registration of the Shares under the Exchange Act would
substantially reduce the information required to be furnished by the Issuer to
holders of Shares and to the Commission and would make certain of the provisions
of the Exchange Act, such as the short-swing profit recovery provisions of
Section 16(b), the requirement of furnishing a proxy statement pursuant to
Section 14 in connection with a stockholder's meeting and the related
requirement of an annual report to stockholders and the requirements of Rule
13e-3 under the Exchange Act with respect to "going private" transactions, no
longer applicable to the Shares. Furthermore, "affiliates" of the Issuer and
persons holding "restricted securities" of the Issuer may be deprived of the
ability to dispose of such securities pursuant to Rule 144 promulgated under the
Securities Act of 1933. If registration of the Shares under the Exchange Act
were terminated, the Shares would no longer be "margin securities" or eligible
for listing or Nasdaq reporting. Purchaser intends to seek to cause the Issuer
to terminate registration of the Shares under the Exchange Act as soon after
consummation of the Offer as the requirements for termination of registration of
the Shares are met.

    ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.

            Exhibit  1: Agreement and Plan of Merger dated as of February 21,
                        1999, among Oacis Healthcare Holdings Corp., Science
                        Applications International Corporation and Oscar
                        Acquisition Corporation

            Exhibit  2: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and Information
                        Partners Capital Fund, L.P.

            Exhibit  3: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and BCIP
                        Associates

            Exhibit  4: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and BCIP Trust
                        Associates, L.P.

            Exhibit  5: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and Sutter Hill
                        Ventures

            Exhibit  6: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and InterWest
                        Partners V, L.P.

            Exhibit  7: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and IMS Health
                        Incorporated

            Exhibit  8: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and Sequoia
                        Capital Growth Fund

            Exhibit  9: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and Sequoia
                        Technology Partners III

            Exhibit 10: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and WPG Enterprise
                        Fund II, L.L.C.



                                       8


<PAGE>   9



            Exhibit 11: Stockholder Agreement dated as of February 21, 1999
                        between Oscar Acquisition Corporation and Weiss, Peck &
                        Greer Venture Associates III, L.L.C.

            Exhibit 12: Joint Filing Agreement dated as of March 3, 1999 between
                        Oscar Acquisition Corporation and Science Application
                        International Corporation




                                       9

<PAGE>   10



                                   SIGNATURES

            After reasonable inquiry and to the best knowledge and belief of the
undersigned, the undersigned certifies that the information set forth in this
statement is true, complete and correct.


Date: March 3, 1999

                                  Oscar Acquisition Corporation


                                  By:   /s/ Kevin A. Werner
                                     -------------------------------------------
                                     Name:  Kevin A. Werner
                                     Title: Secretary


                                  Science Applications International Corporation


                                  By:   /s/ Kevin A. Werner
                                     -------------------------------------------
                                     Name:  Kevin A. Werner
                                     Title: Assistant Secretary & 
                                            Associate General Counsel



                                       10
<PAGE>   11



                                                                      SCHEDULE A

        DIRECTORS AND EXECUTIVE OFFICERS OF OSCAR ACQUISITION CORPORATION

The name, business address, title, present principal occupation or employment of
each of the directors and executive officers of Purchaser are set forth below.
If no business address is given the director's or officer's business address is
10260 Campus Point Drive, San Diego, CA 92121. All of the persons listed below
are citizens of the United States of America.


<TABLE>
<CAPTION>
                                             PRESENT PRINCIPAL OCCUPATION INCLUDING NAME AND
          NAME AND BUSINESS ADDRESS                       ADDRESS* OF EMPLOYER
- --------------------------------------------------------------------------------------------
Directors

<S>                                           <C>
J. R. Beyster...............................  Director of Purchaser since the company was
                                              founded. Mr. Beyster is also the Chairman of
                                              the Board, Chief Executive Officer, President
                                              and a Director of Parent.

D. A. Cox...................................  President and Director of Purchaser since the
                                              company was founded. Mr. Cox is also the
                                              Executive Vice President of Parent since
                                              January 1998.

W. A. Roper, Jr.............................  Chief Financial Officer and Director of
                                              Purchaser since the company was founded. Mr.
                                              Roper is also Senior Vice President and Chief
                                              Financial Officer of Parent since 1990.
</TABLE>



<TABLE>
<CAPTION>
                                             PRESENT PRINCIPAL OCCUPATION INCLUDING NAME AND
     NAME AND BUSINESS ADDRESS                          ADDRESS** OF EMPLOYER
- --------------------------------------------------------------------------------------------
Executive Officers
(Who Are Not Directors)

<S>                     <C>
T. Trent...................................  Vice President of Purchaser since the company
                                             was founded. Since January 1999, Mr. Trent has
                                             been Group Senior Vice President of Parent.

K. A. Werner...............................  Secretary of Purchaser since the company was
                                             founded. Since May 1997, Mr. Werner has been
                                             Associate General Counsel of Parent.
</TABLE>





- -------------------

 * Same address as director's or officer's business address.

** Same address as director's or officer's business address.



                                       11

<PAGE>   12



                                                                      SCHEDULE B

                       DIRECTORS AND EXECUTIVE OFFICERS OF
                 SCIENCE APPLICATIONS INTERNATIONAL CORPORATION



The name, business address, title, present principal occupation or employment of
each of the directors and executive officers of Parent are set forth below. If
no business address is given the director's or officer's business address is
10260 Campus Point Drive, San Diego, CA 92121. All of the persons listed below
are citizens of the United States of America.

<TABLE>
<CAPTION>
                                             PRESENT PRINCIPAL OCCUPATION INCLUDING NAME AND
     NAME AND BUSINESS ADDRESS                          ADDRESS* OF EMPLOYER
- --------------------------------------------------------------------------------------------
Directors
<S>                                           <C>
D. P. Andrews...............................  Corporate Executive Vice President since
                                              January 1998 and a Director since October 1996.

J. R. Beyster...............................  Chairman of the Board, Chief Executive Officer
                                              and a Director of Parent since the company was
                                              founded and President of Parent since 1998.

V. N. Cook..................................  Director since 1990. Mr. Cook is also a member
                                              of the Board of Directors of KFX,  Inc. and the
                                              Chairman of Visions International, Inc., an
                                              industry consulting firm.

W. H. Demisch...............................  Director since 1990. Mr. Demisch has been a
                                              Managing Director of BT Alex. Brown since 1993.

D. W. Dorman................................  Director since 1998. President and Chief
                                              Executive Officer of PointCast Incorporated
                                              ("PointCast") since November 1997 and Chairman
                                              of the Board of PointCast since February 1998.

W. A. Downing...............................  Director since 1996. General Downing, USA
                                              (Ret.) joined Parent as a part-time employee in
                                              March 1996.

J. E. Glancy................................  Corporate Executive Vice President since
                                              January  1994 and a Director of Parent since
                                              July 1994.

B. R. Inman.................................  Director since 1982.  Admiral Inman,  USN (Ret.)
                                              joined Parent in 1990 as a  part-time  employee
                                              and, in that capacity, advises Parent on a wide
                                              variety of strategic planning issues.

A. K. Jones.................................  Director since 1998. Dr. Jones has been a
                                              professor at the University of Virginia since
                                              1989.

H. M. J. Kraemer............................  Director since 1997. Mr. Kraemer has served as
                                              the President of Baxter International, Inc., a
                                              health-care products, systems and services
                                              company, since April 1997.
</TABLE>



- -------------------

 * Same address as director's or officer's business address.




                                       12

<PAGE>   13



<TABLE>
<CAPTION>
<S>                                           <C>
C. B. Malone................................  Director since 1993. Ms. Malone has served as
                                              the President of Financial & Management
                                              Consulting, Inc., a consulting company, since
                                              1982.

J. W. McRary................................  Director since 1972. Dr. McRary is the
                                              Chairman of the Board, President and Chief
                                              Executive Officer of Microelectronics and
                                              Computer Technology Corporation, a corporation
                                              involved in research and development of
                                              advanced computer architecture, software
                                              technology, component packaging and
                                              computer-aided design and manufacturing.

S. D. Rockwood..............................  Executive Vice President of Parent since April
                                              1997 and Director of Parent since 1996.

R. C. Smith.................................  Chief Executive Officer and a Director of Bell
                                              Communications Research, Inc., a  wholly-owned
                                              subsidiary  of the Company, since January 1998
                                              and a Director of Parent since April 1998.

E. A. Straker...............................  Executive Vice President of Parent since 1994
                                              and a Director since 1992.

M. E. Trout.................................  Director since 1995. Dr. Trout is also a member
                                              of the Board of Directors of Baxter
                                              International, West Co. and the UCSD Foundation
                                              and the Chairman of the Board of Cytyc, Inc.

J. P. Walkush...............................  Sector Vice President, Director since 1996.
                                              Mr. Walkush was elected as a Sector Vice
                                              President in 1994.

J. H. Warner, Jr............................  Corporate Executive Vice President of Parent
                                              since 1996 and Director since 1988.

J. A. Welch.................................  Director since 1984. Dr. Welch joined Parent
                                              in July 1990 and is currently a part-time
                                              employee involved in a number of scientific
                                              endeavors and strategic planning issues. Dr.
                                              Welch also serves as President of Jasper Welch
                                              Associates, a consulting firm which he founded
                                              in 1983.

J. B. Wiesler...............................  Director since 1989.

A. T. Young.................................  Director since 1995. Mr. Young is also on the
                                              Board of Directors of the Dial Corporation, the
                                              B.F. Goodrich Company and Potomac Electric
                                              Power Company.
</TABLE>



                                       13


<PAGE>   14


<TABLE>
<CAPTION>
                                              PRESENT PRINCIPAL OCCUPATION INCLUDING NAME AND
         NAME AND BUSINESS ADDRESS                         ADDRESS* OF EMPLOYER
- -----------------------------------------------------------------------------------------------
Executive Officers
(Who Are Not Directors)

<S>                                          <C>
D. W. Baldwin..............................  Senior Vice President and Treasurer of Parent
                                             since January 1997.

D. A. Cox..................................  Executive Vice President of Parent since January
                                             1998.

J. D. Heipt................................  Senior Vice President for Administration and
                                             Secretary of Parent since 1984.

P. N. Pavlics..............................  Senior Vice President of Parent since January
                                             1997 and Controller of Parent since 1993.

W. A. Roper, Jr............................  Senior Vice  President and Chief Financial
                                             Officer of Parent since 1990.

R. A. Rosenberg............................  Executive Vice President of Parent since 1992.

D. E. Scott................................  Senior Vice President since January 1997 and
                                             General Counsel of Parent since 1992.
</TABLE>



- --------

* Same address as director's or officer's business address.




                                       14
<PAGE>   15
                                 EXHIBIT INDEX

          EXHIBIT
          NUMBER         DESCRIPTION
          -------        -----------

          Exhibit  1     Agreement and Plan of Merger dated as of February 21,
                         1999, among Oacis Healthcare Holdings Corp., Science
                         Applications International Corporation and Oscar
                         Acquisition Corporation

          Exhibit  2     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and Information
                         Partners Capital Fund, L.P.

          Exhibit  3     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and BCIP
                         Associates

          Exhibit  4     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and BCIP Trust
                         Associates, L.P.

          Exhibit  5     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and Sutter Hill
                         Ventures

          Exhibit  6     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and InterWest
                         Partners V, L.P.

          Exhibit  7     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and IMS Health
                         Incorporated

          Exhibit  8     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and Sequoia
                         Capital Growth Fund

          Exhibit  9     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and Sequoia
                         Technology Partners III

          Exhibit 10     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and WPG
                         Enterprise Fund II, L.L.C.

          Exhibit 11     Stockholder Agreement dated as of February 21, 1999
                         between Oscar Acquisition Corporation and Weiss, Peck &
                         Greer Venture Associates III, L.L.C.

          Exhibit 12     Joint Filing Agreement dated as of March 3, 1999
                         between Oscar Acquisition Corporation and Science
                         Application International Corporation

<PAGE>   1
                                                                       EXHIBIT 1

                                                                  EXECUTION COPY




                          AGREEMENT AND PLAN OF MERGER

                                   dated as of

                                February 21, 1999

                                      among

                        OACIS HEALTHCARE HOLDINGS CORP.,


                 SCIENCE APPLICATIONS INTERNATIONAL CORPORATION

                                       and

                          OSCAR ACQUISITION CORPORATION


<PAGE>   2

                                   TABLE OF CONTENTS
                                   -----------------

<TABLE>
                                                                            PAGE
                                                                            ----
<S>            <C>                                                          <C>
                                    ARTICLE 1
                                    THE OFFER

SECTION 1.01.  The Offer......................................................1
SECTION 1.02.  Company Action.................................................2
SECTION 1.03.  Directors......................................................3

                                    ARTICLE 2
                                   THE MERGER

SECTION 2.01.  The Merger.....................................................4
SECTION 2.02.  Conversion of Shares...........................................4
SECTION 2.03.  Surrender and Payment..........................................4
SECTION 2.04.  Dissenting Shares..............................................6
SECTION 2.05.  Stock Options..................................................6
SECTION 2.06.  Employee Stock Purchase Plan...................................6

                                    ARTICLE 3
                            THE SURVIVING CORPORATION

SECTION 3.01.  Certificate of Incorporation...................................7
SECTION 3.02.  Bylaws.........................................................7
SECTION 3.03.  Directors and Officers.........................................7

                                    ARTICLE 4
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

SECTION 4.01.  Corporate Existence and Power..................................8
SECTION 4.02.  Corporate Authorization........................................8
SECTION 4.03.  Governmental Authorization.....................................8
SECTION 4.04.  Non-contravention..............................................9
SECTION 4.05.  Capitalization.................................................9
SECTION 4.06.  Subsidiaries..................................................10
SECTION 4.07.  SEC Filings...................................................10
SECTION 4.08.  Financial Statements..........................................11
SECTION 4.09.  Disclosure Documents..........................................12
SECTION 4.10.  Absence of Certain Changes....................................12
SECTION 4.11.  Material Contracts............................................14
SECTION 4.12.  No Undisclosed Material Liabilities...........................16
</TABLE>


                                       i
<PAGE>   3

<TABLE>
                                                                            PAGE
                                                                            ----
<S>            <C>                                                          <C>

SECTION 4.13.  Litigation....................................................16
SECTION 4.14.  Taxes.........................................................16
SECTION 4.15.  ERISA.........................................................18
SECTION 4.16.  Compliance with Laws..........................................20
SECTION 4.17.  Finders' Fees.................................................20
SECTION 4.18.  Patents and Other Proprietary Rights..........................20
SECTION 4.19.  Real Property.................................................21
SECTION 4.20.  Environmental Matters.........................................21
SECTION 4.21.  Year 2000 Compliance..........................................22

                                    ARTICLE 5
                     REPRESENTATIONS AND WARRANTIES OF BUYER

SECTION 5.01.  Corporate Existence and Power.................................23
SECTION 5.02.  Corporate Authorization.......................................23
SECTION 5.03.  Governmental Authorization....................................23
SECTION 5.04.  Non-contravention.............................................23
SECTION 5.05.  Disclosure Documents..........................................24

                                    ARTICLE 6
                            COVENANTS OF THE COMPANY

SECTION 6.01.  Conduct of the Company........................................24
SECTION 6.02.  Tax Certification.............................................25
SECTION 6.03.  Stockholder Meeting; Proxy Material...........................25
SECTION 6.04.  Access to Information.........................................26
SECTION 6.05.  Other Offers..................................................26
SECTION 6.06.  Notices of Certain Events.....................................27

                                    ARTICLE 7
                               COVENANTS OF BUYER

SECTION 7.01.  Obligations of Merger Subsidiary..............................27
SECTION 7.02.  Voting of Shares..............................................27
SECTION 7.03.  Director and Officer Liability................................27

                                    ARTICLE 8
                       COVENANTS OF BUYER AND THE COMPANY

SECTION 8.01.  Reasonable Best Efforts.......................................28
SECTION 8.02.  Certain Filings...............................................28
</TABLE>


                                       ii
<PAGE>   4

<TABLE>
                                                                            PAGE
                                                                            ----
<S>            <C>                                                          <C>
SECTION 8.03.  Public Announcements..........................................28
SECTION 8.04.  Further Assurances............................................29

                                    ARTICLE 9
                            CONDITIONS OF THE MERGER

SECTION 9.01.  Conditions to the Obligations of Each Party...................29

                                   ARTICLE 10
                                   TERMINATION

SECTION 10.01.  Termination..................................................29
SECTION 10.02.  Effect of Termination........................................31

                                   ARTICLE 11
                                  MISCELLANEOUS

SECTION 11.01.  Notices......................................................31
SECTION 11.02.  Survival of Representations and Warranties...................32
SECTION 11.03.  Amendments; No Waivers.......................................32
SECTION 11.04.  Fees and Expenses............................................32
SECTION 11.05.  Successors and Assigns.......................................33
SECTION 11.06.  Governing Law................................................33
SECTION 11.07.  Counterparts; Effectiveness; Third Party.....................33
SECTION 11.08.  Entire Agreement.............................................33
SECTION 11.09.  Definitions..................................................33
</TABLE>


                                       iii
<PAGE>   5

                          AGREEMENT AND PLAN OF MERGER



        AGREEMENT AND PLAN OF MERGER dated as of February 20, 1999 among Oacis
Healthcare Holdings Corp., a Delaware corporation (the "COMPANY"), Science
Applications International Corporation, a Delaware corporation ("BUYER"), and
Oscar Acquisition Corporation, a Delaware corporation and a wholly-owned
subsidiary of Buyer ("MERGER SUBSIDIARY").

        The parties hereto agree as follows:



                                    ARTICLE 1
                                    THE OFFER

        SECTION 1.01. The Offer. (a) Provided that nothing shall have occurred
that would result in a failure to satisfy any of the conditions set forth in
Annex I hereto, Merger Subsidiary shall, as promptly as practicable after the
date hereof, but in no event later than five business days following the public
announcement of the terms of this Agreement, commence an offer (the "OFFER") to
purchase all of the outstanding shares (the "SHARES") of common stock, $0.01 par
value per share, of the Company (the "COMMON STOCK") at a price of $4.45 per
Share, net to the seller in cash. The Offer shall be subject to the condition
that a number of Shares which, together with the Shares then owned by Buyer,
represents at least a majority of the Shares outstanding on a fully diluted
basis shall be validly tendered in accordance with the terms of the Offer prior
to the expiration date of the Offer and not withdrawn (the "MINIMUM CONDITION")
and to the other conditions set forth in Annex I hereto. Merger Subsidiary
expressly reserves the right to waive the Minimum Condition or any of the other
conditions to the Offer and to make any change in the terms or conditions of the
Offer; provided that no change may be made which changes the form of
consideration to be paid or decreases the price per Share or the number of
Shares sought in the Offer or which imposes conditions to the Offer in addition
to those set forth in Annex I. Notwithstanding the foregoing, Merger Subsidiary
may, without the consent of the Company, (i) extend the Offer, if at any
scheduled or extended expiration date of the Offer any of the conditions set
forth in Annex I hereto or the Minimum Condition shall not be satisfied or
waived, (ii) extend the Offer for any period required by any rule, regulation,
interpretation or position of the Securities and Exchange Commission (the "SEC")
or the staff thereof applicable to the Offer or any period required by
applicable law and (iii) extend the Offer on one or more occasions, if on such
expiration date there shall not have been validly tendered in accordance with
the term of the Offer and not withdrawn at least a majority of the outstanding
Shares.


<PAGE>   6

        (b) As soon as practicable on the date of commencement of the Offer,
Merger Subsidiary shall file with the SEC a Tender Offer Statement on Schedule
14D-1 with respect to the Offer which will contain the offer to purchase and
form of the related letter of transmittal (together with any supplements or
amendments thereto, collectively the "OFFER DOCUMENTS"). Buyer and the Company
each agrees promptly to correct any information provided by it for use in the
Offer Documents if and to the extent that it shall have become false or
misleading in any material respect. Merger Subsidiary agrees to take all steps
necessary to cause the Offer Documents as so corrected to be filed with the SEC
and to be disseminated to holders of Shares, in each case as and to the extent
required by applicable federal securities laws. The Company and its counsel
shall be given an opportunity to review and comment on the Schedule 14D-1 prior
to its being filed with the SEC.

        SECTION 1.02. Company Action. (a) The Company hereby consents to the
Offer and represents that its Board of Directors, at a meeting duly called and
held has (i) unanimously determined that this Agreement and the transactions
contemplated hereby, including the Offer and the Merger, are fair to and in the
best interest of the Company's stockholders, (ii) unanimously approved this
Agreement and the transactions contemplated hereby, including the Offer and the
Merger, which approval satisfies in full any applicable requirements of the
General Corporation Law of the State of Delaware ("DELAWARE LAW"), and (iii)
unanimously resolved, except as may be required, in response to an unsolicited
bona fide written Acquisition Proposal, in order to comply with the fiduciary
duties of the Board of Directors under applicable law as advised in writing by
Cooley Godward LLP ("COMPANY COUNSEL"), to recommend acceptance of the Offer and
approval and adoption of this Agreement and the Merger by its stockholders. The
Company further represents that Covington Associates has delivered to the
Company's Board of Directors its written opinion that the consideration to be
paid in the Offer and the Merger is fair to the holders of Shares from a
financial point of view. The Company has been advised that all of its directors
and executive officers intend either to tender their Shares pursuant to the
Offer or to vote in favor of the Merger. The Company will promptly furnish Buyer
with a list of its stockholders, mailing labels and any available listing or
computer file containing the names and addresses of all record holders of Shares
and lists of securities positions of Shares held in stock depositories, in each
case true and correct as of the most recent practicable date, and will provide
to Buyer such additional information (including, without limitation, updated
lists of stockholders, mailing labels and lists of securities positions) and
such other assistance as Buyer may reasonably request in connection with the
Offer.

        (b) As soon as practicable on the date of commencement of the Offer, the
Company will file with the SEC a Solicitation/Recommendation Statement on
Schedule 14D-9 (the "SCHEDULE 14D-9") which shall reflect the recommendations of
the Company's Board of Directors referred to above. The Company and Buyer each
agree promptly to correct any information provided by it for use in the Schedule
14D-9 if and


                                       2
<PAGE>   7

to the extent that it shall have become false or misleading in any material
respect. The Company agrees to take all steps necessary to cause the Schedule
14D-9 as so corrected to be filed with the SEC and to be disseminated to holders
of Shares, in each case as and to the extent required by applicable federal
securities laws. Buyer and its counsel shall be given an opportunity to review
and comment on the Schedule 14D-9 prior to its being filed with the SEC.

        SECTION 1.03. Directors. (a) Effective upon the acceptance for payment
pursuant to the Offer of a number of Shares that satisfies the Minimum
Condition, Buyer shall be entitled to designate the number of directors, rounded
up to the next whole number, on the Company's Board of Directors that equals the
product of (i) the total number of directors on the Company's Board of Directors
(giving effect to the election of any additional directors pursuant to this
Section) multiplied by (ii) the percentage that the number of Shares
beneficially owned by Buyer (including Shares accepted for payment) bears to the
total number of Shares outstanding; and the Company shall take all action
necessary to cause Buyer's designees to be elected or appointed to the Company's
Board of Directors, including, without limitation, increasing the number of
directors and seeking and accepting resignations of incumbent directors. At such
times, the Company will use its best efforts to cause individuals designated by
Buyer to constitute the same percentage as such individuals represent on the
Company's Board of Directors of (A) each committee of the Board and (B) each
board of directors (and committee thereof) of each Subsidiary. Notwithstanding
the foregoing, the Company shall use its best efforts to cause at least two
members of the Company's Board of Directors as of the date hereof who are not
employees of the Company to remain members of the Board of Directors until the
Effective Time.

        (b) The Company's obligations to appoint designees to the Board of
Directors shall be subject to Section 14(f) of the Exchange Act and Rule 14f-1
promulgated thereunder. The Company shall promptly take all actions required
pursuant to Section 14(f) and Rule 14f-1 in order to fulfill its obligations
under this Section 1.03 and shall include in the Schedule 14D-9 such information
with respect to the Company and its officers and directors as is required under
Section 14(f) and Rule 14f-1 to fulfill its obligations under this Section 1.03.
Buyer will supply to the Company in writing and be solely responsible for any
information with respect to itself and its nominees, officers, directors and
Affiliates required by Section 14(f) and Rule 14f-1. For purposes of this
Agreement, "AFFILIATE" of any Person means any other Person controlling,
controlled by or under common control with such Person, where "CONTROL" means
the possession, directly or indirectly, of the power to direct the management
and policies of a Person whether through the ownership of voting securities, by
contract or otherwise.


                                       3
<PAGE>   8

                                    ARTICLE 2
                                   THE MERGER

        SECTION 2.01. The Merger. (a) At the Effective Time, Merger Subsidiary
shall be merged (the "MERGER") with and into the Company in accordance with
Delaware Law, whereupon the separate existence of Merger Subsidiary shall cease,
and the Company shall be the surviving corporation (the "SURVIVING
CORPORATION").

        (b) As soon as practicable after satisfaction or, to the extent
permitted hereunder, waiver of all conditions to the Merger, the Company and
Merger Subsidiary will file a certificate of merger ("CERTIFICATE OF MERGER")
with the Secretary of State of the State of Delaware and make all other filings
or recordings required by Delaware Law in connection with the Merger. The Merger
shall become effective at such time as the Certificate of Merger is duly filed
with the Secretary of State of the State of Delaware or at such later time as is
specified in the Certificate of Merger (the "EFFECTIVE TIME").

        (c) From and after the Effective Time, the Surviving Corporation shall
possess all the rights, privileges, powers and franchises and be subject to all
of the restrictions, disabilities and duties of the Company and Merger
Subsidiary, all as provided under Delaware Law.

        SECTION 2.02. Conversion of Shares. At the Effective Time:

        (a) each Share held by the Company as treasury stock or owned by Buyer
or any subsidiary of Buyer immediately prior to the Effective Time shall be
canceled, and no payment shall be made with respect thereto;

        (b) each share of common stock of Merger Subsidiary outstanding
immediately prior to the Effective Time shall be converted into and become one
share of common stock of the Surviving Corporation with the same rights, powers
and privileges as the shares so converted and shall constitute the only
outstanding shares of capital stock of the Surviving Corporation; and

        (c) each Share outstanding immediately prior to the Effective Time
shall, except as otherwise provided in Section 2.02(a) or as provided in Section
2.04 with respect to Shares as to which appraisal rights have been exercised, be
converted into the right to receive $4.45 in cash, without interest (the "MERGER
CONSIDERATION").

        SECTION 2.03. Surrender and Payment. (a) Prior to the Effective Time,
Buyer shall appoint an agent (the "EXCHANGE AGENT") for the purpose of
exchanging certificates representing Shares for the Merger Consideration. Buyer
will make available to the Exchange Agent, in such amounts as may be needed from
time to time, the Merger


                                       4
<PAGE>   9

Consideration to be paid in respect of the Shares. Promptly after the Effective
Time, Buyer will send, or will cause the Exchange Agent to send, to each holder
of Shares at the Effective Time a letter of transmittal for use in such exchange
(which shall specify that the delivery shall be effected, and risk of loss and
title shall pass, only upon proper delivery of the certificates representing
Shares to the Exchange Agent).

        (b) Each holder of Shares that have been converted into a right to
receive the Merger Consideration, upon surrender to the Exchange Agent of a
certificate or certificates representing such Shares, together with a properly
completed letter of transmittal covering such Shares, will be entitled to
receive the Merger Consideration payable in respect of such Shares. From and
after the Effective Time, all Shares which have been so converted shall no
longer be outstanding and shall automatically be canceled and retired, and each
such certificate shall, after the Effective Time, represent for all purposes,
only the right to receive such Merger Consideration.

        (c) If any portion of the Merger Consideration is to be paid to a Person
other than the registered holder of the Shares represented by the certificate or
certificates surrendered in exchange therefor, it shall be a condition to such
payment that the certificate or certificates so surrendered shall be properly
endorsed or otherwise be in proper form for transfer and that the Person
requesting such payment shall pay to the Exchange Agent any transfer or other
taxes required as a result of such payment to a Person other than the registered
holder of such Shares or establish to the satisfaction of the Exchange Agent
that such tax has been paid or is not payable. For purposes of this Agreement,
"PERSON" means an individual, a corporation, a limited liability company, a
partnership, an association, a trust or any other entity or organization,
including a government or political subdivision or any agency or instrumentality
thereof.

        (d) After the Effective Time, there shall be no further registration of
transfers of Shares. If, after the Effective Time, certificates representing
Shares are presented to the Surviving Corporation, they shall be canceled and
exchanged for the consideration provided for, and in accordance with the
procedures set forth, in this Article 2.

        (e) Any portion of the Merger Consideration made available to the
Exchange Agent pursuant to Section 2.03(a) that remains unclaimed by the holders
of Shares six months after the Effective Time shall be returned to Buyer, upon
demand, and any such holder who has not exchanged Shares for the Merger
Consideration in accordance with this Section 2.03 prior to that time shall
thereafter look only to Buyer for payment of the Merger Consideration in respect
of Shares. Notwithstanding the foregoing, Buyer shall not be liable to any
holder of Shares for any amount paid to a public official pursuant to applicable
abandoned property laws. Any amounts remaining unclaimed by holders of Shares
two years after the Effective Time (or such earlier date immediately prior to
such time as such amounts would otherwise escheat to or become property of any


                                       5
<PAGE>   10

governmental entity) shall, to the extent permitted by applicable law, become
the property of Buyer free and clear of any claims or interest of any Person
previously entitled thereto.

        (f) Any portion of the Merger Consideration made available to the
Exchange Agent pursuant to Section 2.03(a) to pay for Shares for which appraisal
rights have been perfected shall be returned to Buyer, upon demand.

        SECTION 2.04. Dissenting Shares. Notwithstanding Section 2.02, Shares
outstanding immediately prior to the Effective Time and held by a holder who has
not voted in favor of the Merger or consented thereto in writing and who has
demanded appraisal for such Shares in accordance with Delaware Law shall not be
converted into a right to receive the Merger Consideration, unless such holder
fails to perfect or withdraws or otherwise loses his right to appraisal. If
after the Effective Time such holder fails to perfect or withdraws or loses his
right to appraisal, such Shares shall be treated as if they had been converted
as of the Effective Time into a right to receive the Merger Consideration. The
Company shall give Buyer prompt notice of any demands received by the Company
for the appraisal of Shares, and Buyer shall have the right to participate in
all negotiations and proceedings with respect to such demands. The Company shall
not, except with the prior written consent of Buyer, make any payment with
respect to, or settle or offer to settle, any such demands.

        SECTION 2.05. Stock Options. (a) At the Effective Time, each option to
purchase shares of Common Stock outstanding under any employee stock option or
compensation plan or arrangement of the Company (other than the Company Stock
Purchase Plan), whether or not such option is then yet vested or exercisable,
shall be canceled, and Buyer shall pay the option holder in cash at the
Effective Time for each such option an amount determined by multiplying (i) the
excess, if any, of the Merger Consideration per share over the applicable
exercise price per share of such option by (ii) the number of shares to which
such option relates.

        (b) Prior to the Effective Time, the Company shall take all actions
(including, if appropriate, amending the terms of the Company's stock option or
compensation plans or arrangements) that are necessary to give effect to the
transactions contemplated by Section 2.05(a).

        SECTION 2.06. Employee Stock Purchase Plan. (a) After the date hereof,
no new purchase period shall commence under the Company Stock Purchase Plan. As
of the Effective Time, the Company Stock Purchase Plan shall be terminated.
Buyer shall pay each participant in any current purchase period under such Plan
in cash at the Effective Time, in cancellation of all rights under such Plan, an
amount determined by multiplying (i) the Merger Consideration per share by (ii)
the number of shares such participant could have purchased under the Company
Stock Purchase Plan based on his or her account balance under such Plan
immediately prior to the Effective Time (treating, for such


                                       6
<PAGE>   11

purpose, the purchase price per share of Common Stock as equal to 85% of the
fair market value of a share of Common Stock on the enrollment date with respect
to such purchase period) (such payment to be net of applicable withholding
taxes).

        (b) Prior to the Effective Time, the Company shall take all actions
(including, if appropriate, amending the terms of the Company Stock Purchase
Plan) that are necessary to give effect to the transactions contemplated by
Section 2.06(a).

        (c) Employees of the Company will be eligible to participate in Buyer's
1998 Employee Stock Purchase Plan after the Closing Date; provided that such
employees meet the eligibility requirements of the Buyer's 1998 Employee Stock
Purchase Plan, taking into account each such employee's service with the
Company.

                                    ARTICLE 3
                            THE SURVIVING CORPORATION

        SECTION 3.01. Certificate of Incorporation. The certificate of
incorporation of Merger Subsidiary in effect at the Effective Time shall be the
certificate of incorporation of the Surviving Corporation until amended in
accordance with applicable law, except that the name of the Surviving
Corporation shall be changed to "Oacis Healthcare Holdings Corp."

        SECTION 3.02. Bylaws. The bylaws of Merger Subsidiary in effect at the
Effective Time shall be the bylaws of the Surviving Corporation until amended in
accordance with applicable law.

        SECTION 3.03. Directors and Officers. From and after the Effective Time,
until successors are duly elected or appointed and qualified in accordance with
applicable law, (a) the directors of Merger Subsidiary at the Effective Time
shall be the directors of the Surviving Corporation and (b) the officers of the
Company at the Effective Time shall be the officers of the Surviving
Corporation.


                                       7
<PAGE>   12

                                    ARTICLE 4
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

        The Company represents and warrants to Buyer and Merger Subsidiary that:

        SECTION 4.01. Corporate Existence and Power. The Company is a
corporation duly incorporated, validly existing and in good standing under the
laws of the State of Delaware and has all corporate powers and all material
governmental licenses, authorizations, consents and approvals required to carry
on its business as now conducted. The Company is duly qualified to do business
as a foreign corporation and is in good standing in each jurisdiction where the
character of the property owned or leased by it or the nature of its activities
makes such qualification necessary, except for those jurisdictions where the
failure to be so qualified could not, individually or in the aggregate,
reasonably be expected to have a material adverse effect on the condition
(financial or otherwise), business, assets, results of operations or prospects
of the Company and the Subsidiaries taken as a whole (a "MATERIAL ADVERSE
EFFECT"). The Company has heretofore delivered to Buyer true and complete copies
of the Company's certificate of incorporation (the "CERTIFICATE OF
INCORPORATION") and bylaws as currently in effect.

        SECTION 4.02. Corporate Authorization. The Company has all requisite
corporate power and corporate authority to enter into this Agreement and,
subject to the adoption of this Agreement by the requisite vote of the holders
of the Shares, to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by the Company of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of the Company, subject in the case of the
consummation of the Merger to the approval of this Agreement by the stockholders
of the Company. This Agreement has been duly executed and delivered by the
Company and constitutes a valid and binding agreement of the Company,
enforceable against it in accordance with its terms, except as such
enforceability may be limited by bankruptcy, insolvency, reorganization,
moratorium and other similar laws relating to or affecting creditors generally
and by general equity principles (regardless of whether such enforceability is
considered in a proceeding in equity or at law).

        SECTION 4.03. Governmental Authorization. The execution, delivery and
performance by the Company of this Agreement and the consummation of the Merger
by the Company require no action by or in respect of, or filing with, any
governmental body, agency, official or authority other than (a) the filing of
the Certificate of Merger in accordance with Delaware Law; (b) compliance with
any applicable requirements of the Hart-Scott-Rodino Antitrust Improvements Act
of 1976 (the "HSR ACT");


                                       8
<PAGE>   13

and (c) compliance with any applicable requirements of the Securities Exchange
Act of 1934 and the rules and regulations promulgated thereunder (the "EXCHANGE
ACT").

        SECTION 4.04. Non-contravention. Except as set forth on Schedule 4.04,
the execution, delivery and performance by the Company of this Agreement and the
consummation by the Company of the transactions contemplated hereby do not and
will not (a) contravene or conflict with the Certificate of Incorporation or
bylaws of the Company, (b) assuming compliance with the matters referred to in
Section 4.03, contravene or conflict with or constitute a violation of any
provision of any law, regulation, judgment, injunction, order or decree binding
upon or applicable to the Company or any Subsidiary, (c) constitute a default
under or give rise to a right of termination, cancellation or acceleration of
any right or obligation of the Company or any Subsidiary or to a loss of any
benefit to which the Company or any Subsidiary is entitled under any provision
of any agreement, contract or other instrument binding upon the Company or any
Subsidiary or any license, franchise, permit or other similar authorization held
by the Company or any Subsidiary, or (d) result in the creation or imposition of
any Lien on any asset of the Company or any Subsidiary except, in the case of
clauses (b), (c) and (d), for such matters as would not, individually or in the
aggregate, have a Material Adverse Effect. For purposes of this Agreement,
"LIEN" means, with respect to any asset, any mortgage, lien, pledge, charge,
security interest or encumbrance of any kind in respect of such asset.

        SECTION 4.05. Capitalization. The authorized capital stock of the
Company consists of 30,000,000 shares of Common Stock, $0.01 par value per
share, and 5,000,000 shares of preferred stock, $0.01 par value per share
("PREFERRED STOCK"). As of February 19, 1999, there were outstanding (i)
10,619,646 shares of Common Stock, (ii) stock options to purchase an aggregate
of 2,348,762 shares of Common Stock, of which options to purchase 2,265,519
shares of Common Stock have exercise prices less than $4.45 (at a weighted
average exercise price of $2.42 per share) and of which options to purchase
83,243 shares of Common Stock have exercise prices equal to or greater than
$4.45 (at a weighted average exercise price of $8.49 per share) and (iii)
warrants to purchase 293,211 shares of Common Stock at a weighted average
exercise price of $0.44 per share (of which all will be exercised prior to the
Effective Time). There are and there will be no shares of Preferred Stock
outstanding. All outstanding shares of capital stock of the Company have been
duly authorized and validly issued and are fully paid and nonassessable. All
shares of Common Stock issuable upon exercise of outstanding stock options have
been duly authorized and, when issued, will have been validly issued and will be
fully paid and nonassessable. Except as set forth in this Section 4.05 and
except for changes since the date hereof resulting from the exercise of stock
options and purchase rights outstanding on such date, there are outstanding (a)
no shares of capital stock or other voting securities of the Company, (b) no
securities of the Company convertible into or exchangeable for shares of capital
stock or voting securities of the Company and (c) no options or other rights to
acquire from the Company, and no

                                       9
<PAGE>   14

obligation of the Company to issue, any capital stock, voting securities or
securities convertible into or exchangeable for capital stock or voting
securities of the Company (the items in clauses (a), (b) and (c) being referred
to collectively as the "COMPANY SECURITIES"). There are no outstanding
obligations of the Company or any Subsidiary to repurchase, redeem or otherwise
acquire any Company Securities.

        SECTION 4.06. Subsidiaries. (a) Each Subsidiary is a corporation duly
incorporated, validly existing and, if applicable, in good standing under the
laws of its jurisdiction of incorporation, has all corporate powers and all
material governmental licenses, authorizations, consents and approvals required
to carry on its business as now conducted and is duly qualified to do business
as a foreign corporation and is in good standing in each jurisdiction where the
character of the property owned or leased by it or the nature of its activities
makes such qualification necessary, except for those jurisdictions where failure
to be so qualified would not, individually or in the aggregate, have a Material
Adverse Effect. For purposes of this Agreement, "SUBSIDIARY" means any
corporation or other entity of which securities or other ownership interests
having ordinary voting power to elect a majority of the board of directors or
other persons performing similar functions are directly or indirectly owned by
the Company. All Subsidiaries and their respective jurisdictions of
incorporation are identified in the Company's annual report on Form 10-KSB for
the fiscal year ended December 31, 1997 (the "COMPANY 10-K").

        (b) All of the outstanding capital stock of, or other voting securities
or ownership interests in, each Subsidiary, is owned by the Company, directly or
indirectly, free and clear of any Lien and free of any other limitation or
restriction (including any restriction on the right to vote, sell or otherwise
dispose of such stock or other securities or ownership interests). There are no
outstanding (i) securities of the Company or any Subsidiary convertible into or
exchangeable for shares of capital stock or other voting securities or ownership
interests in any Subsidiary and (ii) options or other rights to acquire from the
Company or any Subsidiary, or other obligation of the Company or any Subsidiary
to issue, any capital stock, voting securities or other ownership interests in,
or any securities convertible into or exchangeable for any capital stock, voting
securities or ownership interests in, any Subsidiary (the items in clauses (i)
and (ii) being referred to collectively as the "SUBSIDIARY SECURITIES"). There
are no outstanding obligations of the Company or any Subsidiary to repurchase,
redeem or otherwise acquire any outstanding Subsidiary Securities.

        SECTION 4.07. SEC Filings. (a) The Company has delivered to Buyer (i)
the Company's annual reports on Form 10-KSB for its fiscal years ended December
31, 1995, 1996 and 1997, (ii) its quarterly reports on Form 10-Q for its fiscal
quarters ended March 31, June 30 and September 30, 1998 (the "COMPANY 10-Qs"),
(iii) its proxy or information statements relating to meetings of, or actions
taken without a meeting by, the stockholders of the Company held since December
31, 1997 and (iv) all of its other

                                       10
<PAGE>   15

reports, statements, schedules and registration statements filed with the
Securities and Exchange Commission (the "SEC") since December 31, 1997.

        (b) As of its filing date, each such report or statement filed pursuant
to the Exchange Act did not contain any untrue statement of a material fact or
omit to state any material fact necessary in order to make the statements made
therein, in the light of the circumstances under which they were made, not
misleading.

        (c) Each such registration statement, as amended or supplemented, if
applicable, filed pursuant to the Securities Act of 1933 as of the date such
statement or amendment became effective did not contain any untrue statement of
a material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading.

        SECTION 4.08. Financial Statements. (a) The Balance Sheet and the
Related Financial Statements and the audited consolidated financial statements
and unaudited consolidated interim financial statements of the Company included
in its annual reports on Form 10-KSB referred to in Section 4.07 and the Company
10-Qs fairly present, in conformity with generally accepted accounting
principles applied on a consistent basis (except as may be indicated in the
notes thereto), the consolidated financial position of the Company and its
consolidated subsidiaries as of the dates thereof and their consolidated results
of operations and cash flows for the periods then ended (subject to normal
year-end adjustments in the case of any unaudited interim financial statements).
For purposes of this Agreement, "BALANCE SHEET" means the audited consolidated
balance sheet of the Company and its consolidated Subsidiaries as of December
31, 1998, which has been delivered to Buyer prior to the date hereof by the
Company, "BALANCE SHEET DATE" means December 31, 1998 and "RELATED FINANCIAL
STATEMENTS" means the related audited consolidated statements of income and cash
flows of the Company and its consolidated Subsidiaries for the year ended
December 31, 1998, which have been delivered to Buyer prior to the date hereof
by the Company.

        (b) The Balance Sheet and the Related Financial Statements and the
audited consolidated financial statements and unaudited consolidated interim
financial statements of the Company included in its annual reports on Form
10-KSB referred to in Section 4.07 and the Company 10-Qs comply with all
financial accounting standards issued by Financial Accounting Standards Board
including without limitation, (i) Statement of Financial Accounting Standards
No. 128, "Earnings per Share," and Staff Accounting Bulletin No. 98, (ii)
Statement of Financial Accounting Standards No. 130, "Reporting Comprehensive
Income," (iii) Statement of Financial Accounting Standards No. 131, "Disclosures
about Segments of an Enterprise and Related Information" and (iv) Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Instruments
and Hedging Activities."


                                       11
<PAGE>   16

        (c) Since January 1, 1998, revenue recognition by the Company on the
Balance Sheet and the Related Financial Statements and the audited consolidated
financial statements and unaudited consolidated interim financial statements of
the Company included in its annual reports on Form 10-KSB referred to in Section
4.07 and the Company 10-Qs have complied in all respects with the American
Institute of Certified Public Accountants Statement of Position Nos. 97-2 and
98-4.

        (d) Reserves for warranty claims under contracts and "estimates to
complete" on the Balance Sheet and the Related Financial Statements and the
audited consolidated financial statements and unaudited consolidated interim
financial statements of the Company included in its annual reports on Form
10-KSB referred to in Section 4.07 and the Company 10-Qs reflect all facts and
circumstances which were known, or should have been known after a diligent
inquiry, to the management of the Company at the time the estimate was made.

        SECTION 4.09. Disclosure Documents. (a) Each document required to be
filed by the Company with the SEC in connection with the transactions
contemplated by this Agreement (the "COMPANY DISCLOSURE DOCUMENTS"), including,
without limitation, the Schedule 14D-9, the proxy or information statement of
the Company (the "COMPANY PROXY STATEMENT"), if any, to be filed with the SEC in
connection with the Merger, and any amendments or supplements thereto will, when
filed, comply as to form in all material respects with the applicable
requirements of the Exchange Act.

        (b) At the time the Company Proxy Statement or any amendment or
supplement thereto is first mailed to stockholders of the Company and at the
time such stockholders vote on adoption of this Agreement, the Company Proxy
Statement, as supplemented or amended, if applicable, will not contain any
untrue statement of a material fact or omit to state any material fact necessary
in order to make the statements made therein, in the light of the circumstances
under which they were made, not misleading. At the time of the filing of any
Company Disclosure Document other than the Company Proxy Statement, at the time
of any distribution thereof and at the time of consummation of the Offer, such
Company Disclosure Document will not contain any untrue statement of a material
fact or omit to state a material fact necessary in order to make the statements
made therein, in the light of the circumstances under which they were made, not
misleading. The representations and warranties contained in this Section 4.09(b)
will not apply to statements or omissions included in the Company Disclosure
Documents based upon information furnished to the Company in writing by Buyer
specifically for use therein.

        (c) The information with respect to the Company or any Subsidiary that
the Company furnishes to Buyer in writing specifically for use in the Offer
Documents will not, at the time of the filing thereof, at the time of any
distribution thereof and at the time of the consummation of the Offer, contain
any untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary in order to make the

                                       12
<PAGE>   17

statements made therein, in the light of the circumstances under which they were
made, not misleading.

        SECTION 4.10. Absence of Certain Changes. Except as disclosed in
Schedule 4.10, since December 31, 1998, the Company and Subsidiaries have
conducted their business in the ordinary course consistent with past practice
and there has not been:

        (a) any event, occurrence or development or state of circumstances or
facts which, individually or in the aggregate, has had or could reasonably be
expected to have a Material Adverse Effect;

        (b) any declaration, setting aside or payment of any dividend or other
distribution with respect to any shares of capital stock of the Company, or any
repurchase, redemption or other acquisition by the Company or any Subsidiary of
any outstanding shares of capital stock or other securities of, or other
ownership interests in, the Company or any Subsidiary;

        (c) any acquisition by the Company or any Subsidiary of a material
amount of assets, including without limitation stock or other equity interest,
from any Person or any sale, lease, license or other disposition of assets or
property of the Company or any Subsidiary other than in the ordinary course of
business consistent with past practices;

        (d) any amendment of any material term of any outstanding security of
the Company or any Subsidiary;

        (e) any incurrence, assumption or guarantee by the Company or any
Subsidiary of any indebtedness for borrowed money other than in the ordinary
course of business and in amounts and on terms consistent with past practices;

        (f) any creation or assumption by the Company or any Subsidiary of any
Lien on any material asset other than in the ordinary course of business
consistent with past practices;

        (g) any making by the Company or any Subsidiary of any loan, advance or
capital contributions to or investment in any Person other than loans, advances
or capital contributions to or investments in wholly-owned Subsidiaries made in
the ordinary course of business consistent with past practices;

        (h) any condemnation, seizure, damage, destruction or other casualty
loss (whether or not covered by insurance) affecting the business or assets of
the Company or any Subsidiary which, individually or in the aggregate, has had
or could reasonably be expected to have a Material Adverse Effect;


                                       13
<PAGE>   18

        (i) any transaction or commitment made, or any contract or agreement
entered into, amended or terminated by the Company or any Subsidiary relating to
its assets or business (including the acquisition or disposition of any assets)
or any relinquishment by the Company or any Subsidiary of any contract or other
right, in either case, material to the Company and the Subsidiaries taken as a
whole, other than transactions and commitments in the ordinary course of
business consistent with past practice and those contemplated by this Agreement;

        (j) any change in any method of accounting or accounting practice by the
Company or any Subsidiary, except for any such change required by reason of a
concurrent change in generally accepted accounting principles;

        (k) any tax election, other than those consistent with past practice,
not required by law or any settlement or compromise of any tax liability in
either case that is material to the Company and the Subsidiaries;

        (l) any (i) grant of any severance or termination pay to any director,
officer or employee of the Company or any Subsidiary, (ii) increase in benefits
payable under any existing severance or termination pay policies or employment
agreements, (iii) entering into of any employment, deferred compensation or
other similar agreement (or any amendment to any such existing agreement) with
any director, officer or employee of the Company or any Subsidiary, (iv)
entering into of any employment, deferred compensation or other similar
agreement with a Person providing for compensation, bonus or other benefits in
excess of $100,000 during any 12 month period, (v) any other increase in
compensation, bonus or other benefits payable to any director, officer or
employee of the Company or any Subsidiary, other than, in the case of clause
(v), any such increases payable to employees other than directors or officers in
the ordinary course of business consistent with past practice; or

        (m) any labor dispute, other than routine individual grievances, or any
activity or proceeding by a labor union or representative thereof to organize
any employees of the Company or any Subsidiary, which employees were not subject
to a collective bargaining agreement at the Balance Sheet Date, or any lockouts,
strikes, slowdowns, work stoppages or threats thereof by or with respect to such
employees.

        SECTION 4.11. Material Contracts. (a) Except as disclosed in Schedule
4.11, neither the Company nor any Subsidiary is a party to or bound by and none
of the assets of the Company or any Subsidiary is covered by or subject to any
of the following (whether oral or written):

                (i) any lease (whether of real or personal property) providing
        for annual rentals of $50,000 or more;


                                       14
<PAGE>   19

                (ii) any agreement for the purchase of materials, software,
        supplies, goods, services, equipment or other assets providing for
        either (A) annual payments by the Company and the Subsidiaries of
        $50,000 or more or (B) aggregate payments by the Company and the
        Subsidiaries of $50,000 or more;

                (iii) any sales, distribution or other similar agreement
        providing for the sale by the Company or any Subsidiary of materials,
        supplies, goods, services, equipment or other assets that provides for
        either (A) annual payments to the Company and the Subsidiaries of
        $50,000 or more or (B) aggregate payments to the Company and the
        Subsidiaries of $50,000 or more;

                (iv) any partnership, joint venture or other similar agreement
        or arrangement;

                (v) any agreement relating to the acquisition or disposition of
        any business (whether by merger, sale of stock, sale of assets or
        otherwise);

                (vi) any agreement relating to indebtedness for borrowed money
        or the deferred purchase price of property (in either case, whether
        incurred, assumed, guaranteed or secured by any asset), except any such
        agreement with an aggregate outstanding principal amount not exceeding
        $50,000 and which may be prepaid on not more than 30 days notice without
        the payment of any penalty;

                (vii) any option, license, franchise or similar agreement;

                (viii) any agency, dealer, sales representative, marketing or
        other similar agreement;

                (ix) any agreement that limits the freedom of the Company or any
        Subsidiary to compete in any line of business or with any Person or in
        any area or which would so limit the freedom of the Company or any
        Subsidiary after the Closing Date;

                (x) any agreement with (A) any Person directly or indirectly
        owning, controlling or holding with power to vote, 5% or more of the
        outstanding voting securities of the Company or any of its Affiliates,
        (B) any Person 5% or more of whose outstanding voting securities are
        directly or indirectly owned, controlled or held with power to vote by
        the Company or any of its Affiliates;

                (xi) any agreement with any director or officer of the Company
        or any Subsidiary or with any "associate" or any member of the
        "immediate family" (as such terms are respectively defined in Rules
        12b-2 and 16a-1 of the Exchange Act) of any such director or officer; or


                                       15
<PAGE>   20

                (xii) any other agreement, commitment, arrangement or plan not
        made in the ordinary course of business that is material to the Company
        and the Subsidiaries, taken as a whole.

        (b) Except as set forth in section 4.11(b) of Schedule 4.11, each
agreement, contract, plan, lease, arrangement or commitment disclosed in any
Schedule to this Agreement or required to be disclosed pursuant to this Section
4.11 is a valid and binding agreement of the Company or a Subsidiary, as the
case may be, and is in full force and effect, and none of the Company, any
Subsidiary or, to the knowledge of the Company, any other party thereto is in
default or breach in any material respect under the terms of any such agreement,
contract, plan, lease, arrangement or commitment, and, to the knowledge of the
Company, no event or circumstance has occurred that, with notice or lapse of
time or both, would constitute any event of default thereunder. True and
complete copies of each such agreement, contract, plan, lease, arrangement or
commitment have been delivered to Buyer.

        SECTION 4.12. No Undisclosed Material Liabilities. Except as set forth
on Schedule 4.12, there are no liabilities or obligations of the Company or any
Subsidiary of any kind whatsoever, including any liability for Taxes, whether
accrued, contingent, absolute, determined, determinable or otherwise, and there
is no existing condition, situation or set of circumstances which could
reasonably be expected to result in such a liability or obligation, other than:

        (a) liabilities or obligations disclosed or provided for in the Balance
Sheet;

        (b) liabilities or obligations incurred in the ordinary course of
business consistent with past practice since the Balance Sheet Date, which in
the aggregate are not material to the Company and the Subsidiaries, taken as a
whole; and

        (c) liabilities or obligations under this Agreement.

        SECTION 4.13. Litigation. Except as set forth in the Company 10-K or on
Schedule 4.13, there is no action, suit, investigation or proceeding pending, or
to the knowledge of the Company threatened, against the Company or any
Subsidiary or any of their respective properties or any of their respective
officers or directors in their capacity as officers or directors of the Company
before any court or arbitrator or before or by any governmental body, agency or
official which, if determined or resolved adversely to the Company or any
Subsidiary in accordance with the plaintiff's demands, could, individually or in
the aggregate, reasonably be expected to have a Material Adverse Effect or which
in any manner challenges or seeks to prevent, enjoin, alter or materially delay
the Offer or the Merger or any of the other transactions contemplated hereby.


                                       16
<PAGE>   21

        SECTION 4.14. Taxes. (a) Except as set forth on Schedule 4.14:

                (i) the Company and each of its Subsidiaries, and each
        affiliated group (within the meaning of Section 1504 of the Code) of
        which Company or any Subsidiary is or has been a member, have timely
        filed (or have had timely filed on their behalf) or will file or cause
        to be timely filed all Tax Returns required by applicable law to be
        filed prior to or as of the Effective Time, and all such Tax Returns
        are, or will be at the time of filing, true and complete in all
        respects;

                (ii) the Company and each of its Subsidiaries have paid (or have
        had paid on their behalf), or have established (or have had established
        on their behalf and for their sole benefit and recourse) in accordance
        with generally accepted accounting principles an adequate accrual for
        the payment of, all Taxes due with respect to any period or portion
        thereof ending prior to or as of the Effective Time and with respect to
        completed or settled examinations or concluded litigation;

                (iii) the federal income Tax Returns of the Company and its
        Subsidiaries have been examined and settled with the Internal Revenue
        Service (the "IRS") (or the applicable statutes of limitation for the
        assessment of federal income Taxes for such periods have expired) for
        all years through 1994;

                (iv) as of the date of this Agreement the Company and its
        Subsidiaries have not executed an extension or waiver of any statute of
        limitations on the assessment or collection of any Tax due, which
        extension or waiver is still in effect;

                (v) there are no Liens or encumbrances for Taxes on any of the
        assets of Company or any of its Subsidiaries;

                (vi) the Company and its Subsidiaries have complied with all
        applicable laws, rules and regulations relating to the payment and
        withholding of Taxes;

                (vii) neither the Company nor any of its Subsidiaries is a party
        to any action or proceeding, nor, to the knowledge of the Company, is
        any such action or proceeding threatened, by any Taxing Authority for
        the assessment or collection of any Taxes, and no deficiency notices or
        reports have been received by the Company or any of its Subsidiaries in
        respect of any deficiencies for any Tax;

                (viii) the Company and Subsidiaries do not own or lease any
        interest in real property in the State of California or in any other
        jurisdiction in which a Tax is imposed on the transfer of a controlling
        interest in an entity that owns or leases an interest in real property;
        and


                                       17
<PAGE>   22

                (ix) neither the Company's shares of capital stock nor the
        shares of capital stock of any Subsidiary of the Company are "United
        States real property interests" within the meaning of Section 897 of the
        Code.

        (b) For purposes of this Section 4.14, the following terms shall have
the meaning set forth below:

        "TAXES" shall mean (A) any and all taxes, charges, fees, levies or other
assessments, including income, gross receipts, excise, real or personal
property, sales, social security, retirement, unemployment, occupation, use,
goods and services, service use, license, value added, capital, net worth,
payroll, profits, withholding, franchise, transfer and recording taxes, fees and
charges, and any other taxes, assessment or similar charges imposed by the IRS
or any taxing authority (whether domestic or foreign including any state,
county, local or foreign government or any subdivision or taxing agency thereof
(including a United States possession)) (a "TAXING AUTHORITY"), whether computed
on a separate, consolidated, unitary, combined or any other basis; and such term
shall include any interest whether paid or received, fines, penalties or
additional amounts attributable to, or imposed upon, or with respect to, any
such taxes, charges, fees, levies or other assessments, and (B) any liability
for the payment of any amounts of the type described in (A) as a result of being
a member of an affiliated, consolidated, combined or unitary group, or being a
party to any agreement or arrangement whereby the liability of such amounts is
determined or taken into account with reference to the liability of any other
Person.

        "TAX RETURN" shall mean any report, return, document, declaration or
other information or filing required to be supplied to any Taxing Authority with
respect to Taxes, including information returns, any documents with respect to
or accompanying payments of estimated Taxes, or with respect to or accompanying
requests for the extension of time in which to file any such report, return,
document, declaration or other information.

        SECTION 4.15. ERISA. (a) Section 4.15(a) of Schedule 4.15 contains a
correct and complete list identifying each material "employee benefit plan", as
defined in Section 3(3) of the Employee Retirement Income Security Act of 1974
("ERISA"), each employment, severance or similar contract, plan, arrangement or
policy and each other plan or arrangement (written or oral) providing for
compensation, bonuses, profit-sharing, stock option or other stock related
rights or other forms of incentive or deferred compensation, vacation benefits,
insurance coverage (including any self-insured arrangements), health or medical
benefits, disability benefits, workers' compensation, supplemental unemployment
benefits, severance benefits and post-employment or retirement benefits
(including compensation, pension, health, medical or life insurance benefits)
which is maintained, administered or contributed to by the Company or any ERISA
Affiliate and covers any employee or former employee of the Company or any


                                       18
<PAGE>   23

Subsidiary, or with respect to which the Company or any Subsidiary has any
liability. Copies of such plans (and, if applicable, related trust agreements)
and all amendments thereto and written interpretations thereof have been
furnished, or will be made available upon request, to Buyer together with the
most recent annual report (Form 5500 including, if applicable, Schedule B
thereto) prepared in connection with any such plan. Such plans are referred to
collectively herein as the "EMPLOYEE PLANS". For purposes of this Section 4.15,
"ERISA AFFILIATE" of any Person means any other Person which, together with such
Person, would be treated as a single employer under Section 414 of the Code.

        (b) Neither the Company nor any ERISA Affiliate maintains, or has within
the past five years maintained, any plan that constitutes or constituted a
"multiemployer plan", as defined in Section 3(37) of ERISA, or that is or was
subject to Title IV of ERISA.

        (c) Each Employee Plan which is intended to be qualified under Section
401(a) of the Code is so qualified and has been so qualified during the period
from its adoption to date, and each trust forming a part thereof is exempt from
tax pursuant to Section 501(a) of the Code. The Company has furnished to the
Buyer copies of the most recent Internal Revenue Service determination letters
with respect to each such Plan. Each Employee Plan has been maintained in
compliance with its terms and with the requirements prescribed by any and all
statutes, orders, rules and regulations, including but not limited to ERISA and
the Code, which are applicable to such Plan.

        (d) Except as set forth on section 4.15(d) of Schedule 4.15, the
consummation of the transactions contemplated by this Agreement will not (i)
entitle any employee or independent contractor of the Company or any Subsidiary
to severance pay or (ii) accelerate the time of payment or vesting or trigger
any payment or funding (through a grantor trust or otherwise) of compensation or
benefits under, increase the amount payable or trigger any other material
obligation pursuant to, any Employee Plan. There is no contract, agreement, plan
or arrangement covering any employee or former employee of the Company or any
Affiliate that, individually or collectively, could give rise to the payment of
any amount that would not be deductible pursuant to the terms of Sections 162m
or 280G of the Code.

        (e) Neither the Company nor any Subsidiary has any liability in respect
of post-retirement health, medical or life insurance benefits for retired,
former or current employees of the Company or its Subsidiaries except as
required to avoid excise tax under Section 4980B of the Code.

        (f) Except as set forth on section 4.15(f) of Schedule 4.15, there has
been no amendment to, written interpretation or announcement (whether or not
written) by the Company or any of its Affiliates relating to, or change in
employee participation or coverage under, any Employee Plan which would increase
materially the expense of


                                       19
<PAGE>   24

maintaining such Employee Plan above the level of the expense incurred in
respect thereof for the fiscal year ended on the Balance Sheet Date.

        (g) Neither the Company nor any Subsidiary is a party to or subject to,
or is currently negotiating in connection with entering into, any collective
bargaining agreement or other contract or understanding with a labor union or
labor organization.

        (h) All contributions and payments accrued under each Employee Plan,
determined in accordance with prior funding and accrual practices, as adjusted
to include proportional accruals for the period ending at the Effective Time,
have been discharged and paid on or prior to the Effective Time except to the
extent reflected as a liability on the Balance Sheet.

        SECTION 4.16. Compliance with Laws. Neither the Company nor any
Subsidiary is in violation of, or has violated, any applicable provisions of any
laws, statutes, ordinances, regulations, judgments, injunctions, orders or
decrees. Neither the Company nor any Subsidiary has received any written notice
to the effect that the Company or any Subsidiary is not in compliance with any
applicable law, statute, ordinance, regulation, judgment, injunction, order or
decree.

        SECTION 4.17. Finders' Fees. Except for Covington Associates, a copy of
whose engagement agreement has been provided to Buyer, there is no investment
banker, broker, finder or other intermediary which has been retained by or is
authorized to act on behalf, of the Company or any Subsidiary who might be
entitled to any fee or commission from Buyer or any of its Affiliates upon
consummation of the transactions contemplated by this Agreement.

        SECTION 4.18. Patents and Other Proprietary Rights. The Company and
Subsidiaries have valid rights to use, whether through ownership, licensing or
otherwise, all patents, trademarks, service marks, trade names, copyrights,
trade secrets, licenses, information, proprietary rights and processes that are
necessary for its business as now conducted (collectively the "INTELLECTUAL
PROPERTY RIGHTS"). The Company and Subsidiaries have not assigned, hypothecated
or otherwise encumbered any of the Intellectual Property Rights and none of the
licenses included in the Intellectual Property Rights purport to grant sole or
exclusive licenses to another Person, including, without limitation sole or
exclusive licenses limited to specific fields of use. The patents owned by the
Company and Subsidiaries are valid and enforceable and any patent issuing from
patent applications of the Company and Subsidiaries will be valid and
enforceable, except as such invalidity or unenforceability, individually or in
the aggregate, could not reasonably be expected to have a Material Adverse
Effect. Except as disclosed in Schedule 4.18, (i) to the Company's knowledge,
there are no infringements by any other party of any of the Intellectual
Property Rights, and (ii) the Company and Subsidiaries have not entered into any
agreement to indemnify any other party against any charge of

                                       20
<PAGE>   25

infringement of any of its Intellectual Property Rights except for such matters
as would not, individually or in the aggregate, have a Material Adverse Effect.
Except as disclosed in Schedule 4.18, the Company and Subsidiaries have not and
do not violate or infringe any intellectual property right of any other Person,
and the Company and Subsidiaries have not received any communication alleging
that it violates or infringes the intellectual property right of any other
Person, except for any such violations or infringements as would not,
individually or in the aggregate, have a Material Adverse Effect. The Company
and Subsidiaries have not been sued for infringing any intellectual property
right of another Person. Except as disclosed in Schedule 4.18, none of the
processes, techniques and formulae, research and development results and other
know-how relating to the business of the Company and Subsidiaries, the value of
which to the Company is contingent upon maintenance of the confidentiality
thereof, has been disclosed by the Company or any of its Affiliates to any
Person other than those Persons who are bound to hold such information in
confidence pursuant to confidentiality agreements or by operation of law.

        SECTION 4.19. Real Property. Neither the Company nor any Subsidiary
owns, or has owned, any interest in real property.

        SECTION 4.20. Environmental Matters. (a) Except for such matters
individually or in the aggregate, as would not be reasonably expected to have a
Material Adverse Effect on the Company, and except as set forth in the Company
10-K:

                (i) no notice, notification, demand, request for information,
        citation, summons or order has been received, no complaint has been
        filed, no penalty has been assessed, and no investigation, action,
        claim, suit, proceeding or review (or any basis therefor) is pending or,
        to the knowledge of the Company or any Subsidiary, is threatened by any
        governmental entity or other Person with respect to any matters relating
        to the Company or any Subsidiary and relating to or arising out of any
        Environmental Law; and

                (ii) there are no liabilities of or relating to the Company or
        any Subsidiary of any kind whatsoever whether accrued, contingent,
        absolute, determined, determinable or otherwise, arising under or
        relating to any Environmental Law, and there are no facts, conditions,
        situations or set of circumstances that could reasonably be expected to
        result in or be the basis for any such liability; and

                (iii) the Company and its Subsidiaries are and have been in
        compliance with all Environmental Laws and have obtained and are in
        compliance with all Environmental Permits.


                                       21
<PAGE>   26

        (b) Except as set forth on Schedule 4.20, there has been no
environmental investigation, study, audit, test, review or other analysis
conducted of which the Company has knowledge in relation to the current or prior
business of the Company or any Subsidiary or any property or facility now or
previously owned, leased or operated by the Company or any Subsidiary which has
not been delivered to Buyer at least five days prior to the date hereof.

        (c) Neither the Company nor any Subsidiary owns, leases or operates or
has owned, leased or operated any real property, or conducts or has conducted
any operations, in New Jersey or Connecticut.

        (d) For purposes of this Section 4.20, the following terms shall have
the meanings set forth below:

                "COMPANY" and "SUBSIDIARY" shall include any entity which is, in
        whole or in part, a predecessor of the Company or any Subsidiary;

                "ENVIRONMENTAL LAWS" means any federal, state, local and foreign
        law (including, without limitation, common law), treaty, judicial
        decision, regulation, rule, judgment, order, decree, injunction, permit
        or governmental restriction or requirement or any agreement or contract
        with any governmental authority or other third party, whether now or
        hereinafter in effect, relating to human health and safety, the
        environment or to pollutants, contaminants, wastes or chemicals or any
        toxic, radioactive, ignitable, corrosive, reactive or otherwise
        hazardous substances, wastes or materials;

                "ENVIRONMENTAL PERMITS" means all permits, licenses, franchises,
        certificates, approvals and other similar authorizations of governmental
        authorities relating to or required by Environmental Laws and affecting
        the business of the Company or any of its Subsidiaries as currently
        conducted.

        SECTION 4.21. Year 2000 Compliance. (a) Except as set forth on Schedule
4.21(a), all software (other than software licensed from third parties ("THIRD
PARTY SOFTWARE")) that is sold or provided by the Company or any Subsidiary
("COMPANY SOFTWARE"), is Year 2000 Compliant. For purposes of this Section,
"YEAR 2000 COMPLIANT" means software that is able accurately to process
(including without limitation calculate, compare and sequence) date and time
data from, into and between the years 1999 and 2000 and any other years in the
20th and 21st centuries when operated on the hardware and operating system
platforms identified in Schedule 4.21(a)

       (b) To the extent that any Third Party Software that is provided with the
Company Software may affect date or time data or the processing of date or time
data by the Company Software, any such Third Party Software will operate in
conjunction with


                                       22
<PAGE>   27

the Company Software in a manner that allows the Company Software to be Year
2000 Compliant.

                                    ARTICLE 5
                     REPRESENTATIONS AND WARRANTIES OF BUYER

        Buyer represents and warrants to the Company that:

        SECTION 5.01. Corporate Existence and Power. Each of Buyer and Merger
Subsidiary is a corporation duly incorporated, validly existing and in good
standing under the laws of the State of Delaware and has all corporate powers
and all material governmental licenses, authorizations, consents and approvals
required to carry on its business as now conducted. Since the date of its
incorporation, Merger Subsidiary has not engaged in any activities other than in
connection with or as contemplated by this Agreement or in connection with
arranging any financing required to consummate the transactions contemplated
hereby.

        SECTION 5.02. Corporate Authorization. Each of Buyer and Merger
Subsidiary has all requisite corporate power and corporate authority to enter
into this Agreement and to consummate the transactions contemplated hereby. The
execution and delivery of this Agreement and the consummation by each of the
Buyer and Merger Subsidiary of the transactions contemplated hereby have been
duly authorized by all necessary corporate action on the part of the Buyer or
Merger Subsidiary, respectively. This Agreement has been duly executed and
delivered by each of Buyer and Merger Subsidiary and constitutes a valid and
binding agreement of each of Buyer and Merger Subsidiary, enforceable against
each in accordance with its terms, except as such enforceability may be limited
by bankruptcy, insolvency, reorganization, moratorium and other similar laws
relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).

        SECTION 5.03. Governmental Authorization. The execution, delivery and
performance by Buyer and Merger Subsidiary of this Agreement and the
consummation by Buyer and Merger Subsidiary of the transactions contemplated by
this Agreement require no action by or in respect of, or filing with, any
governmental body, agency, official or authority other than (a) the filing of
the Certificate of Merger in accordance with Delaware Law, (b) compliance with
any applicable requirements of the HSR Act; and (c) compliance with any
applicable requirements of the Exchange Act.

        SECTION 5.04. Non-contravention. The execution, delivery and performance
by Buyer and Merger Subsidiary of this Agreement and the consummation by Buyer
and

                                       23
<PAGE>   28

Merger Subsidiary of the transactions contemplated hereby do not and will not
(a) contravene or conflict with the certificate of incorporation or bylaws of
Buyer or of Merger Subsidiary, (b) assuming compliance with the matters referred
to in Section 5.03, contravene or conflict with any provision of law,
regulation, judgment, order or decree binding upon Buyer or Merger Subsidiary,
or (c) constitute a default under or give rise to any right of termination,
cancellation or acceleration of any right or obligation of Buyer or Merger
Subsidiary or to a loss of any benefit to which Buyer or Merger Subsidiary is
entitled under any agreement, contract or other instrument binding upon Buyer or
Merger Subsidiary, except, in the case of (b) and (c), for such matters as would
not materially adversely effect the ability of Buyer and Merger Subsidiary to
consummate the transactions contemplated by this Agreement.

        SECTION 5.05. Disclosure Documents. (a) The information with respect to
Buyer and its subsidiaries that Buyer furnishes to the Company in writing
specifically for use in any Company Disclosure Document will not contain any
untrue statement of a material fact or omit to state any material fact necessary
in order to make the statements made therein, in the light of the circumstances
under which they were made, not misleading (i) in the case of the Company Proxy
Statement at the time the Company Proxy Statement or any amendment or supplement
thereto is first mailed to stockholders of the Company and at the time the
stockholders vote on adoption of this Agreement and (ii) in the case of any
Company Disclosure Document other than the Company Proxy Statement, at the time
of the filing thereof, at the time of any distribution thereof, and at the time
of consummation of the Offer.

        (b) The Offer Documents, when filed, will comply as to form in all
material respects with the applicable requirements of the Exchange Act and will
not at the time of the filing thereof, at the time of any distribution thereof
or at the time of consummation of the Offer, contain any untrue statement of a
material fact or omit to state any material fact necessary to make the
statements made therein, in the light of the circumstances under which they were
made, not misleading, provided that this representation and warranty will not
apply to statements or omissions in the Offer Documents based upon information
furnished to Buyer or Merger Subsidiary in writing by the Company specifically
for use therein.

                                    ARTICLE 6
                            COVENANTS OF THE COMPANY

        SECTION 6.01. Conduct of the Company. From the date hereof until the
Effective Time, the Company and the Subsidiaries shall conduct their business in
the ordinary course consistent with past practice and shall use their best
efforts to preserve intact their

                                       24
<PAGE>   29

business organizations and relationships with third parties and to keep
available the services of their present officers and employees. Without limiting
the generality of the foregoing, from the date hereof until the Effective Time:

        (a) the Company will not adopt or propose any change in its Certificate
of Incorporation or bylaws;

        (b) the Company will not, and will not permit any Subsidiary to, merge
or consolidate with any other Person or acquire a material amount of assets of
any other Person;

        (c) the Company will not, and will not permit any Subsidiary to, sell,
lease, license or otherwise dispose of any material assets or property except
(i) pursuant to existing contracts or commitments and (ii) in the ordinary
course consistent with past practice;

        (d) the Company will not, and will not permit any Subsidiary to, settle
or compromise any suit or claims or threatened suit or claim relating to the
transactions contemplated hereby;

        (e) the Company will not, and will not permit any Subsidiary to (i) take
agree or commit to take any action that would make any representation and
warranty of the Company hereunder (including without limitation, the Company's
representations and warranties set forth in Section 4.10) inaccurate in any
respect at, or as of any time prior to, the Effective Time or (ii) omit or agree
or commit to omit to take any action necessary to prevent any such
representation or warranty (including without limitation, the Company's
representations and warranties set forth in Section 4.10) from being inaccurate
in any respect at any such time; and

        (f) the Company will not, and will not permit any Subsidiary to, agree
or commit to do any of the foregoing.

        SECTION 6.02. Tax Certification. At any time during the period beginning
on the date hereof and ending at the Effective Time, the Company shall provide
to Buyer, within two business days of a request by Buyer, a certificate meeting
the requirements of Treas. Reg. Section 1.897-2(h) to the effect that the
Company is not, nor has it been within 5 years of the date thereof, a "United
States real property holding corporation" as defined in Section 897 of the
Code."

        SECTION 6.03. Stockholder Meeting; Proxy Material. The Company shall
cause a meeting of its stockholders (the "COMPANY STOCKHOLDER MEETING") to be
duly called and held as soon as reasonably practicable following the
consummation of the Offer for the purpose of voting on the approval and adoption
of this Agreement, unless a vote shall not

                                       25
<PAGE>   30

be required under Delaware Law. The Directors of the Company shall, except as is
required in order to comply with the fiduciary duties of the Board of Directors
under applicable law as advised in writing by Company Counsel, recommend
approval and adoption of this Agreement by the Company's stockholders. In
connection with such meeting, the Company (a) will promptly prepare and file
with the SEC, will use its best efforts to have cleared by the SEC and will
thereafter mail to its stockholders as promptly as practicable the Company Proxy
Statement and all other proxy materials for such meeting, (b) will use its best
efforts to obtain the necessary approvals by its stockholders of this Agreement
and the transactions contemplated hereby and (c) will otherwise comply with all
legal requirements applicable to such meeting.

        SECTION 6.04. Access to Information. From the date hereof until the
Effective Time, the Company will give Buyer, its counsel, financial advisors,
auditors and other authorized representatives reasonable access to the offices,
properties, books and records (including tax records) of the Company and the
Subsidiaries, will furnish to Buyer, its counsel, financial advisors, auditors
and other authorized representations such financial and operating data and other
information as such Persons may reasonably request, will instruct the Company's
employees, counsel and financial advisors to cooperate with Buyer in its
investigation of the business of the Company and the Subsidiaries and will
arrange for meetings between Buyer, its counsel, financial advisors, auditors
and other authorized representatives and the key employees of the Company and
the Subsidiaries listed on Schedule 6.04; provided that no investigation
pursuant to this Section 6.04, shall affect any representation or warranty given
by the Company to Buyer hereunder.

        SECTION 6.05. Other Offers. From the date hereof until the termination
hereof, the Company and the Subsidiaries and the officers, directors, employees
or other agents of the Company and the Subsidiaries will not, directly or
indirectly, (i) take any action to solicit, initiate or encourage any
Acquisition Proposal or (ii) except as may be required, in response to an
unsolicited bona fide written Acquisition Proposal, in order to comply with the
fiduciary duties of the Board of Directors under applicable law as advised in
writing by Company Counsel, engage in negotiations with, or disclose any
nonpublic information relating to the Company or any Subsidiary or afford access
to the properties, books or records of the Company or any Subsidiary to, any
Person. The Company will promptly (and in no event later than 24 hours after
receipt of the relevant Acquisition Proposal) notify (which notice shall be
provided orally and in writing and shall identify the Person making the relevant
Acquisition Proposal and set forth the material terms thereof) Buyer after (i)
the Company has received any Acquisition Proposal, (ii) the Company has been
advised that any Person is considering making an Acquisition Proposal, or (iii)
the Company has received any request for nonpublic information relating to the
Company or any Subsidiary, or for access to the properties, books or records of
the Company or any Subsidiary, by any Person. The Company will keep Buyer fully
informed of the status and details of any such Acquisition Proposal or request.
In addition to the foregoing provisions of this Section 6.05, the Company shall
not engage in

                                       26
<PAGE>   31

negotiations with, or disclose any nonpublic information to, any such Person
unless it receives from such Person an executed confidentiality agreement with
terms no less favorable to the Company than the Non-Disclosure Agreement. The
Company shall, and shall cause its Subsidiaries and the Company's directors,
officers, employees, financial advisors and other agents or representatives to,
cease immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. For purposes of this Agreement, "ACQUISITION PROPOSAL"
means any offer or proposal for a merger or other business combination involving
the Company or any Subsidiary, the acquisition of any equity interest in, or a
substantial portion of the assets of, the Company or any Subsidiary, other than
the transactions contemplated by this Agreement, however, Acquisition Proposal
shall not include sales of products or services made in the ordinary course of
business consistent with past practices.

        SECTION 6.06. Notices of Certain Events. The Company shall promptly
notify Buyer of:

        (a) any notice or other communication from any Person alleging that the
consent of such Person is or may be required in connection with the transactions
contemplated by this Agreement;

        (b) any notice or other communication from any governmental or
regulatory agency or authority in connection with the transactions contemplated
by this Agreement; and

        (c) any actions, suits, claims, investigations or proceedings commenced
or, to its knowledge threatened which, if pending on the date of this Agreement,
would have been required to have been disclosed pursuant to Section 4.13 or
which relate to the consummation of the transactions contemplated by this
Agreement.

                                    ARTICLE 7
                               COVENANTS OF BUYER

        SECTION 7.01. Obligations of Merger Subsidiary. Buyer will take all
action necessary to cause Merger Subsidiary to perform its obligations under
this Agreement and to consummate the Merger on the terms and conditions set
forth in this Agreement.

        SECTION 7.02. Voting of Shares. Buyer agrees to vote all Shares
beneficially owned by it in favor of adoption of this Agreement at the Company
Stockholder Meeting.


                                       27
<PAGE>   32

        SECTION 7.03. Director and Officer Liability. For six years after the
Effective Time, Buyer will cause the Surviving Corporation to indemnify and hold
harmless the present and former officers and directors of the Company in respect
of acts or omissions occurring prior to the Effective Time to the extent
provided under the Company's Certification of Incorporation and bylaws in effect
on the date hereof; provided that such indemnification shall be subject to any
limitation imposed from time to time under applicable law. For six years after
the Effective Time, Buyer will cause the Surviving Corporation to use its best
efforts to provide officers' and directors' liability insurance in respect of
acts or omissions occurring prior to the Effective Time covering each such
Person currently covered by the Company's officers' and directors' liability
insurance policy on terms with respect to coverage and amount no less favorable
than those of such policy in effect on the date hereof; provided that in
satisfying its obligation under this Section, Buyer shall not be obligated to
cause the Surviving Corporation to pay premiums in excess of 150% of the amount
per annum the Company paid in the twelve months ended December 31, 1998, which
amount is $140,431. Buyer, Merger Subsidiary and the Company acknowledge and
agree that any directors and officers, present or former, of the Company are
third party beneficiaries under this Section 7.03 and, as such, shall be
entitled to the benefits of all covenants and obligations of Buyer hereunder.


                                       ARTICLE 8
                          COVENANTS OF BUYER AND THE COMPANY

        SECTION 8.01. Reasonable Best Efforts. Subject to the terms and
conditions of this Agreement, each party will use its reasonable best efforts to
take, or cause to be taken, all actions and to do, or cause to be done, all
things necessary, proper or advisable under applicable laws and regulations to
consummate the transactions contemplated by this Agreement.

        SECTION 8.02. Certain Filings. The Company and Buyer shall cooperate
with one another (a) in connection with the preparation of the Company
Disclosure Documents and the Offer Documents, (b) in determining whether any
action by or in respect of, or filing with, any governmental body, agency or
official, or authority is required, or any actions, consents, approvals or
waivers are required to be obtained from parties to any material contracts, in
connection with the consummation of the transactions contemplated by this
Agreement and (c) in seeking any such actions, consents, approvals or waivers or
making any such filings, furnishing information required in connection therewith
or with the Company Disclosure Documents or the Offer Documents and seeking
timely to obtain any such actions, consents, approvals or waivers.


                                       28
<PAGE>   33

        SECTION 8.03. Public Announcements. Buyer and the Company will consult
with each other before issuing any press release or making any public statement
with respect to this Agreement and the transactions contemplated hereby and,
except as may be required by applicable law or any listing agreement with any
national securities exchange or automated quotation system, will not issue any
such press release or make any such public statement prior to such consultation.

        SECTION 8.04. Further Assurances. At and after the Effective Time, the
officers and directors of the Surviving Corporation will be authorized to
execute and deliver, in the name and on behalf of the Company or Merger
Subsidiary, any deeds, bills of sale, assignments or assurances and to take and
do, in the name and on behalf of the Company or Merger Subsidiary, any other
actions and things to vest, perfect or confirm of record or otherwise in the
Surviving Corporation any and all right, title and interest in, to and under any
of the rights, properties or assets of the Company acquired or to be acquired by
the Surviving Corporation as a result of, or in connection with, the Merger.


                                    ARTICLE 9
                            CONDITIONS OF THE MERGER

        SECTION 9.01. Conditions to the Obligations of Each Party. The
obligations of the Company, Buyer and Merger Subsidiary to consummate the Merger
are subject to the satisfaction of the following conditions:

        (a) if required by Delaware Law, this Agreement shall have been adopted
by the stockholders of the Company in accordance with such law;

        (b) any applicable waiting period under the HSR Act relating to the
Merger shall have expired or has been terminated;

        (c) no provision of any applicable law or regulation and no judgment,
injunction, order or decree shall prohibit the consummation of the Merger; and

        (d) Buyer shall have purchased Shares pursuant to the Offer.


                                       29
<PAGE>   34

                                   ARTICLE 10
                                   TERMINATION

        SECTION 10.01. Termination. This Agreement may be terminated and the
Merger may be abandoned at any time prior to the Effective Time (notwithstanding
any approval of this Agreement by the stockholders of the Company):

        (a) by mutual written consent of the Company and Buyer;

        (b) by either the Company or Buyer, if the Offer has not been
consummated by June 30, 1999;

        (c) by either the Company or Buyer, if there shall be any law or
regulation that makes consummation of the Offer or the Merger illegal or
otherwise prohibited or if any judgment, injunction, order or decree enjoining
Buyer or the Company from consummating the Offer or the Merger is entered and
such judgment, injunction, order or decree shall become final and nonappealable;

        (d) by Buyer, if this Agreement shall not have been approved and adopted
by a majority of the Shares entitled to vote as required under Delaware Law by
reason of the failure to obtain the required vote at a duly held meeting of
stockholders or any adjournment thereof;

        (e) by Buyer, in the event of any breach by any stockholder of any of
such stockholder's obligations under any of the Stockholder Agreements dated as
of the date hereof entered into by Merger Subsidiary and the stockholders listed
on Schedule 10.01(e) hereto (the "STOCKHOLDER AGREEMENTS");

        (f) by Buyer, if (i) the Company shall have entered into, or shall have
publicly announced its intention to enter into, an agreement with respect to any
Acquisition Proposal, or (ii) the Board of Directors of the Company shall have
withdrawn or modified in a manner adverse to Buyer the Board's approval or
recommendation of the Offer or the Merger;

        (g) by Buyer, if the Company shall have breached or failed to observe or
perform any of its representations or obligations under Section 1.02, 6.03 or
6.05; or

        (h) by Company, upon payment to Buyer of the amounts referred to in
Section 11.04(b), if prior to a duly called meeting of the stockholders of the
Company for the purpose of voting on the approval and adoption of this
Agreement, the Board of Directors of the Company shall have withdrawn or
modified in a manner adverse to Buyer its approval or recommendation of the
Offer or the Merger in order to permit Company to


                                       30
<PAGE>   35

execute an agreement in connection with an Acquisition Proposal with respect to
the Company which the Board of Directors of the Company determines in good faith
(based on the presentation of an investment banking firm of national reputation)
to be more favorable to the Company's stockholders than the Merger.

        The party desiring to terminate this Agreement pursuant to any of
clauses (b) through (h) above shall give written notice of such termination to
the other party in accordance with Section 11.01.

        SECTION 10.02. Effect of Termination. If this Agreement is terminated
pursuant to Section 10.01, this Agreement shall become void and of no effect
with no liability on the part of any party hereto, except that (a) the
agreements contained in this Section 10.02 and Section 11.04 shall survive the
termination hereof and (b) no such termination shall relieve any party of any
liability or damages resulting from any breach by that party of any provision of
this Agreement.


                                   ARTICLE 11
                                  MISCELLANEOUS

        SECTION 11.01. Notices. All notices, requests and other communications
to any party hereunder shall be in writing (including telecopy or similar
writing) and shall be given,

               if to Buyer or Merger
                      Subsidiary to:     Science Applications
                                         International Corporation
                                         1241 Cave Street
                                         La Jolla, CA 92037
                                         Attention: William Roper
                                         Fax: (619) 546-6660

                     with copies to:     Science Applications
                                         International Corporation
                                         10260 Campus Point Drive, M/S F3
                                         San Diego, California 92121
                                         Attention: Kevin A. Werner
                                         Fax: (619) 535-7992


                                       31
<PAGE>   36

                                and:     Davis Polk & Wardwell
                                         450 Lexington Avenue
                                         New York, NY 10017
                                         Att.: David L. Caplan
                                         Fax: (212) 450-4800


               if to the Company to:     Oacis Healthcare Holdings Corp.
                                         1101 Fifth Avenue
                                         Suite 200
                                         San Rafael, CA 94901
                                         Att.: Stephen Ghiglieri
                                         Fax: (415) 482-4640

                     with copies to:     Cooley Godward LLP
                                         One Maritime Plaza
                                         20th Floor
                                         San Francisco, CA 94111
                                         Att.: Kenneth L. Guernsey
                                         Fax: (415) 951-3699


or such other address or telecopy number as such party may hereafter specify for
the purpose by notice to the other parties hereto. Each such notice, request or
other communication shall be effective (a) if given by telecopy, when such
telecopy is transmitted to the telecopy number specified in this Section and the
appropriate telecopy confirmation is received or (b) if given by any other
means, when delivered at the address specified in this Section.

        SECTION 11.02. Survival of Representations and Warranties. The
representations and warranties and agreements contained herein and in any
certificate or other writing delivered pursuant hereto shall not survive the
Effective Time or the termination of this Agreement except for the agreements
set forth in Section 11.04.

        SECTION 11.03. Amendments; No Waivers. (a) Any provision of this
Agreement may be amended or waived prior to the Effective Time if, and only if,
such amendment or waiver is in writing and signed, in the case of an amendment,
by the Company, Buyer and Merger Subsidiary or in the case of a waiver, by the
party against whom the waiver is to be effective; provided that after the
adoption of this Agreement by the stockholders of the Company, no such amendment
or waiver shall, without the further approval of such stockholders, alter or
change (i) the amount or kind of consideration to be received in exchange for
any shares of capital stock of the Company, (ii) any term of the certificate of


                                       32
<PAGE>   37

incorporation of the Surviving Corporation or (iii) any of the terms or
conditions of this Agreement if such alteration or change would adversely affect
the holders of any shares of capital stock of the Company.

        (b) No failure or delay by any party in exercising any right, power or
privilege hereunder shall operate as a waiver thereof nor shall any single or
partial exercise thereof preclude any other or further exercise thereof or the
exercise of any other right, power or privilege. The rights and remedies herein
provided shall be cumulative and not exclusive of any rights or remedies
provided by law.

        SECTION 11.04. Fees and Expenses. (a) Except as otherwise provided in
this Section, all costs and expenses incurred in connection with this Agreement
shall be paid by the party incurring such cost or expense.

        (b) The Company agrees that it will pay Buyer a fee in immediately
available funds equal to $2,500,000 promptly, but in no event later than two
business days, if:

                (i) this Agreement is terminated pursuant to any of clauses (e)
        through (h) of Section 10.01; or

                (ii) (A) prior to the termination of this Agreement, an
        Acquisition Proposal is commenced, publicly proposed or publicly
        disclosed and (B) this Agreement is terminated pursuant to Section
        10.01(b) or 10.01(d).

        SECTION 11.05. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns, provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of the other parties hereto except that Buyer may transfer
or assign, in whole or from time to time in part, to one or more of its
Affiliates, the right to purchase Shares pursuant to the Offer, but any such
transfer or assignment will not relieve Buyer of its obligations under the Offer
or prejudice the rights of tendering stockholders to receive payment for Shares
validly tendered and accepted for payment pursuant to the Offer.

        SECTION 11.06. Governing Law. This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware.

        SECTION 11.07. Counterparts; Effectiveness; Third Party. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective when each party hereto shall
have received counterparts hereof signed by all of the other parties hereto.
Except for Section 7.03

                                       33
<PAGE>   38
hereof, no provision of this Agreement is intended to confer upon any Person
other than the parties hereto any rights or remedies hereunder.

        SECTION 11.08. Entire Agreement. This Agreement and Mutual
Non-Disclosure Agreement effective as of November 4, 1998 between Buyer and the
Company ("NON-DISCLOSURE AGREEMENT") constitute the entire agreement among
Buyer, Merger Subsidiary and the Company with respect to the subject matter
hereof and supersede all prior agreements and understandings, both written and
oral, among Buyer, Merger Subsidiary and the Company with respect to the subject
matter hereof.

        SECTION 11.09. Definitions. Each of the following terms is defined in
the Section set forth opposite such term:


<TABLE>
<CAPTION>
Term                                                    Section
- ----                                                    -------
<S>                                                      <C> 
Acquisition Proposal                                      6.05
Affiliate                                                 1.03
Certificate of Merger                                     2.01
Balance Sheet                                             4.08
Balance Sheet Date                                        4.08
Certificate of Incorporation                              4.01
Code                                                      2.05
Common Stock                                              1.01
Company Counsel                                           1.02
Company Disclosure Documents                              4.09
Company Proxy Statement                                   4.09
Company Securities                                        4.05
Company Software                                          4.21
Company Stockholder Meeting                               6.03
Company 10-K                                              4.06
Company 10-Qs                                             4.07
Non-Disclosure Agreement                                 11.08
Effective Time                                            2.01
Employee Plans                                            4.15
Environmental Laws                                        4.20
Environmental Permits                                     4.20
ERISA                                                     4.15
ERISA Affiliate                                           4.15
Exchange Act                                              4.03
Exchange Agent                                            2.03
Delaware Law                                              1.02
HSR Act                                                   4.03
Intellectual Property Rights                              4.18
IRS                                                       4.14
- --------------------------------------------------------------
</TABLE>


                                       34
<PAGE>   39

<TABLE>
<S>                                                      <C> 
Lien                                                      4.04
Material Adverse Effect                                   4.01
Merger                                                    2.01
Merger Consideration                                      2.02
Minimum Condition                                         1.01
Offer                                                     1.01
Offer Documents                                           1.01
Person                                                    2.03
Related Financial Statements                              4.08
Schedule 14D-9                                            1.02
SEC                                                       4.07
Shares                                                    1.01
Stockholder Agreements                                   10.01
Subsidiary                                                4.06
Subsidiary Securities                                     4.06
Substitute Option                                         2.05
Surviving Corporation                                     2.01
Taxes                                                     4.14
Taxing Authority                                          4.14
Tax Return                                                4.14
Third Party Software                                      4.21
Year 2000 Compliant                                       4.21
</TABLE>


                                       35
<PAGE>   40

        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as an instrument under seal by their respective authorized
officers as of the day and year first above written.

                                    OACIS HEALTHCARE HOLDINGS CORP.


                                    By: /s/  JIM MCCORD
                                       -----------------------------------------
                                        NAME: Jim McCord
                                        TITLE: Chief Executive Officer


                                    SCIENCE APPLICATIONS INTERNATIONAL
                                    CORPORATION


                                    By: /s/ WILLIAM A. ROPER, JR.
                                       -----------------------------------------
                                        NAME: William A. Roper, Jr.
                                        TITLE: Senior Vice President and
                                               Chief Financial Officer


                                    OSCAR ACQUISITION CORPORATION


                                    By: /s/  DAVID A. COX
                                       -----------------------------------------
                                        NAME: David A. Cox
                                        TITLE: President



                                       36
<PAGE>   41

                                                                         ANNEX I


        Notwithstanding any other provision of the Offer, Buyer shall not be
required to accept for payment or pay for any Shares, and may terminate the
Offer, if (i) the Minimum Condition has not been satisfied by June 30, 1999,
(ii) the applicable waiting period under the HSR Act shall not have expired or
been terminated by June 30, 1999, or (iii) at any time on or after the date
hereof and prior to the acceptance for payment of Shares, any of the following
conditions exist:

        (a) there shall be threatened, instituted or pending any action, suit,
investigation or proceeding (collectively a "Proceeding") (1) by any Person,
foreign or domestic (except a government or governmental authority or agency,
domestic or foreign (each, a "Governmental Authority")), if there is a
reasonable possibility that such Proceeding will be decided in such Person's
favor or (2) by any Governmental Authority, in any case, before any court or
governmental authority or agency, domestic or foreign, (i) challenging or
seeking to in make illegal, to delay materially or otherwise directly or
indirectly to restrain or prohibit the making of the Offer, the acceptance for
payment of or payment for some of or all the Shares pursuant to the Offer or the
consummation of the Merger, seeking to obtain material damages or otherwise
directly or indirectly relating to the transactions contemplated by the Offer or
the Merger, (ii) seeking to restrain or prohibit Buyer's ownership or operation
(or that of its subsidiaries or Affiliates) of all or any material portion of
the business or assets of the Company and the Subsidiaries, taken as a whole, or
of Buyer and its subsidiaries, taken as a whole, or to compel Buyer or any of
its subsidiaries or Affiliates to dispose of or hold separate all or any
material portion of the business or assets of the Company and the Subsidiaries,
taken as a whole, or of Buyer and its subsidiaries, taken as a whole, (iii)
seeking to impose or confirm material limitations on the ability of Buyer or any
of its subsidiaries or Affiliates effectively to exercise full rights of
ownership of the Shares, including, without limitation, the right to vote any
Shares acquired or owned by Buyer or any of its subsidiaries or Affiliates on
all matters properly presented to the Company's stockholders, (iv) seeking to
require divestiture by Buyer or any of its subsidiaries or Affiliates of any
Shares, or (v) that otherwise would, individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect on the Company and its
subsidiaries, taken as a whole, or Buyer and its subsidiaries, taken as a whole;
or

        (b) there shall be any action taken, or any statute, rule, regulation,
injunction, order or decree proposed, enacted, enforced, promulgated, issued or
deemed applicable to the Offer or the Merger, by any court, government or
governmental authority or agency, domestic or foreign other than the application
of the waiting period provisions of the HSR Act to the Offer or the Merger that
is reasonably likely, directly or indirectly, to result in any of the
consequences referred to in clauses (i) through (v) of paragraph (a) above; or



<PAGE>   42
        (c) the Company shall have breached or failed to perform in any material
respect any of its covenants or agreements under the Merger Agreement, or any of
the representations and warranties of the Company set forth in the Merger
Agreement shall not be true when made or at any time prior to consummation of
the Offer as if made at and as of such time; provided, however, that in the
event that Section 4.21 of the Merger Agreement is not true, then Buyer shall be
required to accept for payment and pay for all Shares validly tendered and not
withdrawn, so long as the Company has (i) cured such inaccuracy prior to the
consummation of the Offer or (ii) demonstrated to Buyer that such inaccuracy can
be cured without having a Material Adverse Effect on the Company and its
Subsidiaries, taken as a whole; or

        (d) the Company shall have entered into, or shall have publicly
announced its intention to enter into, an agreement or an agreement in principle
with respect to any Acquisition Proposal or the Board of Directors of the
Company shall have withdrawn or modified in a manner adverse to Buyer the
Board's approval or recommendation of the Offer or the Merger; or

        (e) any Person or group (as defined in Section 13(d)(3) of the Exchange
Act) (other than Buyer, the Merger Subsidiary or any Affiliate thereof) shall
have acquired beneficial ownership (as defined in Rule 13d-3 promulgated under
the Exchange Act) of a majority of the outstanding Shares through the
acquisition of stock, the formation of a group or otherwise, or shall have been
granted any option, right or warrant, conditional or otherwise, to acquire
beneficial ownership of more than 50% of the Shares; or

        (f) the Merger Agreement shall have been terminated in accordance with
its terms, 

which in the reasonable judgment of Buyer in any such case, and
regardless of the circumstances (including any action or omission by Buyer)
giving rise to any such condition, makes it inadvisable to proceed with such
acceptance for payment or payment.

        The foregoing conditions are for the sole benefit of Buyer and Merger
Subsidiary and may, subject to the terms of the Agreement, be waived by Buyer
and Merger Subsidiary in whole or in part at any time and from time to time in
their discretion. The failure by Buyer or Merger Subsidiary at any time to
exercise any of the foregoing rights shall not be deemed a waiver of any such
right, the waiver of any such right with respect to particular facts and
circumstances shall not be deemed a waiver with respect to any other facts and
circumstances, and each such right shall be deemed an ongoing right that may be
asserted at any time and from time to time prior to the Effective Time.


                                       2



<PAGE>   1
                                                                       EXHIBIT 2

                              STOCKHOLDER AGREEMENT

        STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and Information
Partners Capital Fund, L.P. ("STOCKHOLDER").

        WHEREAS, in order to induce Buyer and Science Applications International
Corporation, a Delaware corporation ("PARENT"), to enter into an agreement and
plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare Holdings Corp., a
Delaware corporation (the "COMPANY"), Buyer has required that Stockholder, and
Stockholder has agreed to, enter into this Agreement; and

        WHEREAS, the Merger Agreement provides, among other things, upon the
terms and subject to the conditions thereof, for the acquisition by Buyer of all
the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

        WHEREAS, as of the date hereof, Stockholder owns (both beneficially and
of record) 1,603,525 shares of Company Common Stock and holds warrants to
purchase 135,757 shares of Company Common Stock.

        NOW, THEREFORE, the parties hereto agree as follows:


                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

        SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably and
unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired

<PAGE>   2


by purchase, exercise of options or otherwise, at any time after the date hereof
and prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

        SECTION 1.02. Voting Agreement. (a) Stockholder hereby irrevocably and
unconditionally agrees to vote or cause to be voted all Shares that such
Stockholder is entitled to vote at the time of any vote of the stockholders of
the Company where such matters arise (i) in favor of the approval and adoption
of the Merger Agreement and in favor of the transactions contemplated thereby
and (ii) against any (A) Acquisition Proposal (other than the Merger), (B)
reorganization, recapitalization, liquidation or winding up of the Company or
any other extraordinary transaction involving the Company, (C) corporate action
the consummation of which would frustrate the purposes, or prevent or delay the
consummation, of the transactions contemplated by the Merger Agreement or (D)
other matter relating to, or in connection with, any of the matters referred to
in clause (A), (B) or (C) above.

       (b) If any stockholder vote in respect of the Merger Agreement or any of
the transactions contemplated by the Merger Agreement is taken by written
consent, the provisions of this Agreement imposing obligations in respect of or
in connection with any vote of stockholders shall apply mutatis mutandis to such
action by written consent.

        SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably and
unconditionally revokes any and all previous proxies granted with respect to the
Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute


                                       2
<PAGE>   3

such further documents as may be required to vest in Buyer the sole power to
vote the Shares during the term of the proxy granted herein.


                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

        Stockholder represents and warrants to Buyer that:

        SECTION 2.01. Corporate Authorization; Binding Effect. Stockholder has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Stockholder of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

        SECTION 2.02. Non-Contravention; Governmental Authorization. (a) The
execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

       (b) The execution and delivery of this Agreement by Stockholder does not,
and the performance of this Agreement by Stockholder shall not, require any
consent, approval, authorization or permit of, or filing with or notification
to, any governmental or regulatory authority, domestic or foreign, except for
applicable


                                       3
<PAGE>   4

requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

        SECTION 2.03. Ownership of Shares. Stockholder is the sole, true,
lawful, beneficial and record owner of (a) 1,603,525 Shares and (b) warrants to
purchase 135,757 shares of Company Common Stock free and clear of any Lien and
any other limitation or restriction (including any restriction on the right to
vote or otherwise dispose of the Shares). Upon delivery of the Shares and
payment of the purchase price therefor, Buyer will receive good and marketable
title to the Shares free and clear of any pledge, lien, security interest,
charge, claim, equity, option, proxy, voting restriction or encumbrance of any
kind. None of the Shares is subject to any voting trust or other agreement or
arrangement with respect to the voting of such Shares.

        SECTION 2.04. Total Shares. Except for the Shares and warrants referred
to in 2.03, Stockholder does not beneficially own any (i) shares of capital
stock or voting securities of the Company, (ii) securities of the Company
convertible into or exchangeable for shares of capital stock or voting
securities of the Company or (iii) options or other rights to acquire from the
Company any capital stock, voting securities or securities convertible into or
exchangeable for capital stock or voting securities of the Company.

        SECTION 2.05. Finder's Fees. No investment banker, broker, finder or
other intermediary is entitled to a fee or commission from Buyer or the Company
in respect of this Agreement based upon any arrangement or agreement made by or
on behalf of Stockholder.


                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

        Buyer represents and warrants to Stockholder:

        SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has all
requisite corporate power and corporate authority to enter into this Agreement
and to consummate the transactions contemplated hereby. The execution and
delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by


                                       4
<PAGE>   5

bankruptcy, insolvency, reorganization, moratorium and other similar laws
relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).


                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

        Stockholder hereby covenants and agrees that:

        SECTION 4.01. No Proxies for, Encumbrances or Transfers of Shares.
Except pursuant to the terms of this Agreement, Stockholder shall not, without
the prior written consent of Buyer, directly or indirectly, (i) grant any
proxies or enter into any voting trust or other agreement or arrangement with
respect to the voting of any Shares or any options, warrants or other rights to
acquire Company Common Stock or (ii) sell, assign, transfer, encumber, mortgage,
or otherwise dispose of, or enter into any contract, option or other arrangement
or understanding with respect to the direct or indirect sale, assignment,
transfer, encumbrance, mortgage or other disposition of, any Shares or any
options, warrants or other rights to acquire Company Common Stock during the
term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

        SECTION 4.02. Other Offers. From the date hereof until the termination
hereof, Stockholder and the officers, directors, employees or other agents of
Stockholder will not, directly or indirectly, (i) take any action to solicit,
initiate or encourage any Acquisition Proposal or (ii) engage in negotiations
with, or disclose any nonpublic information relating to the Company or any
Subsidiary or afford access to the properties, books or records of the Company
or any Subsidiary to, any Person. Stockholder will promptly (and in no event
later than 24 hours after receipt of the relevant Acquisition Proposal) notify
(which notice shall be provided orally and in writing and shall identify the
Person making the relevant Acquisition Proposal and set forth the material terms
thereof) Buyer after (i) such Stockholder has received any Acquisition Proposal,
(ii) such Stockholder has been advised that any Person is considering making an
Acquisition Proposal, or (iii) such Stockholder has received any request for
nonpublic information


                                       5
<PAGE>   6

relating to the Company or any Subsidiary, or for access to the properties,
books or records of the Company or any Subsidiary, by any Person. Stockholder
will keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

        SECTION 4.03. Action in Stockholder Capacity Only. Stockholder makes no
agreement or understanding herein as director or officer of the Company.
Stockholder signs solely in his capacity as a recordholder and beneficial owner
of the Shares, and nothing herein shall limit or affect any actions taken in his
capacity as an officer or director of the Company.

        SECTION 4.04. Appraisal Rights. Stockholder agrees not to exercise any
rights (including, without limitation, under Section 262 of the General
Corporation Law of the State of Delaware) to demand appraisal of any Shares
which may arise with respect to the Merger.

        SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors, except David Dominik,
who are affiliated with Stockholder to resign as directors of the Company upon
consummation of the Offer.


                                    ARTICLE 5
                                  MISCELLANEOUS

        SECTION 5.01. Anti-dilution Adjustments. In the event of any change in
the number of Shares owned by Stockholder by reason of any stock dividend,
split-up, recapitalization, merger or other change in the corporate or capital
structure of the Company, the number of Shares and the Per Share Amount shall be
appropriately adjusted, and Buyer shall be entitled to receive any non-cash
distributions made in respect of any Shares purchased hereunder.

        SECTION 5.02.  Entire Agreement.  This Agreement constitutes the entire
agreement between Buyer and Stockholder with respect to the subject matter


                                       6
<PAGE>   7

hereof and supersedes all prior agreements and understandings, both written and
oral, between Buyer and Stockholder with respect to the subject matter hereof.

        SECTION 5.03. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns; provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of the other party hereto, except that Buyer may transfer or
assign its rights and obligations to any affiliate of Buyer.

        SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

        SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

        SECTION 5.06. Amendments; Termination. Any provision of this Agreement
may be amended or waived if, and only if, such amendment or waiver is in writing
and is signed, in the case of an amendment, by each party to this Agreement or
in the case of a waiver, by the party against whom the waiver is to be
effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

        SECTION 5.07.  Expenses.  All costs and expenses incurred in connection
with this Agreement shall be paid by the party incurring such cost or expense.

        SECTION 5.08.  Governing Law.  This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware.

        SECTION 5.09. Counterparts; Effectiveness; Third Party. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective on the date hereof. No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.


                                       7
<PAGE>   8

        SECTION 5.10. Severability. If any term, provision or covenant of this
Agreement is held by a court of competent jurisdiction or other authority to be
invalid, void or unenforceable, the remainder of the terms, provisions and
covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

        SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

        SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

        (b) For purposes of the Agreement, the term "beneficially own" shall
have the meaning set forth in Rule 13d-3 promulgated under the Exchange Act.

        (c) For purposes of this Agreement, the term "MERGER AGREEMENT" includes
the Merger Agreement, as the same may be modified or amended from time to time;
provided that no such amendment or modification amends or modifies the Merger
Agreement in a manner such that the Merger Agreement, as so amended or modified,
is less favorable to Stockholder in any material respect than is the Merger
Agreement in effect on the date hereof.

        (d) For purposes of this Agreement, the term "OFFER" includes the Offer,
as the same may be modified or amended from time to time; provided that no such
amendment or modification amends or modifies the Offer in a manner such that the
Offer, as so amended or modified, is less favorable to Stockholder in any
material respect than is the Offer in effect before such amendment or
modification.


                                       8
<PAGE>   9

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

                                    OSCAR ACQUISITION CORPORATION


                                    By:        /s/ David A Cox
                                        ----------------------------------------
                                        Name: David A Cox
                                        Title: President


                                    INFORMATION PARTNERS CAPITAL
                                    FUND, L.P.
                                    By Information Partners


                                    By:        /s/ David C. Dominik
                                        ----------------------------------------
                                        Title: General Partner


                                       9

<PAGE>   1
                                                                       EXHIBIT 3

                             STOCKHOLDER AGREEMENT

               STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and BCIP Associates
("STOCKHOLDER").

               WHEREAS, in order to induce Buyer and Science Applications
International Corporation, a Delaware corporation ("PARENT"), to enter into an
agreement and plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare
Holdings Corp., a Delaware corporation (the "COMPANY"), Buyer has required that
Stockholder, and Stockholder has agreed to, enter into this Agreement; and

               WHEREAS, the Merger Agreement provides, among other things, upon
the terms and subject to the conditions thereof, for the acquisition by Buyer of
all the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

               WHEREAS, as of the date hereof, Stockholder owns (both
beneficially and of record) 90,332 shares of Company Common Stock and holds
warrants to purchase 4,398 shares of Company Common Stock.

               NOW, THEREFORE, the parties hereto agree as follows:

                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

               SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably
and unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired 

<PAGE>   2

by purchase, exercise of options or otherwise, at any time after the date hereof
and prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

               SECTION 1.02. Voting Agreement. (a) Stockholder hereby
irrevocably and unconditionally agrees to vote or cause to be voted all Shares
that such Stockholder is entitled to vote at the time of any vote of the
stockholders of the Company where such matters arise (i) in favor of the
approval and adoption of the Merger Agreement and in favor of the transactions
contemplated thereby and (ii) against any (A) Acquisition Proposal (other than
the Merger), (B) reorganization, recapitalization, liquidation or winding up of
the Company or any other extraordinary transaction involving the Company, (C)
corporate action the consummation of which would frustrate the purposes, or
prevent or delay the consummation, of the transactions contemplated by the
Merger Agreement or (D) other matter relating to, or in connection with, any of
the matters referred to in clause (A), (B) or (C) above.

                  (b) If any stockholder vote in respect of the Merger Agreement
or any of the transactions contemplated by the Merger Agreement is taken by
written consent, the provisions of this Agreement imposing obligations in
respect of or in connection with any vote of stockholders shall apply mutatis
mutandis to such action by written consent.

               SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably
and unconditionally revokes any and all previous proxies granted with respect to
the Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute

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<PAGE>   3

such further documents as may be required to vest in Buyer the sole power to
vote the Shares during the term of the proxy granted herein.



                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

               Stockholder represents and warrants to Buyer that:

               SECTION 2.01. Corporate Authorization; Binding Effect.
Stockholder has all requisite corporate power and corporate authority to enter
into this Agreement and to consummate the transactions contemplated hereby. The
execution and delivery of this Agreement and the consummation by Stockholder of
the transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

               SECTION 2.02. Non-Contravention; Governmental Authorization. (a)
The execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

                  (b) The execution and delivery of this Agreement by
Stockholder does not, and the performance of this Agreement by Stockholder shall
not, require any consent, approval, authorization or permit of, or filing with
or notification to, any governmental or regulatory authority, domestic or
foreign, except for applicable 

                                       3
<PAGE>   4

requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

               SECTION 2.03. Ownership of Shares. Stockholder is the sole, true,
lawful, beneficial and record owner of (a) 90,332 Shares and (b) warrants to
purchase 4,398 shares of Company Common Stock free and clear of any Lien and any
other limitation or restriction (including any restriction on the right to vote
or otherwise dispose of the Shares). Upon delivery of the Shares and payment of
the purchase price therefor, Buyer will receive good and marketable title to the
Shares free and clear of any pledge, lien, security interest, charge, claim,
equity, option, proxy, voting restriction or encumbrance of any kind. None of
the Shares is subject to any voting trust or other agreement or arrangement with
respect to the voting of such Shares.

               SECTION 2.04. Total Shares. Except for the Shares and warrants
referred to in 2.03, Stockholder does not beneficially own any (i) shares of
capital stock or voting securities of the Company, (ii) securities of the
Company convertible into or exchangeable for shares of capital stock or voting
securities of the Company or (iii) options or other rights to acquire from the
Company any capital stock, voting securities or securities convertible into or
exchangeable for capital stock or voting securities of the Company.

               SECTION 2.05. Finder's Fees. No investment banker, broker, finder
or other intermediary is entitled to a fee or commission from Buyer or the
Company in respect of this Agreement based upon any arrangement or agreement
made by or on behalf of Stockholder.



                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

               Buyer represents and warrants to Stockholder:

               SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by 

                                       4
<PAGE>   5

bankruptcy, insolvency, reorganization, moratorium and other similar laws
relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).



                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

               Stockholder hereby covenants and agrees that:

               SECTION 4.01. No Proxies for, Encumbrances or Transfers of
Shares. Except pursuant to the terms of this Agreement, Stockholder shall not,
without the prior written consent of Buyer, directly or indirectly, (i) grant
any proxies or enter into any voting trust or other agreement or arrangement
with respect to the voting of any Shares or any options, warrants or other
rights to acquire Company Common Stock or (ii) sell, assign, transfer, encumber,
mortgage, or otherwise dispose of, or enter into any contract, option or other
arrangement or understanding with respect to the direct or indirect sale,
assignment, transfer, encumbrance, mortgage or other disposition of, any Shares
or any options, warrants or other rights to acquire Company Common Stock during
the term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

               SECTION 4.02. Other Offers. From the date hereof until the
termination hereof, Stockholder and the officers, directors, employees or other
agents of Stockholder will not, directly or indirectly, (i) take any action to
solicit, initiate or encourage any Acquisition Proposal or (ii) engage in
negotiations with, or disclose any nonpublic information relating to the Company
or any Subsidiary or afford access to the properties, books or records of the
Company or any Subsidiary to, any Person. Stockholder will promptly (and in no
event later than 24 hours after receipt of the relevant Acquisition Proposal)
notify (which notice shall be provided orally and in writing and shall identify
the Person making the relevant Acquisition Proposal and set forth the material
terms thereof) Buyer after (i) such Stockholder has received any Acquisition
Proposal, (ii) such Stockholder has been advised that any Person is considering
making an Acquisition Proposal, or (iii) such Stockholder has received any
request for nonpublic information 


                                       5
<PAGE>   6

relating to the Company or any Subsidiary, or for access to the properties,
books or records of the Company or any Subsidiary, by any Person. Stockholder
will keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

               SECTION 4.03. Action in Stockholder Capacity Only. Stockholder
makes no agreement or understanding herein as director or officer of the
Company. Stockholder signs solely in his capacity as a recordholder and
beneficial owner of the Shares, and nothing herein shall limit or affect any
actions taken in his capacity as an officer or director of the Company.

               SECTION 4.04. Appraisal Rights. Stockholder agrees not to
exercise any rights (including, without limitation, under Section 262 of the
General Corporation Law of the State of Delaware) to demand appraisal of any
Shares which may arise with respect to the Merger.

               SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.



                                    ARTICLE 5
                                  MISCELLANEOUS

               SECTION 5.01. Anti-dilution Adjustments. In the event of any
change in the number of Shares owned by Stockholder by reason of any stock
dividend, split-up, recapitalization, merger or other change in the corporate or
capital structure of the Company, the number of Shares and the Per Share Amount
shall be appropriately adjusted, and Buyer shall be entitled to receive any
non-cash distributions made in respect of any Shares purchased hereunder.

               SECTION 5.02. Entire Agreement. This Agreement constitutes the
entire agreement between Buyer and Stockholder with respect to the subject
matter 


                                       6
<PAGE>   7

hereof and supersedes all prior agreements and understandings, both written and
oral, between Buyer and Stockholder with respect to the subject matter hereof.

               SECTION 5.03. Successors and Assigns. The provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns; provided that no party may assign,
delegate or otherwise transfer any of its rights or obligations under this
Agreement without the consent of the other party hereto, except that Buyer may
transfer or assign its rights and obligations to any affiliate of Buyer.

               SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

               SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

               SECTION 5.06. Amendments; Termination. Any provision of this
Agreement may be amended or waived if, and only if, such amendment or waiver is
in writing and is signed, in the case of an amendment, by each party to this
Agreement or in the case of a waiver, by the party against whom the waiver is to
be effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

               SECTION 5.07.  Expenses.  All costs and expenses incurred in 
connection with this Agreement shall be paid by the party incurring such cost or
expense.

               SECTION 5.08.  Governing Law.  This Agreement shall be construed
in accordance with and governed by the laws of the State of Delaware.

               SECTION 5.09. Counterparts; Effectiveness; Third Party. This
Agreement may be signed in any number of counterparts, each of which shall be an
original, with the same effect as if the signatures thereto and hereto were upon
the same instrument. This Agreement shall become effective on the date hereof.
No provision of this Agreement is intended to confer upon any Person other than
the parties hereto any rights or remedies hereunder.

                                       7
<PAGE>   8

               SECTION 5.10.  Severability.  If any term, provision or covenant
of this Agreement is held by a court of competent jurisdiction or other
authority to be invalid, void or unenforceable, the remainder of the terms,
provisions and covenants of this Agreement shall remain in full force and effect
and shall in no way be affected, impaired or invalidated.

               SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

               SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

               (b) For purposes of the Agreement, the term "beneficially own"
shall have the meaning set forth in Rule 13d-3 promulgated under the Exchange
Act.

               (c) For purposes of this Agreement, the term "MERGER AGREEMENT"
includes the Merger Agreement, as the same may be modified or amended from time
to time; provided that no such amendment or modification amends or modifies the
Merger Agreement in a manner such that the Merger Agreement, as so amended or
modified, is less favorable to Stockholder in any material respect than is the
Merger Agreement in effect on the date hereof.

               (d) For purposes of this Agreement, the term "OFFER" includes the
Offer, as the same may be modified or amended from time to time; provided that
no such amendment or modification amends or modifies the Offer in a manner such
that the Offer, as so amended or modified, is less favorable to Stockholder in
any material respect than is the Offer in effect before such amendment or
modification.



                                       8
<PAGE>   9

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

                                          OSCAR ACQUISITION CORPORATION


                                          By: /s/ David A Cox   
                                              ---------------------------------
                                              Name:    David A Cox
                                              Title:   President

                                          BCIP ASSOCIATES


                                          By: /s/ David C. Dominik
                                              ---------------------------------
                                              Title: General Partner




                                       9

<PAGE>   1
                                                                       EXHIBIT 4

                              STOCKHOLDER AGREEMENT

         STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and BCIP Trust
Associates, L.P. ("STOCKHOLDER").

         WHEREAS, in order to induce Buyer and Science Applications
International Corporation, a Delaware corporation ("PARENT"), to enter into an
agreement and plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare
Holdings Corp., a Delaware corporation (the "COMPANY"), Buyer has required that
Stockholder, and Stockholder has agreed to, enter into this Agreement; and

         WHEREAS, the Merger Agreement provides, among other things, upon the
terms and subject to the conditions thereof, for the acquisition by Buyer of all
the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

         WHEREAS, as of the date hereof, Stockholder owns (both beneficially and
of record) 39,688 shares of Company Common Stock and holds warrants to purchase
6,451 shares of Company Common Stock.

         NOW, THEREFORE, the parties hereto agree as follows:



                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

         SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably and
unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired


<PAGE>   2
by purchase, exercise of options or otherwise, at any time after the date hereof
and prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

         SECTION 1.02. Voting Agreement. (a) Stockholder hereby irrevocably and
unconditionally agrees to vote or cause to be voted all Shares that such
Stockholder is entitled to vote at the time of any vote of the stockholders of
the Company where such matters arise (i) in favor of the approval and adoption
of the Merger Agreement and in favor of the transactions contemplated thereby
and (ii) against any (A) Acquisition Proposal (other than the Merger), (B)
reorganization, recapitalization, liquidation or winding up of the Company or
any other extraordinary transaction involving the Company, (C) corporate action
the consummation of which would frustrate the purposes, or prevent or delay the
consummation, of the transactions contemplated by the Merger Agreement or (D)
other matter relating to, or in connection with, any of the matters referred to
in clause (A), (B) or (C) above.

         (b) If any stockholder vote in respect of the Merger Agreement or any
of the transactions contemplated by the Merger Agreement is taken by written
consent, the provisions of this Agreement imposing obligations in respect of or
in connection with any vote of stockholders shall apply mutatis mutandis to such
action by written consent.

         SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably and
unconditionally revokes any and all previous proxies granted with respect to the
Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute


                                       2
<PAGE>   3
such further documents as may be required to vest in Buyer the sole power to
vote the Shares during the term of the proxy granted herein.


                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

         Stockholder represents and warrants to Buyer that:

         SECTION 2.01. Corporate Authorization; Binding Effect. Stockholder has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Stockholder of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

         SECTION 2.02. Non-Contravention; Governmental Authorization. (a) The
execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

          (b) The execution and delivery of this Agreement by Stockholder does
not, and the performance of this Agreement by Stockholder shall not, require any
consent, approval, authorization or permit of, or filing with or notification
to, any governmental or regulatory authority, domestic or foreign, except for
applicable


                                       3
<PAGE>   4
requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

         SECTION 2.03. Ownership of Shares. Stockholder is the sole, true,
lawful, beneficial and record owner of (a) 39,688 Shares and (b) warrants to
purchase 6,451 shares of Company Common Stock free and clear of any Lien and any
other limitation or restriction (including any restriction on the right to vote
or otherwise dispose of the Shares). Upon delivery of the Shares and payment of
the purchase price therefor, Buyer will receive good and marketable title to the
Shares free and clear of any pledge, lien, security interest, charge, claim,
equity, option, proxy, voting restriction or encumbrance of any kind. None of
the Shares is subject to any voting trust or other agreement or arrangement with
respect to the voting of such Shares.

         SECTION 2.04. Total Shares. Except for the Shares and warrants referred
to in 2.03, Stockholder does not beneficially own any (i) shares of capital
stock or voting securities of the Company, (ii) securities of the Company
convertible into or exchangeable for shares of capital stock or voting
securities of the Company or (iii) options or other rights to acquire from the
Company any capital stock, voting securities or securities convertible into or
exchangeable for capital stock or voting securities of the Company.

         SECTION 2.05. Finder's Fees. No investment banker, broker, finder or
other intermediary is entitled to a fee or commission from Buyer or the Company
in respect of this Agreement based upon any arrangement or agreement made by or
on behalf of Stockholder.


                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer represents and warrants to Stockholder:

         SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has all
requisite corporate power and corporate authority to enter into this Agreement
and to consummate the transactions contemplated hereby. The execution and
delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by


                                       4
<PAGE>   5
bankruptcy, insolvency, reorganization, moratorium and other similar laws
relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).


                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

         Stockholder hereby covenants and agrees that:

         SECTION 4.01. No Proxies for, Encumbrances or Transfers of Shares.
Except pursuant to the terms of this Agreement, Stockholder shall not, without
the prior written consent of Buyer, directly or indirectly, (i) grant any
proxies or enter into any voting trust or other agreement or arrangement with
respect to the voting of any Shares or any options, warrants or other rights to
acquire Company Common Stock or (ii) sell, assign, transfer, encumber, mortgage,
or otherwise dispose of, or enter into any contract, option or other arrangement
or understanding with respect to the direct or indirect sale, assignment,
transfer, encumbrance, mortgage or other disposition of, any Shares or any
options, warrants or other rights to acquire Company Common Stock during the
term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

         SECTION 4.02. Other Offers. From the date hereof until the termination
hereof, Stockholder and the officers, directors, employees or other agents of
Stockholder will not, directly or indirectly, (i) take any action to solicit,
initiate or encourage any Acquisition Proposal or (ii) engage in negotiations
with, or disclose any nonpublic information relating to the Company or any
Subsidiary or afford access to the properties, books or records of the Company
or any Subsidiary to, any Person. Stockholder will promptly (and in no event
later than 24 hours after receipt of the relevant Acquisition Proposal) notify
(which notice shall be provided orally and in writing and shall identify the
Person making the relevant Acquisition Proposal and set forth the material terms
thereof) Buyer after (i) such Stockholder has received any Acquisition Proposal,
(ii) such Stockholder has been advised that any Person is considering making an
Acquisition Proposal, or (iii) such Stockholder has received any request for
nonpublic information


                                       5
<PAGE>   6
relating to the Company or any Subsidiary, or for access to the properties,
books or records of the Company or any Subsidiary, by any Person. Stockholder
will keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

         SECTION 4.03. Action in Stockholder Capacity Only. Stockholder makes no
agreement or understanding herein as director or officer of the Company.
Stockholder signs solely in his capacity as a recordholder and beneficial owner
of the Shares, and nothing herein shall limit or affect any actions taken in his
capacity as an officer or director of the Company.

         SECTION 4.04. Appraisal Rights. Stockholder agrees not to exercise any
rights (including, without limitation, under Section 262 of the General
Corporation Law of the State of Delaware) to demand appraisal of any Shares
which may arise with respect to the Merger.

         SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.


                                    ARTICLE 5
                                  MISCELLANEOUS

         SECTION 5.01. Anti-dilution Adjustments. In the event of any change in
the number of Shares owned by Stockholder by reason of any stock dividend,
split-up, recapitalization, merger or other change in the corporate or capital
structure of the Company, the number of Shares and the Per Share Amount shall be
appropriately adjusted, and Buyer shall be entitled to receive any non-cash
distributions made in respect of any Shares purchased hereunder.

         SECTION 5.02.  Entire Agreement.  This Agreement constitutes the entire
agreement between Buyer and Stockholder with respect to the subject matter


                                       6
<PAGE>   7
hereof and supersedes all prior agreements and understandings, both written and
oral, between Buyer and Stockholder with respect to the subject matter hereof.

         SECTION 5.03. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns; provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of the other party hereto, except that Buyer may transfer or
assign its rights and obligations to any affiliate of Buyer.

         SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

         SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

         SECTION 5.06. Amendments; Termination. Any provision of this Agreement
may be amended or waived if, and only if, such amendment or waiver is in writing
and is signed, in the case of an amendment, by each party to this Agreement or
in the case of a waiver, by the party against whom the waiver is to be
effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

         SECTION 5.07.  Expenses.  All costs and expenses incurred in connection
with this Agreement shall be paid by the party incurring such cost or expense.

         SECTION 5.08.  Governing Law.  This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware.

         SECTION 5.09. Counterparts; Effectiveness; Third Party. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective on the date hereof. No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.


                                       7
<PAGE>   8
         SECTION 5.10. Severability. If any term, provision or covenant of this
Agreement is held by a court of competent jurisdiction or other authority to be
invalid, void or unenforceable, the remainder of the terms, provisions and
covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

         SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

         SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

         (b) For purposes of the Agreement, the term "beneficially own" shall
have the meaning set forth in Rule 13d-3 promulgated under the Exchange Act.

         (c) For purposes of this Agreement, the term "MERGER AGREEMENT"
includes the Merger Agreement, as the same may be modified or amended from time
to time; provided that no such amendment or modification amends or modifies the
Merger Agreement in a manner such that the Merger Agreement, as so amended or
modified, is less favorable to Stockholder in any material respect than is the
Merger Agreement in effect on the date hereof.

         (d) For purposes of this Agreement, the term "OFFER" includes the
Offer, as the same may be modified or amended from time to time; provided that
no such amendment or modification amends or modifies the Offer in a manner such
that the Offer, as so amended or modified, is less favorable to Stockholder in
any material respect than is the Offer in effect before such amendment or
modification.


                                       8
<PAGE>   9
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                       OSCAR ACQUISITION CORPORATION


                                       By:       /s/ David A Cox
                                           -------------------------------------
                                           Name:    David A Cox
                                           Title:   President

                                       BCIP TRUST ASSOCIATES, L.P.


                                       By:      /s/ David C. Dominik
                                           -------------------------------------
                                           Title: General Partner

                                       9

<PAGE>   1
                                                                      EXHIBIT 5

                              STOCKHOLDER AGREEMENT

         STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and Sutter Hill
Ventures ("STOCKHOLDER").

         WHEREAS, in order to induce Buyer and Science Applications
International Corporation, a Delaware corporation ("PARENT"), to enter into an
agreement and plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare
Holdings Corp., a Delaware corporation (the "COMPANY"), Buyer has required that
Stockholder, and Stockholder has agreed to, enter into this Agreement; and

         WHEREAS, the Merger Agreement provides, among other things, upon the
terms and subject to the conditions thereof, for the acquisition by Buyer of all
the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

         WHEREAS, as of the date hereof, Stockholder owns (both beneficially and
of record) 819,216 shares of Company Common Stock.

         NOW, THEREFORE, the parties hereto agree as follows:


                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

         SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably and
unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired by purchase, exercise of options or otherwise, at any time
after the date hereof and


<PAGE>   2
prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

         SECTION 1.02. Voting Agreement. (a) Stockholder hereby irrevocably and
unconditionally agrees to vote or cause to be voted all Shares that such
Stockholder is entitled to vote at the time of any vote of the stockholders of
the Company where such matters arise (i) in favor of the approval and adoption
of the Merger Agreement and in favor of the transactions contemplated thereby
and (ii) against any (A) Acquisition Proposal (other than the Merger), (B)
reorganization, recapitalization, liquidation or winding up of the Company or
any other extraordinary transaction involving the Company, (C) corporate action
the consummation of which would frustrate the purposes, or prevent or delay the
consummation, of the transactions contemplated by the Merger Agreement or (D)
other matter relating to, or in connection with, any of the matters referred to
in clause (A), (B) or (C) above.

         (b) If any stockholder vote in respect of the Merger Agreement or any
of the transactions contemplated by the Merger Agreement is taken by written
consent, the provisions of this Agreement imposing obligations in respect of or
in connection with any vote of stockholders shall apply mutatis mutandis to such
action by written consent.

         SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably and
unconditionally revokes any and all previous proxies granted with respect to the
Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute


                                       2
<PAGE>   3
such further documents as may be required to vest in Buyer the sole power to
vote the Shares during the term of the proxy granted herein.


                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

         Stockholder represents and warrants to Buyer that:

         SECTION 2.01. Corporate Authorization; Binding Effect. Stockholder has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Stockholder of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

         SECTION 2.02. Non-Contravention; Governmental Authorization. (a) The
execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

          (b) The execution and delivery of this Agreement by Stockholder does
not, and the performance of this Agreement by Stockholder shall not, require any
consent, approval, authorization or permit of, or filing with or notification
to, any governmental or regulatory authority, domestic or foreign, except for
applicable


                                       3
<PAGE>   4
requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

         SECTION 2.03. Ownership of Shares. Stockholder is the sole, true,
lawful, beneficial and record owner of 819,216 Shares free and clear of any Lien
and any other limitation or restriction (including any restriction on the right
to vote or otherwise dispose of the Shares). Upon delivery of the Shares and
payment of the purchase price therefor, Buyer will receive good and marketable
title to the Shares free and clear of any pledge, lien, security interest,
charge, claim, equity, option, proxy, voting restriction or encumbrance of any
kind. None of the Shares is subject to any voting trust or other agreement or
arrangement with respect to the voting of such Shares.

         SECTION 2.04. Total Shares. Except for the Shares referred to in 2.03,
Stockholder does not beneficially own any (i) shares of capital stock or voting
securities of the Company, (ii) securities of the Company convertible into or
exchangeable for shares of capital stock or voting securities of the Company or
(iii) options or other rights to acquire from the Company any capital stock,
voting securities or securities convertible into or exchangeable for capital
stock or voting securities of the Company.

         SECTION 2.05. Finder's Fees. No investment banker, broker, finder or
other intermediary is entitled to a fee or commission from Buyer or the Company
in respect of this Agreement based upon any arrangement or agreement made by or
on behalf of Stockholder.


                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer represents and warrants to Stockholder:

         SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has all
requisite corporate power and corporate authority to enter into this Agreement
and to consummate the transactions contemplated hereby. The execution and
delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by bankruptcy, insolvency, reorganization, moratorium and other similar
laws


                                       4
<PAGE>   5
relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).


                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

         Stockholder hereby covenants and agrees that:

         SECTION 4.01. No Proxies for, Encumbrances or Transfers of Shares.
Except pursuant to the terms of this Agreement, Stockholder shall not, without
the prior written consent of Buyer, directly or indirectly, (i) grant any
proxies or enter into any voting trust or other agreement or arrangement with
respect to the voting of any Shares or any options, warrants or other rights to
acquire Company Common Stock or (ii) sell, assign, transfer, encumber, mortgage,
or otherwise dispose of, or enter into any contract, option or other arrangement
or understanding with respect to the direct or indirect sale, assignment,
transfer, encumbrance, mortgage or other disposition of, any Shares or any
options, warrants or other rights to acquire Company Common Stock during the
term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

         SECTION 4.02. Other Offers. From the date hereof until the termination
hereof, Stockholder and the officers, directors, employees or other agents of
Stockholder will not, directly or indirectly, (i) take any action to solicit,
initiate or encourage any Acquisition Proposal or (ii) engage in negotiations
with, or disclose any nonpublic information relating to the Company or any
Subsidiary or afford access to the properties, books or records of the Company
or any Subsidiary to, any Person. Stockholder will promptly (and in no event
later than 24 hours after receipt of the relevant Acquisition Proposal) notify
(which notice shall be provided orally and in writing and shall identify the
Person making the relevant Acquisition Proposal and set forth the material terms
thereof) Buyer after (i) such Stockholder has received any Acquisition Proposal,
(ii) such Stockholder has been advised that any Person is considering making an
Acquisition Proposal, or (iii) such Stockholder has received any request for
nonpublic information relating to the Company or any Subsidiary, or for access
to the properties, books


                                       5
<PAGE>   6
or records of the Company or any Subsidiary, by any Person. Stockholder will
keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

         SECTION 4.03. Action in Stockholder Capacity Only. Stockholder makes no
agreement or understanding herein as director or officer of the Company.
Stockholder signs solely in his capacity as a recordholder and beneficial owner
of the Shares, and nothing herein shall limit or affect any actions taken in his
capacity as an officer or director of the Company.

         SECTION 4.04. Appraisal Rights. Stockholder agrees not to exercise any
rights (including, without limitation, under Section 262 of the General
Corporation Law of the State of Delaware) to demand appraisal of any Shares
which may arise with respect to the Merger.

         SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.


                                    ARTICLE 5
                                  MISCELLANEOUS

         SECTION 5.01. Anti-dilution Adjustments. In the event of any change in
the number of Shares owned by Stockholder by reason of any stock dividend,
split-up, recapitalization, merger or other change in the corporate or capital
structure of the Company, the number of Shares and the Per Share Amount shall be
appropriately adjusted, and Buyer shall be entitled to receive any non-cash
distributions made in respect of any Shares purchased hereunder.

         SECTION 5.02. Entire Agreement. This Agreement constitutes the entire
agreement between Buyer and Stockholder with respect to the subject matter
hereof and supersedes all prior agreements and understandings, both written and
oral, between Buyer and Stockholder with respect to the subject matter hereof.


                                       6
<PAGE>   7
         SECTION 5.03. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns; provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of the other party hereto, except that Buyer may transfer or
assign its rights and obligations to any affiliate of Buyer.

         SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

         SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

         SECTION 5.06. Amendments; Termination. Any provision of this Agreement
may be amended or waived if, and only if, such amendment or waiver is in writing
and is signed, in the case of an amendment, by each party to this Agreement or
in the case of a waiver, by the party against whom the waiver is to be
effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

         SECTION 5.07.  Expenses.  All costs and expenses incurred in connection
with this Agreement shall be paid by the party incurring such cost or expense.

         SECTION 5.08.  Governing Law.  This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware.

         SECTION 5.09. Counterparts; Effectiveness; Third Party. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective on the date hereof. No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.

         SECTION 5.10.  Severability.  If any term, provision or covenant of 
this Agreement is held by a court of competent jurisdiction or other authority
to be invalid, void or unenforceable, the remainder of the terms, provisions and


                                       7
<PAGE>   8
covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

         SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

         SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

         (b) For purposes of the Agreement, the term "beneficially own" shall
have the meaning set forth in Rule 13d-3 promulgated under the Exchange Act.

         (c) For purposes of this Agreement, the term "MERGER AGREEMENT"
includes the Merger Agreement, as the same may be modified or amended from time
to time; provided that no such amendment or modification amends or modifies the
Merger Agreement in a manner such that the Merger Agreement, as so amended or
modified, is less favorable to Stockholder in any material respect than is the
Merger Agreement in effect on the date hereof.

         (d) For purposes of this Agreement, the term "OFFER" includes the
Offer, as the same may be modified or amended from time to time; provided that
no such amendment or modification amends or modifies the Offer in a manner such
that the Offer, as so amended or modified, is less favorable to Stockholder in
any material respect than is the Offer in effect before such amendment or
modification.


                                       8
<PAGE>   9
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                       OSCAR ACQUISITION CORPORATION


                                       By:       /s/  David A. Cox
                                           -------------------------------------
                                           Name:    David A. Cox
                                           Title:   President

                                       SUTTER HILL VENTURES, A California
                                       Limited Partnership


                                       By:   /s/  William H. Younger, Jr.
                                           -------------------------------------
                                           Name: William H. Younger, Jr.
                                           Title: Managing Director of the
                                                  General Partner

                                       9

<PAGE>   1
                                                                       EXHIBIT 6

                              STOCKHOLDER AGREEMENT

               STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and InterWest
Partners V, L.P. ("STOCKHOLDER").

               WHEREAS, in order to induce Buyer and Science Applications
International Corporation, a Delaware corporation ("PARENT"), to enter into an
agreement and plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare
Holdings Corp., a Delaware corporation (the "COMPANY"), Buyer has required that
Stockholder, and Stockholder has agreed to, enter into this Agreement; and

               WHEREAS, the Merger Agreement provides, among other things, upon
the terms and subject to the conditions thereof, for the acquisition by Buyer of
all the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

               WHEREAS, as of the date hereof, Stockholder owns (both
beneficially and of record) 1,122,882 shares of Company Common Stock.

               NOW, THEREFORE, the parties hereto agree as follows:



                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

               SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably
and unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired by purchase, exercise of options or otherwise, at any time
after the date hereof and 

<PAGE>   2

prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

               SECTION 1.02. Voting Agreement. (a) Stockholder hereby
irrevocably and unconditionally agrees to vote or cause to be voted all Shares
that such Stockholder is entitled to vote at the time of any vote of the
stockholders of the Company where such matters arise (i) in favor of the
approval and adoption of the Merger Agreement and in favor of the transactions
contemplated thereby and (ii) against any (A) Acquisition Proposal (other than
the Merger), (B) reorganization, recapitalization, liquidation or winding up of
the Company or any other extraordinary transaction involving the Company, (C)
corporate action the consummation of which would frustrate the purposes, or
prevent or delay the consummation, of the transactions contemplated by the
Merger Agreement or (D) other matter relating to, or in connection with, any of
the matters referred to in clause (A), (B) or (C) above.

                  (b) If any stockholder vote in respect of the Merger Agreement
or any of the transactions contemplated by the Merger Agreement is taken by
written consent, the provisions of this Agreement imposing obligations in
respect of or in connection with any vote of stockholders shall apply mutatis
mutandis to such action by written consent.

               SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably
and unconditionally revokes any and all previous proxies granted with respect to
the Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute 

                                       2
<PAGE>   3

such further documents as may be required to vest in Buyer the sole
power to vote the Shares during the term of the proxy granted herein.



                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

               Stockholder represents and warrants to Buyer that:

               SECTION 2.01. Corporate Authorization; Binding Effect.
Stockholder has all requisite corporate power and corporate authority to enter
into this Agreement and to consummate the transactions contemplated hereby. The
execution and delivery of this Agreement and the consummation by Stockholder of
the transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

               SECTION 2.02. Non-Contravention; Governmental Authorization. (a)
The execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

                  (b) The execution and delivery of this Agreement by
Stockholder does not, and the performance of this Agreement by Stockholder shall
not, require any consent, approval, authorization or permit of, or filing with
or notification to, any governmental or regulatory authority, domestic or
foreign, except for applicable 

                                       3
<PAGE>   4

requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

               SECTION 2.03.  Ownership of Shares.  Stockholder is the sole, 
true, lawful, beneficial and record owner of 1,122,882 Shares free and clear of
any Lien and any other limitation or restriction (including any restriction on
the right to vote or otherwise dispose of the Shares). Upon delivery of the
Shares and payment of the purchase price therefor, Buyer will receive good and
marketable title to the Shares free and clear of any pledge, lien, security
interest, charge, claim, equity, option, proxy, voting restriction or
encumbrance of any kind. None of the Shares is subject to any voting trust or
other agreement or arrangement with respect to the voting of such Shares.

               SECTION 2.04. Total Shares. Except for the Shares referred to in
2.03, Stockholder does not beneficially own any (i) shares of capital stock or
voting securities of the Company, (ii) securities of the Company convertible
into or exchangeable for shares of capital stock or voting securities of the
Company or (iii) options or other rights to acquire from the Company any capital
stock, voting securities or securities convertible into or exchangeable for
capital stock or voting securities of the Company.

               SECTION 2.05. Finder's Fees. No investment banker, broker, finder
or other intermediary is entitled to a fee or commission from Buyer or the
Company in respect of this Agreement based upon any arrangement or agreement
made by or on behalf of Stockholder.



                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

               Buyer represents and warrants to Stockholder:

               SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by bankruptcy, insolvency, reorganization, moratorium and other similar
laws 

                                       4
<PAGE>   5

relating to or affecting creditors generally and by general equity
principles (regardless of whether such enforceability is considered in a
proceeding in equity or at law).



                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

               Stockholder hereby covenants and agrees that:

               SECTION 4.01. No Proxies for, Encumbrances or Transfers of
Shares. Except pursuant to the terms of this Agreement, Stockholder shall not,
without the prior written consent of Buyer, directly or indirectly, (i) grant
any proxies or enter into any voting trust or other agreement or arrangement
with respect to the voting of any Shares or any options, warrants or other
rights to acquire Company Common Stock or (ii) sell, assign, transfer, encumber,
mortgage, or otherwise dispose of, or enter into any contract, option or other
arrangement or understanding with respect to the direct or indirect sale,
assignment, transfer, encumbrance, mortgage or other disposition of, any Shares
or any options, warrants or other rights to acquire Company Common Stock during
the term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

               SECTION 4.02. Other Offers. From the date hereof until the
termination hereof, Stockholder and the officers, directors, employees or other
agents of Stockholder will not, directly or indirectly, (i) take any action to
solicit, initiate or encourage any Acquisition Proposal or (ii) engage in
negotiations with, or disclose any nonpublic information relating to the Company
or any Subsidiary or afford access to the properties, books or records of the
Company or any Subsidiary to, any Person. Stockholder will promptly (and in no
event later than 24 hours after receipt of the relevant Acquisition Proposal)
notify (which notice shall be provided orally and in writing and shall identify
the Person making the relevant Acquisition Proposal and set forth the material
terms thereof) Buyer after (i) such Stockholder has received any Acquisition
Proposal, (ii) such Stockholder has been advised that any Person is considering
making an Acquisition Proposal, or (iii) such Stockholder has received any
request for nonpublic information relating to the Company or any Subsidiary, or
for access to the properties, books 

                                       5
<PAGE>   6

or records of the Company or any Subsidiary, by any Person. Stockholder will
keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

               SECTION 4.03. Action in Stockholder Capacity Only. Stockholder
makes no agreement or understanding herein as director or officer of the
Company. Stockholder signs solely in his capacity as a recordholder and
beneficial owner of the Shares, and nothing herein shall limit or affect any
actions taken in his capacity as an officer or director of the Company.

               SECTION 4.04. Appraisal Rights. Stockholder agrees not to
exercise any rights (including, without limitation, under Section 262 of the
General Corporation Law of the State of Delaware) to demand appraisal of any
Shares which may arise with respect to the Merger.

               SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.



                                    ARTICLE 5
                                  MISCELLANEOUS

               SECTION 5.01. Anti-dilution Adjustments. In the event of any
change in the number of Shares owned by Stockholder by reason of any stock
dividend, split-up, recapitalization, merger or other change in the corporate or
capital structure of the Company, the number of Shares and the Per Share Amount
shall be appropriately adjusted, and Buyer shall be entitled to receive any
non-cash distributions made in respect of any Shares purchased hereunder.

               SECTION 5.02. Entire Agreement. This Agreement constitutes the
entire agreement between Buyer and Stockholder with respect to the subject
matter hereof and supersedes all prior agreements and understandings, both
written and oral, between Buyer and Stockholder with respect to the subject
matter hereof.

                                       6
<PAGE>   7

               SECTION 5.03. Successors and Assigns. The provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns; provided that no party may assign,
delegate or otherwise transfer any of its rights or obligations under this
Agreement without the consent of the other party hereto, except that Buyer may
transfer or assign its rights and obligations to any affiliate of Buyer.

               SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

               SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

               SECTION 5.06. Amendments; Termination. Any provision of this
Agreement may be amended or waived if, and only if, such amendment or waiver is
in writing and is signed, in the case of an amendment, by each party to this
Agreement or in the case of a waiver, by the party against whom the waiver is to
be effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

               SECTION 5.07.  Expenses.  All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such cost or
expense.

               SECTION 5.08.  Governing Law.  This Agreement shall be construed
in accordance with and governed by the laws of the State of Delaware.

               SECTION 5.09. Counterparts; Effectiveness; Third Party. This
Agreement may be signed in any number of counterparts, each of which shall be an
original, with the same effect as if the signatures thereto and hereto were upon
the same instrument. This Agreement shall become effective on the date hereof.
No provision of this Agreement is intended to confer upon any Person other than
the parties hereto any rights or remedies hereunder.

               SECTION 5.10. Severability. If any term, provision or covenant of
this Agreement is held by a court of competent jurisdiction or other authority
to be invalid, void or unenforceable, the remainder of the terms, provisions and

                                       7
<PAGE>   8

covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

               SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

               SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

               (b) For purposes of the Agreement, the term "beneficially own"
shall have the meaning set forth in Rule 13d-3 promulgated under the Exchange
Act.

               (c) For purposes of this Agreement, the term "MERGER AGREEMENT"
includes the Merger Agreement, as the same may be modified or amended from time
to time; provided that no such amendment or modification amends or modifies the
Merger Agreement in a manner such that the Merger Agreement, as so amended or
modified, is less favorable to Stockholder in any material respect than is the
Merger Agreement in effect on the date hereof.

               (d) For purposes of this Agreement, the term "OFFER" includes the
Offer, as the same may be modified or amended from time to time; provided that
no such amendment or modification amends or modifies the Offer in a manner such
that the Offer, as so amended or modified, is less favorable to Stockholder in
any material respect than is the Offer in effect before such amendment or
modification.


                                       8
<PAGE>   9

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

                                       OSCAR ACQUISITION CORPORATION


                                       By: /s/ David A. Cox
                                           ------------------------------------
                                           Name:    David A. Cox
                                           Title:   President

                                       INTERWEST PARTNERS V, L.P.
                                       By:   Interwest Management Partners V,
                                             L.P., General Partner


                                       By: /s/ Al Crites
                                           ------------------------------------
                                           General Partner



                                       9

<PAGE>   1
                                                                       EXHIBIT 7


                              STOCKHOLDER AGREEMENT

         STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("Buyer"), and IMS Health
Incorporated ("Stockholder").

         WHEREAS, in order to induce Buyer and Science Applications
International Corporation, a Delaware corporation ("Parent"), to enter into an
agreement and plan of merger (the "Merger Agreement") with Oacis Healthcare
Holdings Corp., a Delaware corporation (the "Company"), Buyer has required that
Stockholder, and Stockholder has agreed to, enter into this Agreement; and

         WHEREAS, the Merger Agreement provides, among other things, upon the
terms and subject to the conditions thereof, for the acquisition by Buyer of all
the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "Company Common Stock") through (a) a tender offer (the "Offer")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "Per Share Amount") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "Merger") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

         WHEREAS, as of the date hereof, Stockholder owns (both beneficially and
of record) 1,110,661 shares of Company Common Stock.

         NOW, THEREFORE, the parties hereto agree as follows:


                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

         Section 1.01. Agreement to Tender. Stockholder hereby irrevocably and
unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired by purchase, exercise of options or otherwise, at any time
after the date hereof and


<PAGE>   2
prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "Shares"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

         Section 1.02. Voting Agreement. (a) Stockholder hereby irrevocably and
unconditionally agrees to vote or cause to be voted all Shares that such
Stockholder is entitled to vote at the time of any vote of the stockholders of
the Company where such matters arise (i) in favor of the approval and adoption
of the Merger Agreement and in favor of the transactions contemplated thereby
and (ii) against any (A) Acquisition Proposal (other than the Merger), (B)
reorganization, recapitalization, liquidation or winding up of the Company or
any other extraordinary transaction involving the Company, (C) corporate action
the consummation of which would frustrate the purposes, or prevent or delay the
consummation, of the transactions contemplated by the Merger Agreement or (D)
other matter relating to, or in connection with, any of the matters referred to
in clause (A), (B) or (C) above.

          (b) If any stockholder vote in respect of the Merger Agreement or any
of the transactions contemplated by the Merger Agreement is taken by written
consent, the provisions of this Agreement imposing obligations in respect of or
in connection with any vote of stockholders shall apply mutatis mutandis to such
action by written consent.

         Section 1.03. Irrevocable Proxy. Stockholder hereby irrevocably and
unconditionally revokes any and all previous proxies granted with respect to the
Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute


                                       2
<PAGE>   3
such further documents as may be required to vest in Buyer the sole power to
vote the Shares during the term of the proxy granted herein.


                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

         Stockholder represents and warrants to Buyer that:

         Section 2.01. Corporate Authorization; Binding Effect. Stockholder has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Stockholder of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

         Section 2.02. Non-Contravention; Governmental Authorization. (a) The
execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

          (b) The execution and delivery of this Agreement by Stockholder does
not, and the performance of this Agreement by Stockholder shall not, require any
consent, approval, authorization or permit of, or filing with or notification
to, any governmental or regulatory authority, domestic or foreign, except for
applicable


                                       3
<PAGE>   4
requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

         Section 2.03. Ownership of Shares. Stockholder is the sole, true,
lawful, beneficial and record owner of 1,110,661 Shares free and clear of any
Lien and any other limitation or restriction (including any restriction on the
right to vote or otherwise dispose of the Shares). Upon delivery of the Shares
and payment of the purchase price therefor, Buyer will receive good and
marketable title to the Shares free and clear of any pledge, lien, security
interest, charge, claim, equity, option, proxy, voting restriction or
encumbrance of any kind. None of the Shares is subject to any voting trust or
other agreement or arrangement with respect to the voting of such Shares.

         Section 2.04. Total Shares. Except for the Shares referred to in 2.03,
Stockholder does not beneficially own any (i) shares of capital stock or voting
securities of the Company, (ii) securities of the Company convertible into or
exchangeable for shares of capital stock or voting securities of the Company or
(iii) options or other rights to acquire from the Company any capital stock,
voting securities or securities convertible into or exchangeable for capital
stock or voting securities of the Company.

         Section 2.05. Finder's Fees. No investment banker, broker, finder or
other intermediary is entitled to a fee or commission from Buyer or the Company
in respect of this Agreement based upon any arrangement or agreement made by or
on behalf of Stockholder.


                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer represents and warrants to Stockholder:

         Section 3.01. Corporate Authorization; Binding Effect. Buyer has all
requisite corporate power and corporate authority to enter into this Agreement
and to consummate the transactions contemplated hereby. The execution and
delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by bankruptcy, insolvency, reorganization, moratorium and other similar
laws


                                       4
<PAGE>   5
relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).


                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

         Stockholder hereby covenants and agrees that:

         Section 4.01. No Proxies for, Encumbrances or Transfers of Shares.
Except pursuant to the terms of this Agreement, Stockholder shall not, without
the prior written consent of Buyer, directly or indirectly, (i) grant any
proxies or enter into any voting trust or other agreement or arrangement with
respect to the voting of any Shares or any options, warrants or other rights to
acquire Company Common Stock or (ii) sell, assign, transfer, encumber, mortgage,
or otherwise dispose of, or enter into any contract, option or other arrangement
or understanding with respect to the direct or indirect sale, assignment,
transfer, encumbrance, mortgage or other disposition of, any Shares or any
options, warrants or other rights to acquire Company Common Stock during the
term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

         Section 4.02. Other Offers. From the date hereof until the termination
hereof, Stockholder and the officers, directors, employees or other agents of
Stockholder will not, directly or indirectly, (i) take any action to solicit,
initiate or encourage any Acquisition Proposal or (ii) engage in negotiations
with, or disclose any nonpublic information relating to the Company or any
Subsidiary or afford access to the properties, books or records of the Company
or any Subsidiary to, any Person. Stockholder will promptly (and in no event
later than 24 hours after receipt of the relevant Acquisition Proposal) notify
(which notice shall be provided orally and in writing and shall identify the
Person making the relevant Acquisition Proposal and set forth the material terms
thereof) Buyer after (i) such Stockholder has received any Acquisition Proposal,
(ii) such Stockholder has been advised that any Person is considering making an
Acquisition Proposal, or (iii) such Stockholder has received any request for
nonpublic information relating to the Company or any Subsidiary, or for access
to the properties, books


                                       5
<PAGE>   6
or records of the Company or any Subsidiary, by any Person. Stockholder will
keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

         Section 4.03. Action in Stockholder Capacity Only. Stockholder makes no
agreement or understanding herein as director or officer of the Company.
Stockholder signs solely in his capacity as a recordholder and beneficial owner
of the Shares, and nothing herein shall limit or affect any actions taken in his
capacity as an officer or director of the Company.

         Section 4.04. Appraisal Rights. Stockholder agrees not to exercise any
rights (including, without limitation, under Section 262 of the General
Corporation Law of the State of Delaware) to demand appraisal of any Shares
which may arise with respect to the Merger.

         Section 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.


                                    ARTICLE 5
                                  MISCELLANEOUS

         Section 5.01. Anti-dilution Adjustments. In the event of any change in
the number of Shares owned by Stockholder by reason of any stock dividend,
split-up, recapitalization, merger or other change in the corporate or capital
structure of the Company, the number of Shares and the Per Share Amount shall be
appropriately adjusted, and Buyer shall be entitled to receive any non-cash
distributions made in respect of any Shares purchased hereunder.

         Section 5.02. Entire Agreement. This Agreement constitutes the entire
agreement between Buyer and Stockholder with respect to the subject matter
hereof and supersedes all prior agreements and understandings, both written and
oral, between Buyer and Stockholder with respect to the subject matter hereof.


                                       6
<PAGE>   7
         Section 5.03. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns; provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of the other party hereto, except that Buyer may transfer or
assign its rights and obligations to any affiliate of Buyer.

         Section 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

         Section 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

         Section 5.06. Amendments; Termination. Any provision of this Agreement
may be amended or waived if, and only if, such amendment or waiver is in writing
and is signed, in the case of an amendment, by each party to this Agreement or
in the case of a waiver, by the party against whom the waiver is to be
effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

         Section 5.07.  Expenses.  All costs and expenses incurred in connection
with this Agreement shall be paid by the party incurring such cost or expense.

         Section 5.08.  Governing Law.  This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware.

         Section 5.09. Counterparts; Effectiveness; Third Party. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective on the date hereof. No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.

         Section 5.10.  Severability.  If any term, provision or covenant of
this Agreement is held by a court of competent jurisdiction or other authority
to be invalid, void or unenforceable, the remainder of the terms, provisions and


                                       7
<PAGE>   8
covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

         Section 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

         Section 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

         (b) For purposes of the Agreement, the term "beneficially own" shall
have the meaning set forth in Rule 13d-3 promulgated under the Exchange Act.

         (c) For purposes of this Agreement, the term "Merger Agreement"
includes the Merger Agreement, as the same may be modified or amended from time
to time; provided that no such amendment or modification amends or modifies the
Merger Agreement in a manner such that the Merger Agreement, as so amended or
modified, is less favorable to Stockholder in any material respect than is the
Merger Agreement in effect on the date hereof.

         (d) For purposes of this Agreement, the term "Offer" includes the
Offer, as the same may be modified or amended from time to time; provided that
no such amendment or modification amends or modifies the Offer in a manner such
that the Offer, as so amended or modified, is less favorable to Stockholder in
any material respect than is the Offer in effect before such amendment or
modification.


                                       8
<PAGE>   9
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.


                                       OSCAR ACQUISITION CORPORATION


                                       By: /s/  David A. Cox
                                           -------------------------------------
                                           Name:    David A. Cox
                                           Title:   President



                                       IMS Health Incorporated


                                       By:    /s/  Kenneth Siegel
                                           -------------------------------------
                                       Name:  Kenneth Siegel
                                       Title: Senior Vice President




                                       9

<PAGE>   1
                                                                       EXHIBIT 8


                              STOCKHOLDER AGREEMENT

               STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and Sequoia
Capital Growth Fund ("STOCKHOLDER").

               WHEREAS, in order to induce Buyer and Science Applications
International Corporation, a Delaware corporation ("PARENT"), to enter into an
agreement and plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare
Holdings Corp., a Delaware corporation (the "COMPANY"), Buyer has required that
Stockholder, and Stockholder has agreed to, enter into this Agreement; and

               WHEREAS, the Merger Agreement provides, among other things, upon
the terms and subject to the conditions thereof, for the acquisition by Buyer of
all the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

               WHEREAS, as of the date hereof, Stockholder owns (both
beneficially and of record) 663,842 shares of Company Common Stock.

               NOW, THEREFORE, the parties hereto agree as follows:



                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

               SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably
and unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired by purchase, exercise of options or otherwise, at any time
after the date hereof and 

<PAGE>   2

prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

               SECTION 1.02. Voting Agreement. (a) Stockholder hereby
irrevocably and unconditionally agrees to vote or cause to be voted all Shares
that such Stockholder is entitled to vote at the time of any vote of the
stockholders of the Company where such matters arise (i) in favor of the
approval and adoption of the Merger Agreement and in favor of the transactions
contemplated thereby and (ii) against any (A) Acquisition Proposal (other than
the Merger), (B) reorganization, recapitalization, liquidation or winding up of
the Company or any other extraordinary transaction involving the Company, (C)
corporate action the consummation of which would frustrate the purposes, or
prevent or delay the consummation, of the transactions contemplated by the
Merger Agreement or (D) other matter relating to, or in connection with, any of
the matters referred to in clause (A), (B) or (C) above.

                  (b) If any stockholder vote in respect of the Merger Agreement
or any of the transactions contemplated by the Merger Agreement is taken by
written consent, the provisions of this Agreement imposing obligations in
respect of or in connection with any vote of stockholders shall apply mutatis
mutandis to such action by written consent.

               SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably
and unconditionally revokes any and all previous proxies granted with respect to
the Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute 

                                       2
<PAGE>   3

such further documents as may be required to vest in Buyer the sole
power to vote the Shares during the term of the proxy granted herein.



                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

               Stockholder represents and warrants to Buyer that:

               SECTION 2.01. Corporate Authorization; Binding Effect.
Stockholder has all requisite corporate power and corporate authority to enter
into this Agreement and to consummate the transactions contemplated hereby. The
execution and delivery of this Agreement and the consummation by Stockholder of
the transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

               SECTION 2.02. Non-Contravention; Governmental Authorization. (a)
The execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

                  (b) The execution and delivery of this Agreement by
Stockholder does not, and the performance of this Agreement by Stockholder shall
not, require any consent, approval, authorization or permit of, or filing with
or notification to, any governmental or regulatory authority, domestic or
foreign, except for applicable 

                                       3
<PAGE>   4

requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

               SECTION 2.03.  Ownership of Shares.  Stockholder is the sole,
true, lawful, beneficial and record owner of 663,842 Shares free and clear of
any Lien and any other limitation or restriction (including any restriction on
the right to vote or otherwise dispose of the Shares). Upon delivery of the
Shares and payment of the purchase price therefor, Buyer will receive good and
marketable title to the Shares free and clear of any pledge, lien, security
interest, charge, claim, equity, option, proxy, voting restriction or
encumbrance of any kind. None of the Shares is subject to any voting trust or
other agreement or arrangement with respect to the voting of such Shares.

               SECTION 2.04. Total Shares. Except for the Shares referred to in
2.03, Stockholder does not beneficially own any (i) shares of capital stock or
voting securities of the Company, (ii) securities of the Company convertible
into or exchangeable for shares of capital stock or voting securities of the
Company or (iii) options or other rights to acquire from the Company any capital
stock, voting securities or securities convertible into or exchangeable for
capital stock or voting securities of the Company.

               SECTION 2.05. Finder's Fees. No investment banker, broker, finder
or other intermediary is entitled to a fee or commission from Buyer or the
Company in respect of this Agreement based upon any arrangement or agreement
made by or on behalf of Stockholder.



                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

               Buyer represents and warrants to Stockholder:

               SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by bankruptcy, insolvency, reorganization, moratorium and other similar
laws 


                                       4
<PAGE>   5

relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).



                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

               Stockholder hereby covenants and agrees that:

               SECTION 4.01. No Proxies for, Encumbrances or Transfers of
Shares. Except pursuant to the terms of this Agreement, Stockholder shall not,
without the prior written consent of Buyer, directly or indirectly, (i) grant
any proxies or enter into any voting trust or other agreement or arrangement
with respect to the voting of any Shares or any options, warrants or other
rights to acquire Company Common Stock or (ii) sell, assign, transfer, encumber,
mortgage, or otherwise dispose of, or enter into any contract, option or other
arrangement or understanding with respect to the direct or indirect sale,
assignment, transfer, encumbrance, mortgage or other disposition of, any Shares
or any options, warrants or other rights to acquire Company Common Stock during
the term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

               SECTION 4.02. Other Offers. From the date hereof until the
termination hereof, Stockholder and the officers, directors, employees or other
agents of Stockholder will not, directly or indirectly, (i) take any action to
solicit, initiate or encourage any Acquisition Proposal or (ii) engage in
negotiations with, or disclose any nonpublic information relating to the Company
or any Subsidiary or afford access to the properties, books or records of the
Company or any Subsidiary to, any Person. Stockholder will promptly (and in no
event later than 24 hours after receipt of the relevant Acquisition Proposal)
notify (which notice shall be provided orally and in writing and shall identify
the Person making the relevant Acquisition Proposal and set forth the material
terms thereof) Buyer after (i) such Stockholder has received any Acquisition
Proposal, (ii) such Stockholder has been advised that any Person is considering
making an Acquisition Proposal, or (iii) such Stockholder has received any
request for nonpublic information relating to the Company or any Subsidiary, or
for access to the properties, books 

                                       5
<PAGE>   6

or records of the Company or any Subsidiary, by any Person. Stockholder will
keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

               SECTION 4.03. Action in Stockholder Capacity Only. Stockholder
makes no agreement or understanding herein as director or officer of the
Company. Stockholder signs solely in his capacity as a recordholder and
beneficial owner of the Shares, and nothing herein shall limit or affect any
actions taken in his capacity as an officer or director of the Company.

               SECTION 4.04. Appraisal Rights. Stockholder agrees not to
exercise any rights (including, without limitation, under Section 262 of the
General Corporation Law of the State of Delaware) to demand appraisal of any
Shares which may arise with respect to the Merger.

               SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.



                                    ARTICLE 5
                                  MISCELLANEOUS

               SECTION 5.01. Anti-dilution Adjustments. In the event of any
change in the number of Shares owned by Stockholder by reason of any stock
dividend, split-up, recapitalization, merger or other change in the corporate or
capital structure of the Company, the number of Shares and the Per Share Amount
shall be appropriately adjusted, and Buyer shall be entitled to receive any
non-cash distributions made in respect of any Shares purchased hereunder.

               SECTION 5.02. Entire Agreement. This Agreement constitutes the
entire agreement between Buyer and Stockholder with respect to the subject
matter hereof and supersedes all prior agreements and understandings, both
written and oral, between Buyer and Stockholder with respect to the subject
matter hereof.

                                       6
<PAGE>   7

               SECTION 5.03. Successors and Assigns. The provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns; provided that no party may assign,
delegate or otherwise transfer any of its rights or obligations under this
Agreement without the consent of the other party hereto, except that Buyer may
transfer or assign its rights and obligations to any affiliate of Buyer.

               SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

               SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

               SECTION 5.06. Amendments; Termination. Any provision of this
Agreement may be amended or waived if, and only if, such amendment or waiver is
in writing and is signed, in the case of an amendment, by each party to this
Agreement or in the case of a waiver, by the party against whom the waiver is to
be effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

               SECTION 5.07.  Expenses.  All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such cost or
expense.

               SECTION 5.08.  Governing Law.  This Agreement shall be construed
in accordance with and governed by the laws of the State of Delaware.

               SECTION 5.09. Counterparts; Effectiveness; Third Party. This
Agreement may be signed in any number of counterparts, each of which shall be an
original, with the same effect as if the signatures thereto and hereto were upon
the same instrument. This Agreement shall become effective on the date hereof.
No provision of this Agreement is intended to confer upon any Person other than
the parties hereto any rights or remedies hereunder.

               SECTION 5.10. Severability. If any term, provision or covenant of
this Agreement is held by a court of competent jurisdiction or other authority
to be invalid, void or unenforceable, the remainder of the terms, provisions and


                                       7
<PAGE>   8

covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

               SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

               SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

               (b) For purposes of the Agreement, the term "beneficially own"
shall have the meaning set forth in Rule 13d-3 promulgated under the Exchange
Act.

               (c) For purposes of this Agreement, the term "MERGER AGREEMENT"
includes the Merger Agreement, as the same may be modified or amended from time
to time; provided that no such amendment or modification amends or modifies the
Merger Agreement in a manner such that the Merger Agreement, as so amended or
modified, is less favorable to Stockholder in any material respect than is the
Merger Agreement in effect on the date hereof.

               (d) For purposes of this Agreement, the term "OFFER" includes the
Offer, as the same may be modified or amended from time to time; provided that
no such amendment or modification amends or modifies the Offer in a manner such
that the Offer, as so amended or modified, is less favorable to Stockholder in
any material respect than is the Offer in effect before such amendment or
modification.


                                       8
<PAGE>   9

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

                                       OSCAR ACQUISITION CORPORATION


                                       By:  /s/  David A. Cox
                                           ------------------------------------
                                            Name:   David A. Cox
                                            Title:  President

                                       SEQUOIA CAPITAL GROWTH FUND

                                       By: Sequoia Partners CF


                                       By: /s/  Thomas F. Stephenson
                                           ------------------------------------
                                           Thomas F. Stephenson
                                           General Partner



                                       9

<PAGE>   1
                                                                       EXHIBIT 9


                              STOCKHOLDER AGREEMENT

        STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and Sequoia
Technology Partners III ("STOCKHOLDER").

        WHEREAS, in order to induce Buyer and Science Applications International
Corporation, a Delaware corporation ("PARENT"), to enter into an agreement and
plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare Holdings Corp., a
Delaware corporation (the "COMPANY"), Buyer has required that Stockholder, and
Stockholder has agreed to, enter into this Agreement; and

        WHEREAS, the Merger Agreement provides, among other things, upon the
terms and subject to the conditions thereof, for the acquisition by Buyer of all
the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

        WHEREAS, as of the date hereof, Stockholder owns (both beneficially and
of record) 42,373 shares of Company Common Stock.

        NOW, THEREFORE, the parties hereto agree as follows:



                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

        SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably and
unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired by purchase, exercise of options or otherwise, at any time
after the date hereof and


                                       1

<PAGE>   2

prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

        SECTION 1.02. Voting Agreement. (a) Stockholder hereby irrevocably and
unconditionally agrees to vote or cause to be voted all Shares that such
Stockholder is entitled to vote at the time of any vote of the stockholders of
the Company where such matters arise (i) in favor of the approval and adoption
of the Merger Agreement and in favor of the transactions contemplated thereby
and (ii) against any (A) Acquisition Proposal (other than the Merger), (B)
reorganization, recapitalization, liquidation or winding up of the Company or
any other extraordinary transaction involving the Company, (C) corporate action
the consummation of which would frustrate the purposes, or prevent or delay the
consummation, of the transactions contemplated by the Merger Agreement or (D)
other matter relating to, or in connection with, any of the matters referred to
in clause (A), (B) or (C) above.

       (b) If any stockholder vote in respect of the Merger Agreement or any of
the transactions contemplated by the Merger Agreement is taken by written
consent, the provisions of this Agreement imposing obligations in respect of or
in connection with any vote of stockholders shall apply mutatis mutandis to such
action by written consent.

        SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably and
unconditionally revokes any and all previous proxies granted with respect to the
Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute


                                       2

<PAGE>   3



such further documents as may be required to vest in Buyer the sole power to
vote the Shares during the term of the proxy granted herein.



                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

        Stockholder represents and warrants to Buyer that:

        SECTION 2.01. Corporate Authorization; Binding Effect. Stockholder has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Stockholder of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

        SECTION 2.02. Non-Contravention; Governmental Authorization. (a) The
execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

       (b) The execution and delivery of this Agreement by Stockholder does not,
and the performance of this Agreement by Stockholder shall not, require any
consent, approval, authorization or permit of, or filing with or notification
to, any governmental or regulatory authority, domestic or foreign, except for
applicable


                                       3

<PAGE>   4


requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

        SECTION 2.03. Ownership of Shares. Stockholder is the sole, true,
lawful, beneficial and record owner of 42,373 Shares free and clear of any Lien
and any other limitation or restriction (including any restriction on the right
to vote or otherwise dispose of the Shares). Upon delivery of the Shares and
payment of the purchase price therefor, Buyer will receive good and marketable
title to the Shares free and clear of any pledge, lien, security interest,
charge, claim, equity, option, proxy, voting restriction or encumbrance of any
kind. None of the Shares is subject to any voting trust or other agreement or
arrangement with respect to the voting of such Shares.

        SECTION 2.04. Total Shares. Except for the Shares referred to in 2.03,
Stockholder does not beneficially own any (i) shares of capital stock or voting
securities of the Company, (ii) securities of the Company convertible into or
exchangeable for shares of capital stock or voting securities of the Company or
(iii) options or other rights to acquire from the Company any capital stock,
voting securities or securities convertible into or exchangeable for capital
stock or voting securities of the Company.

        SECTION 2.05. Finder's Fees. No investment banker, broker, finder or
other intermediary is entitled to a fee or commission from Buyer or the Company
in respect of this Agreement based upon any arrangement or agreement made by or
on behalf of Stockholder.



                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

        Buyer represents and warrants to Stockholder:

        SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has all
requisite corporate power and corporate authority to enter into this Agreement
and to consummate the transactions contemplated hereby. The execution and
delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by bankruptcy, insolvency, reorganization, moratorium and other similar
laws


                                       4

<PAGE>   5



relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).


                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

        Stockholder hereby covenants and agrees that:

        SECTION 4.01. No Proxies for, Encumbrances or Transfers of Shares.
Except pursuant to the terms of this Agreement, Stockholder shall not, without
the prior written consent of Buyer, directly or indirectly, (i) grant any
proxies or enter into any voting trust or other agreement or arrangement with
respect to the voting of any Shares or any options, warrants or other rights to
acquire Company Common Stock or (ii) sell, assign, transfer, encumber, mortgage,
or otherwise dispose of, or enter into any contract, option or other arrangement
or understanding with respect to the direct or indirect sale, assignment,
transfer, encumbrance, mortgage or other disposition of, any Shares or any
options, warrants or other rights to acquire Company Common Stock during the
term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

        SECTION 4.02. Other Offers. From the date hereof until the termination
hereof, Stockholder and the officers, directors, employees or other agents of
Stockholder will not, directly or indirectly, (i) take any action to solicit,
initiate or encourage any Acquisition Proposal or (ii) engage in negotiations
with, or disclose any nonpublic information relating to the Company or any
Subsidiary or afford access to the properties, books or records of the Company
or any Subsidiary to, any Person. Stockholder will promptly (and in no event
later than 24 hours after receipt of the relevant Acquisition Proposal) notify
(which notice shall be provided orally and in writing and shall identify the
Person making the relevant Acquisition Proposal and set forth the material terms
thereof) Buyer after (i) such Stockholder has received any Acquisition Proposal,
(ii) such Stockholder has been advised that any Person is considering making an
Acquisition Proposal, or (iii) such Stockholder has received any request for
nonpublic information relating to the Company or any Subsidiary, or for access
to the properties, books


                                       5

<PAGE>   6

or records of the Company or any Subsidiary, by any Person. Stockholder will
keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

        SECTION 4.03. Action in Stockholder Capacity Only. Stockholder makes no
agreement or understanding herein as director or officer of the Company.
Stockholder signs solely in his capacity as a recordholder and beneficial owner
of the Shares, and nothing herein shall limit or affect any actions taken in his
capacity as an officer or director of the Company.

        SECTION 4.04. Appraisal Rights. Stockholder agrees not to exercise any
rights (including, without limitation, under Section 262 of the General
Corporation Law of the State of Delaware) to demand appraisal of any Shares
which may arise with respect to the Merger.

        SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.

                                   ARTICLE 5
                                 MISCELLANEOUS

        SECTION 5.01. Anti-dilution Adjustments. In the event of any change in
the number of Shares owned by Stockholder by reason of any stock dividend,
split-up, recapitalization, merger or other change in the corporate or capital
structure of the Company, the number of Shares and the Per Share Amount shall be
appropriately adjusted, and Buyer shall be entitled to receive any non-cash
distributions made in respect of any Shares purchased hereunder.

        SECTION 5.02. Entire Agreement. This Agreement constitutes the entire
agreement between Buyer and Stockholder with respect to the subject matter
hereof and supersedes all prior agreements and understandings, both written and
oral, between Buyer and Stockholder with respect to the subject matter hereof.



                                       6

<PAGE>   7
        SECTION 5.03. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns; provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of the other party hereto, except that Buyer may transfer or
assign its rights and obligations to any affiliate of Buyer.

        SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

        SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

        SECTION 5.06. Amendments; Termination. Any provision of this Agreement
may be amended or waived if, and only if, such amendment or waiver is in writing
and is signed, in the case of an amendment, by each party to this Agreement or
in the case of a waiver, by the party against whom the waiver is to be
effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

        SECTION 5.07.  Expenses.  All costs and expenses incurred in connection
with this Agreement shall be paid by the party incurring such cost or expense.

        SECTION 5.08.  Governing Law.  This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware.

        SECTION 5.09. Counterparts; Effectiveness; Third Party. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective on the date hereof. No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.

        SECTION 5.10.  Severability.  If any term, provision or covenant of this
Agreement is held by a court of competent jurisdiction or other authority to be
invalid, void or unenforceable, the remainder of the terms, provisions and


                                       7

<PAGE>   8
covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

        SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

        SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

        (b) For purposes of the Agreement, the term "beneficially own" shall
have the meaning set forth in Rule 13d-3 promulgated under the Exchange Act.

        (c) For purposes of this Agreement, the term "MERGER AGREEMENT" includes
the Merger Agreement, as the same may be modified or amended from time to time;
provided that no such amendment or modification amends or modifies the Merger
Agreement in a manner such that the Merger Agreement, as so amended or modified,
is less favorable to Stockholder in any material respect than is the Merger
Agreement in effect on the date hereof.

        (d) For purposes of this Agreement, the term "OFFER" includes the Offer,
as the same may be modified or amended from time to time; provided that no such
amendment or modification amends or modifies the Offer in a manner such that the
Offer, as so amended or modified, is less favorable to Stockholder in any
material respect than is the Offer in effect before such amendment or
modification.


                                       8

<PAGE>   9
        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                 OSCAR ACQUISITION CORPORATION


                                 By:           /s/ David A. Cox
                                    --------------------------------------------
                                    Name:  David A. Cox
                                    Title: President

                                 SEQUOIA TECHNOLOGY PARTNERS III

                                 By: Sequoia Technology Partners III


                                 By:    /s/  Thomas F. Stephenson
                                    --------------------------------------------
                                    Thomas F. Stephenson
                                    General Partner


                                       9

<PAGE>   1
                                                                      EXHIBIT 10

                              STOCKHOLDER AGREEMENT

        STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and WPG Enterprise
Fund II, L.L.C. ("STOCKHOLDER").

        WHEREAS, in order to induce Buyer and Science Applications International
Corporation, a Delaware corporation ("PARENT"), to enter into an agreement and
plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare Holdings Corp., a
Delaware corporation (the "COMPANY"), Buyer has required that Stockholder, and
Stockholder has agreed to, enter into this Agreement; and

        WHEREAS, the Merger Agreement provides, among other things, upon the
terms and subject to the conditions thereof, for the acquisition by Buyer of all
the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

        WHEREAS, as of the date hereof, Stockholder owns (both beneficially and
of record) 342,982 shares of Company Common Stock.

        NOW, THEREFORE, the parties hereto agree as follows:



                                   ARTICLE 1
             AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

        SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably and
unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired


                                       1

<PAGE>   2
by purchase, exercise of options or otherwise, at any time after the date hereof
and prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

        SECTION 1.02. Voting Agreement. (a) Stockholder hereby irrevocably and
unconditionally agrees to vote or cause to be voted all Shares that such
Stockholder is entitled to vote at the time of any vote of the stockholders of
the Company where such matters arise (i) in favor of the approval and adoption
of the Merger Agreement and in favor of the transactions contemplated thereby
and (ii) against any (A) Acquisition Proposal (other than the Merger), (B)
reorganization, recapitalization, liquidation or winding up of the Company or
any other extraordinary transaction involving the Company, (C) corporate action
the consummation of which would frustrate the purposes, or prevent or delay the
consummation, of the transactions contemplated by the Merger Agreement or (D)
other matter relating to, or in connection with, any of the matters referred to
in clause (A), (B) or (C) above.

       (b) If any stockholder vote in respect of the Merger Agreement or any of
the transactions contemplated by the Merger Agreement is taken by written
consent, the provisions of this Agreement imposing obligations in respect of or
in connection with any vote of stockholders shall apply mutatis mutandis to such
action by written consent.

        SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably and
unconditionally revokes any and all previous proxies granted with respect to the
Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute


                                       2

<PAGE>   3
such further documents as may be required to vest in Buyer the sole power to
vote the Shares during the term of the proxy granted herein.



                                   ARTICLE 2
                 REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

        Stockholder represents and warrants to Buyer that:

        SECTION 2.01. Corporate Authorization; Binding Effect. Stockholder has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Stockholder of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

        SECTION 2.02. Non-Contravention; Governmental Authorization. (a) The
execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

       (b) The execution and delivery of this Agreement by Stockholder does not,
and the performance of this Agreement by Stockholder shall not, require any
consent, approval, authorization or permit of, or filing with or notification
to, any governmental or regulatory authority, domestic or foreign, except for
applicable



                                       3

<PAGE>   4
requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

        SECTION 2.03. Ownership of Shares. Stockholder is the sole, true,
lawful, beneficial and record owner of 342,982 Shares free and clear of any Lien
and any other limitation or restriction (including any restriction on the right
to vote or otherwise dispose of the Shares). Upon delivery of the Shares and
payment of the purchase price therefor, Buyer will receive good and marketable
title to the Shares free and clear of any pledge, lien, security interest,
charge, claim, equity, option, proxy, voting restriction or encumbrance of any
kind. None of the Shares is subject to any voting trust or other agreement or
arrangement with respect to the voting of such Shares.

        SECTION 2.04. Total Shares. Except for the Shares referred to in 2.03,
Stockholder does not beneficially own any (i) shares of capital stock or voting
securities of the Company, (ii) securities of the Company convertible into or
exchangeable for shares of capital stock or voting securities of the Company or
(iii) options or other rights to acquire from the Company any capital stock,
voting securities or securities convertible into or exchangeable for capital
stock or voting securities of the Company.

        SECTION 2.05. Finder's Fees. No investment banker, broker, finder or
other intermediary is entitled to a fee or commission from Buyer or the Company
in respect of this Agreement based upon any arrangement or agreement made by or
on behalf of Stockholder.


                                   ARTICLE 3
                    REPRESENTATIONS AND WARRANTIES OF BUYER

        Buyer represents and warrants to Stockholder:

        SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has all
requisite corporate power and corporate authority to enter into this Agreement
and to consummate the transactions contemplated hereby. The execution and
delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by bankruptcy, insolvency, reorganization, moratorium and other similar
laws


                                       4

<PAGE>   5

relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).



                                   ARTICLE 4
                            COVENANTS OF STOCKHOLDER

        Stockholder hereby covenants and agrees that:

        SECTION 4.01. No Proxies for, Encumbrances or Transfers of Shares.
Except pursuant to the terms of this Agreement, Stockholder shall not, without
the prior written consent of Buyer, directly or indirectly, (i) grant any
proxies or enter into any voting trust or other agreement or arrangement with
respect to the voting of any Shares or any options, warrants or other rights to
acquire Company Common Stock or (ii) sell, assign, transfer, encumber, mortgage,
or otherwise dispose of, or enter into any contract, option or other arrangement
or understanding with respect to the direct or indirect sale, assignment,
transfer, encumbrance, mortgage or other disposition of, any Shares or any
options, warrants or other rights to acquire Company Common Stock during the
term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

        SECTION 4.02. Other Offers. From the date hereof until the termination
hereof, Stockholder and the officers, directors, employees or other agents of
Stockholder will not, directly or indirectly, (i) take any action to solicit,
initiate or encourage any Acquisition Proposal or (ii) engage in negotiations
with, or disclose any nonpublic information relating to the Company or any
Subsidiary or afford access to the properties, books or records of the Company
or any Subsidiary to, any Person. Stockholder will promptly (and in no event
later than 24 hours after receipt of the relevant Acquisition Proposal) notify
(which notice shall be provided orally and in writing and shall identify the
Person making the relevant Acquisition Proposal and set forth the material terms
thereof) Buyer after (i) such Stockholder has received any Acquisition Proposal,
(ii) such Stockholder has been advised that any Person is considering making an
Acquisition Proposal, or (iii) such Stockholder has received any request for
nonpublic information relating to the Company or any Subsidiary, or for access
to the properties, books



                                       5

<PAGE>   6
or records of the Company or any Subsidiary, by any Person. Stockholder will
keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

        SECTION 4.03. Action in Stockholder Capacity Only. Stockholder makes no
agreement or understanding herein as director or officer of the Company.
Stockholder signs solely in his capacity as a recordholder and beneficial owner
of the Shares, and nothing herein shall limit or affect any actions taken in his
capacity as an officer or director of the Company.

        SECTION 4.04. Appraisal Rights. Stockholder agrees not to exercise any
rights (including, without limitation, under Section 262 of the General
Corporation Law of the State of Delaware) to demand appraisal of any Shares
which may arise with respect to the Merger.

        SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.


                                   ARTICLE 5
                                 MISCELLANEOUS

        SECTION 5.01. Anti-dilution Adjustments. In the event of any change in
the number of Shares owned by Stockholder by reason of any stock dividend,
split-up, recapitalization, merger or other change in the corporate or capital
structure of the Company, the number of Shares and the Per Share Amount shall be
appropriately adjusted, and Buyer shall be entitled to receive any non-cash
distributions made in respect of any Shares purchased hereunder.

        SECTION 5.02. Entire Agreement. This Agreement constitutes the entire
agreement between Buyer and Stockholder with respect to the subject matter
hereof and supersedes all prior agreements and understandings, both written and
oral, between Buyer and Stockholder with respect to the subject matter hereof.



                                       6

<PAGE>   7
        SECTION 5.03. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns; provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of the other party hereto, except that Buyer may transfer or
assign its rights and obligations to any affiliate of Buyer.

        SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

        SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

        SECTION 5.06. Amendments; Termination. Any provision of this Agreement
may be amended or waived if, and only if, such amendment or waiver is in writing
and is signed, in the case of an amendment, by each party to this Agreement or
in the case of a waiver, by the party against whom the waiver is to be
effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

        SECTION 5.07.  Expenses.  All costs and expenses incurred in connection
with this Agreement shall be paid by the party incurring such cost or expense.

        SECTION 5.08.  Governing Law.  This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware.

        SECTION 5.09. Counterparts; Effectiveness; Third Party. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective on the date hereof. No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.

        SECTION 5.10.  Severability.  If any term, provision or covenant of this
Agreement is held by a court of competent jurisdiction or other authority to be
invalid, void or unenforceable, the remainder of the terms, provisions and

                                       7

<PAGE>   8
covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

        SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

        SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

        (b) For purposes of the Agreement, the term "beneficially own" shall
have the meaning set forth in Rule 13d-3 promulgated under the Exchange Act.

        (c) For purposes of this Agreement, the term "MERGER AGREEMENT" includes
the Merger Agreement, as the same may be modified or amended from time to time;
provided that no such amendment or modification amends or modifies the Merger
Agreement in a manner such that the Merger Agreement, as so amended or modified,
is less favorable to Stockholder in any material respect than is the Merger
Agreement in effect on the date hereof.

        (d) For purposes of this Agreement, the term "OFFER" includes the Offer,
as the same may be modified or amended from time to time; provided that no such
amendment or modification amends or modifies the Offer in a manner such that the
Offer, as so amended or modified, is less favorable to Stockholder in any
material respect than is the Offer in effect before such amendment or
modification.



                                       8

<PAGE>   9
        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                    OSCAR ACQUISITION CORPORATION


                                    By:    /s/ David A. Cox
                                       ----------------------------------------
                                        Name:  David A. Cox
                                        Title: President


                                    WPG ENTERPRISE  FUND II, L.L.C.

                                    By  WPG Venture Partners III, L.P., Fund
                                         Investment Advisory Member


                                    By:    /s/ Annette Bianchi
                                       ----------------------------------------
                                        Annette Bianchi
                                        General Partner



                                       9


<PAGE>   1
                                                                      EXHIBIT 11

                              STOCKHOLDER AGREEMENT

        STOCKHOLDER AGREEMENT dated as of February 21, 1999 between Oscar
Acquisition Corporation, a Delaware corporation ("BUYER"), and Weiss, Peck &
Greer Venture Associates III, L.L.C. ("STOCKHOLDER").

        WHEREAS, in order to induce Buyer and Science Applications International
Corporation, a Delaware corporation ("PARENT"), to enter into an agreement and
plan of merger (the "MERGER AGREEMENT") with Oacis Healthcare Holdings Corp., a
Delaware corporation (the "COMPANY"), Buyer has required that Stockholder, and
Stockholder has agreed to, enter into this Agreement; and

        WHEREAS, the Merger Agreement provides, among other things, upon the
terms and subject to the conditions thereof, for the acquisition by Buyer of all
the outstanding shares of Common Stock, par value $0.01 per share, of the
Company (the "COMPANY COMMON STOCK") through (a) a tender offer (the "OFFER")
for all shares of Company Common Stock for $4.45 per share net to the sellers
thereof in cash (the "PER SHARE AMOUNT") and (b) a second-step merger pursuant
to which Buyer will merge with the Company (the "MERGER") and all outstanding
shares of Company Common Stock other than shares of Company Common Stock held by
Parent or any directly or indirectly wholly owned subsidiary of Parent or shares
of Company Common Stock held in the treasury of the Company will be converted
into the right to receive the Per Share Amount in cash; and

        WHEREAS, as of the date hereof, Stockholder owns (both beneficially and
of record) 285,109 shares of Company Common Stock.

        NOW, THEREFORE, the parties hereto agree as follows:


                                    ARTICLE 1
              AGREEMENT TO TENDER; VOTING AGREEMENT; GRANT OF PROXY

        SECTION 1.01. Agreement to Tender. Stockholder hereby irrevocably and
unconditionally agrees to validly tender (and not withdraw) or cause to be
validly tendered (and not withdrawn) pursuant to and in accordance with the
terms of the Offer all of the shares of capital stock of the Company that
Stockholder beneficially owns as of the date hereof as well as any additional
shares of capital stock of the Company that Stockholder may beneficially own,
whether acquired by purchase, exercise of options or otherwise, at any time
after the date hereof and

<PAGE>   2

prior to the expiration of the Offer, as the expiration of the Offer may be
extended from time to time (the "SHARES"). Within five business days after the
commencement of the Offer, Stockholder shall deliver to the depositary
designated in the Offer (i) a letter of transmittal with respect to the Shares
complying with the terms of the Offer, (ii) certificates representing all of the
Shares and (iii) all other documents or instruments required to be delivered
pursuant to the terms of the Offer.

        SECTION 1.02. Voting Agreement. (a) Stockholder hereby irrevocably and
unconditionally agrees to vote or cause to be voted all Shares that such
Stockholder is entitled to vote at the time of any vote of the stockholders of
the Company where such matters arise (i) in favor of the approval and adoption
of the Merger Agreement and in favor of the transactions contemplated thereby
and (ii) against any (A) Acquisition Proposal (other than the Merger), (B)
reorganization, recapitalization, liquidation or winding up of the Company or
any other extraordinary transaction involving the Company, (C) corporate action
the consummation of which would frustrate the purposes, or prevent or delay the
consummation, of the transactions contemplated by the Merger Agreement or (D)
other matter relating to, or in connection with, any of the matters referred to
in clause (A), (B) or (C) above.

       (b) If any stockholder vote in respect of the Merger Agreement or any of
the transactions contemplated by the Merger Agreement is taken by written
consent, the provisions of this Agreement imposing obligations in respect of or
in connection with any vote of stockholders shall apply mutatis mutandis to such
action by written consent.

        SECTION 1.03. Irrevocable Proxy. Stockholder hereby irrevocably and
unconditionally revokes any and all previous proxies granted with respect to the
Shares. By entering into this Agreement, Stockholder hereby irrevocably and
unconditionally grants a proxy appointing Buyer as such Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in such
Stockholder's name, to vote, express, consent or dissent, or otherwise to
utilize such voting power in the manner contemplated by Section 1.02 above as
Buyer or its proxy or substitute shall, in Buyer's sole discretion, deem proper
with respect to the Shares. The proxy granted by Stockholder pursuant to this
Article 1 is irrevocable and is granted in consideration of Buyer entering into
this Agreement and the Merger Agreement and incurring certain related fees and
expenses. The proxy granted by Stockholder shall be revoked upon termination of
this Agreement in accordance with its terms. Stockholder shall use its best
effort to cause any record owner of Shares to grant to Buyer a proxy to the same
effect as that contained herein. Stockholder shall perform such further acts and
execute


                                       2
<PAGE>   3

such further documents as may be required to vest in Buyer the sole power to
vote the Shares during the term of the proxy granted herein.


                                    ARTICLE 2
                  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

        Stockholder represents and warrants to Buyer that:

        SECTION 2.01. Corporate Authorization; Binding Effect. Stockholder has
all requisite corporate power and corporate authority to enter into this
Agreement and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement and the consummation by Stockholder of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of Stockholder. This Agreement has been duly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against it in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium and other similar laws relating to or affecting
creditors generally and by general equity principles (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

        SECTION 2.02. Non-Contravention; Governmental Authorization. (a) The
execution, delivery and performance by Stockholder of this Agreement and the
consummation of the transactions contemplated hereby do not and will not (i)
contravene or conflict with the certificate of incorporation or bylaws or other
organizational document of such Stockholder, (ii) contravene or conflict with or
constitute a violation of any provision of any law, regulation, judgment,
injunction, order or decree binding upon or applicable to such Stockholder,
(iii) require any consent or other action by any Person under, constitute a
default under, or give rise to a right of termination, cancellation or
acceleration of any right or obligation or to a loss of any benefit to which
such Stockholder is entitled under any provision of any agreement, contract or
other instrument binding on such Stockholder or (iv) result in the creation or
imposition of any Lien on any asset of such Stockholder.

       (b) The execution and delivery of this Agreement by Stockholder does not,
and the performance of this Agreement by Stockholder shall not, require any
consent, approval, authorization or permit of, or filing with or notification
to, any governmental or regulatory authority, domestic or foreign, except for
applicable


                                       3
<PAGE>   4

requirements, if any, of the Exchange Act and the HSR Act and the rules and
regulations thereunder.

        SECTION 2.03. Ownership of Shares. Stockholder is the sole, true,
lawful, beneficial and record owner of 285,109 Shares free and clear of any Lien
and any other limitation or restriction (including any restriction on the right
to vote or otherwise dispose of the Shares). Upon delivery of the Shares and
payment of the purchase price therefor, Buyer will receive good and marketable
title to the Shares free and clear of any pledge, lien, security interest,
charge, claim, equity, option, proxy, voting restriction or encumbrance of any
kind. None of the Shares is subject to any voting trust or other agreement or
arrangement with respect to the voting of such Shares.

        SECTION 2.04. Total Shares. Except for the Shares referred to in 2.03,
Stockholder does not beneficially own any (i) shares of capital stock or voting
securities of the Company, (ii) securities of the Company convertible into or
exchangeable for shares of capital stock or voting securities of the Company or
(iii) options or other rights to acquire from the Company any capital stock,
voting securities or securities convertible into or exchangeable for capital
stock or voting securities of the Company.

        SECTION 2.05. Finder's Fees. No investment banker, broker, finder or
other intermediary is entitled to a fee or commission from Buyer or the Company
in respect of this Agreement based upon any arrangement or agreement made by or
on behalf of Stockholder.



                                    ARTICLE 3
                     REPRESENTATIONS AND WARRANTIES OF BUYER

        Buyer represents and warrants to Stockholder:

        SECTION 3.01. Corporate Authorization; Binding Effect. Buyer has all
requisite corporate power and corporate authority to enter into this Agreement
and to consummate the transactions contemplated hereby. The execution and
delivery of this Agreement and the consummation by Buyer of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of Buyer. This Agreement has been duly executed and delivered by
Buyer and constitutes a valid and binding agreement of Buyer, enforceable
against it in accordance with its terms, except as such enforceability may be
limited by bankruptcy, insolvency, reorganization, moratorium and other similar
laws


                                       4
<PAGE>   5

relating to or affecting creditors generally and by general equity principles
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).


                                    ARTICLE 4
                            COVENANTS OF STOCKHOLDER

        Stockholder hereby covenants and agrees that:

        SECTION 4.01. No Proxies for, Encumbrances or Transfers of Shares.
Except pursuant to the terms of this Agreement, Stockholder shall not, without
the prior written consent of Buyer, directly or indirectly, (i) grant any
proxies or enter into any voting trust or other agreement or arrangement with
respect to the voting of any Shares or any options, warrants or other rights to
acquire Company Common Stock or (ii) sell, assign, transfer, encumber, mortgage,
or otherwise dispose of, or enter into any contract, option or other arrangement
or understanding with respect to the direct or indirect sale, assignment,
transfer, encumbrance, mortgage or other disposition of, any Shares or any
options, warrants or other rights to acquire Company Common Stock during the
term of this Agreement. Stockholder shall not seek or solicit any such sale,
assignment, transfer, encumbrance, mortgage, or other disposition or any such
contract, option or other arrangement or understanding and agrees to notify
Buyer promptly, and to provide all details requested by Buyer, if such
Stockholder shall be approached or solicited, directly or indirectly, by any
Person with respect to any of the foregoing.

        SECTION 4.02. Other Offers. From the date hereof until the termination
hereof, Stockholder and the officers, directors, employees or other agents of
Stockholder will not, directly or indirectly, (i) take any action to solicit,
initiate or encourage any Acquisition Proposal or (ii) engage in negotiations
with, or disclose any nonpublic information relating to the Company or any
Subsidiary or afford access to the properties, books or records of the Company
or any Subsidiary to, any Person. Stockholder will promptly (and in no event
later than 24 hours after receipt of the relevant Acquisition Proposal) notify
(which notice shall be provided orally and in writing and shall identify the
Person making the relevant Acquisition Proposal and set forth the material terms
thereof) Buyer after (i) such Stockholder has received any Acquisition Proposal,
(ii) such Stockholder has been advised that any Person is considering making an
Acquisition Proposal, or (iii) such Stockholder has received any request for
nonpublic information relating to the Company or any Subsidiary, or for access
to the properties, books


                                       5
<PAGE>   6

or records of the Company or any Subsidiary, by any Person. Stockholder will
keep Buyer fully informed of the status and details of any such Acquisition
Proposal or request. Stockholder shall, and shall cause its directors, officers,
employees, financial advisors and other agents or representatives to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any Persons conducted heretofore with respect to any
Acquisition Proposal. The provisions of this Section 4.02 shall not impose any
additional limitations upon the ability of Stockholder to exercise its fiduciary
duties as a director of the Company under applicable law.

        SECTION 4.03. Action in Stockholder Capacity Only. Stockholder makes no
agreement or understanding herein as director or officer of the Company.
Stockholder signs solely in his capacity as a recordholder and beneficial owner
of the Shares, and nothing herein shall limit or affect any actions taken in his
capacity as an officer or director of the Company.

        SECTION 4.04. Appraisal Rights. Stockholder agrees not to exercise any
rights (including, without limitation, under Section 262 of the General
Corporation Law of the State of Delaware) to demand appraisal of any Shares
which may arise with respect to the Merger.

        SECTION 4.05. Board of Directors. Stockholder agrees to take all
necessary action in order to cause all of the directors who are affiliated with
Stockholder to resign as directors of the Company upon consummation of the
Offer.


                                    ARTICLE 5
                                  MISCELLANEOUS

        SECTION 5.01. Anti-dilution Adjustments. In the event of any change in
the number of Shares owned by Stockholder by reason of any stock dividend,
split-up, recapitalization, merger or other change in the corporate or capital
structure of the Company, the number of Shares and the Per Share Amount shall be
appropriately adjusted, and Buyer shall be entitled to receive any non-cash
distributions made in respect of any Shares purchased hereunder.

        SECTION 5.02. Entire Agreement. This Agreement constitutes the entire
agreement between Buyer and Stockholder with respect to the subject matter
hereof and supersedes all prior agreements and understandings, both written and
oral, between Buyer and Stockholder with respect to the subject matter hereof.


                                       6
<PAGE>   7

        SECTION 5.03. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns; provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of the other party hereto, except that Buyer may transfer or
assign its rights and obligations to any affiliate of Buyer.

        SECTION 5.04. Survival of Representations and Warranties. The
representations and warranties and agreements contained in this Agreement shall
for a period of one year after the delivery of and payment for the Shares.

        SECTION 5.05. Further Assurances. Buyer and Stockholder will each
execute and deliver, or cause to be executed and delivered, all further
documents and instruments and use its reasonable best efforts to take, or cause
to be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations, to consummate and
make effective the transactions contemplated by this Agreement.

        SECTION 5.06. Amendments; Termination. Any provision of this Agreement
may be amended or waived if, and only if, such amendment or waiver is in writing
and is signed, in the case of an amendment, by each party to this Agreement or
in the case of a waiver, by the party against whom the waiver is to be
effective. This Agreement shall terminate on the earlier to occur of the
consummation of the Merger and the date which is 18 months after the date
hereof.

        SECTION 5.07.  Expenses.  All costs and expenses incurred in connection
with this Agreement shall be paid by the party incurring such cost or expense.

        SECTION 5.08.  Governing Law.  This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware.

        SECTION 5.09. Counterparts; Effectiveness; Third Party. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective on the date hereof. No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.

        SECTION 5.10.  Severability.  If any term, provision or covenant of this
Agreement is held by a court of competent jurisdiction or other authority to be
invalid, void or unenforceable, the remainder of the terms, provisions and


                                       7
<PAGE>   8

covenants of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

        SECTION 5.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement is
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.

        SECTION 5.12.  Defined Terms.  (a) Capitalized terms used but not
separately defined herein shall have the respective meanings set forth in the
Merger Agreement.

        (b) For purposes of the Agreement, the term "beneficially own" shall
have the meaning set forth in Rule 13d-3 promulgated under the Exchange Act.

        (c) For purposes of this Agreement, the term "MERGER AGREEMENT" includes
the Merger Agreement, as the same may be modified or amended from time to time;
provided that no such amendment or modification amends or modifies the Merger
Agreement in a manner such that the Merger Agreement, as so amended or modified,
is less favorable to Stockholder in any material respect than is the Merger
Agreement in effect on the date hereof.

        (d) For purposes of this Agreement, the term "OFFER" includes the Offer,
as the same may be modified or amended from time to time; provided that no such
amendment or modification amends or modifies the Offer in a manner such that the
Offer, as so amended or modified, is less favorable to Stockholder in any
material respect than is the Offer in effect before such amendment or
modification.


                                       8
<PAGE>   9

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

                                    OSCAR ACQUISITION CORPORATION


                                    By:      /s/  David A. Cox
                                        ----------------------------------------
                                        Name: David A. Cox
                                        Title: President

                                    Weiss, Peck & Greer Venture
                                    Associates III, L.L.C.

                                    By:  WPG Venture Partners III, L.P., Fund
                                         Investment Advisory Member


                                    By:     /s/  Annette Bianchi
                                        ----------------------------------------
                                        Annette Bianchi
                                        General Partner

                                        9

<PAGE>   1

                                                                      EXHIBIT 12

                             JOINT FILING AGREEMENT

            In accordance with Rule 13d-1(k) under the Securities Exchange Act
of 1934, as amended, each of the persons named below agrees to the joint filing
of a Statement on Schedule 13D (including amendments thereto) with respect to
the common stock, par value $0.01 per share, of Oacis Healthcare Corp., a
Delaware corporation, and further agrees that this Joint Filing Agreement be
included as an exhibit to such filings provided that, as contemplated by Section
13d-1(k)(1)(ii), no person shall be responsible for the completeness or accuracy
of the information concerning the other persons making the filing, unless such
person knows or has reason to believe that such information is inaccurate. This
Joint Filing Agreement may be executed in any number of counterparts, all of
which together shall constitute one and the same instrument.

Date: March 3, 1999

                                       OSCAR ACQUISITION CORPORATION


                                       By:     /s/ Kevin A. Werner
                                          --------------------------------------
                                               Name:   Kevin A. Werner
                                               Title:  Secretary



                                       SCIENCE APPLICATIONS INTERNATIONAL
                                         CORPORATION


                                       By:     /s/ Kevin A. Werner
                                          --------------------------------------
                                          Name:   Kevin A. Werner
                                          Title:  Assistant Secretary &
                                                  Associate General Counsel





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