XYBERNAUT CORP
S-3, 1999-06-16
COMPUTER COMMUNICATIONS EQUIPMENT
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  As filed with the Securities and Exchange Commission on June 16, 1999
                                                      Registration No. 333-
- --------------------------------------------------------------------------------


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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


                              XYBERNAUT CORPORATION
             (Exact name of registrant as specified in its charter)

         DELAWARE                                           54-1799851
 ------------------------------                        -------------------
(State or other jurisdiction of                          (I.R.S. Employer
Incorporation or organization)                         Identification No.)

                             12701 FAIR LAKES CIRCLE
                             FAIRFAX, VIRGINIA 22033
                                 (703) 631-6925
        -----------------------------------------------------------------
                   (Address, including zip code, and telephone
             number, Including area code, of registrant's principal
                               executive offices)

                                EDWARD G. NEWMAN
                             12701 FAIR LAKES CIRCLE
                             FAIRFAX, VIRGINIA 22033
                                 (703) 631-6925
        -----------------------------------------------------------------

            (Name, address, including zip code, and telephone number,
                   Including area code, of agent for service)

                                    Copy to:

                           Martin Eric Weisberg, Esq.
                       Parker Chapin Flattau & Klimpl, LLP
                           1211 Avenue of the Americas
                            New York, New York 10036
                                 (212) 704-6000

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

         APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC: As soon as
practicable after the effective date of this Registration Statement.

         If the only securities on this Form are being offered pursuant to
dividend or interest reinvestment plans, please check the following box. |_|

         If any of the securities being registered on this Form are to be
offered on a delayed or continuous basis pursuant to Rule 415 under the
Securities Act of 1933, other than securities offered only in connection with
dividend or interest reinvestment plans, check the following box. |X|

         If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. |_| __________

         If this Form is a post-effective amendment filed pursuant to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act registration statement number of the earlier effective registration
statement for the same offering. |_| __________

         If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box. |_|

<PAGE>
<TABLE>
<CAPTION>


                         CALCULATION OF REGISTRATION FEE


                                                            PROPOSED          PROPOSED
                                                            MAXIMUM            MAXIMUM         AMOUNT OF
         TITLE OF EACH CLASS          AMOUNT TO BE       OFFERING PRICE       AGGREGATE       REGISTRATION
   OF SECURITIES TO BE REGISTERED    REGISTERED (1)        PER SHARE       OFFERING PRICE         FEE
- -----------------------------------------------------------------------------------------------------------
<S>                                  <C>                 <C>               <C>                <C>
Common Stock, $.01 par value per
share...............................   1,266,074 (2)         $3.33   (5)      $4,216,026.42      $1,172.05

Common Stock, $.01 par value per
share...............................      75,000 (3)(4)     $4.648   (6)        $348,600             96.91

Total Registration Fee............................................................................$1,268.96
===========================================================================================================
</TABLE>

(1)      Represents the shares of common stock being registered for resale by
         the selling stockholders.

(2)      Includes 1,266,074 shares of common stock issuable upon conversion of
         500 shares of series D preferred stock and 2,100 shares of series E
         preferred stock. The number of shares of common stock indicated to be
         issuable in connection with such transactions and offered for resale
         hereby is an estimate and is, based on a registration rights agreement
         among Xybernaut Corporation and the selling stockholders, 150% of the
         number of shares that would be issuable upon conversion of 500 shares
         of series D preferred stock and 2,000 shares of the series E preferred
         stock at a price of $4.11 and $2.907 per share, respectively, and is
         subject to adjustment and could be materially less than such estimated
         amount depending upon factors that cannot be predicted by Xybernaut at
         this time, including, among others, the future market price of the
         common stock. If, however, all 500 shares of the series D preferred
         stock and the 2,100 shares of series E preferred stock were converted
         at the closing bid price of the common stock as reported by NASDAQ on
         June 14, 1999 ($3.31), the Company would be obligated to issue a total
         of 785,498 shares of common stock. This presentation is not intended to
         constitute a prediction as to the future market price of the common
         stock or as to the number of shares of common stock into which the
         series D and series E preferred stock will be converted.

(3)      Pursuant to Rule 416, the shares of common stock offered hereby also
         include such presently indeterminate number of shares of common stock
         as shall be issued by Xybernaut to the selling stockholders upon
         exercise the warrants. That number of shares is subject to adjustment
         under anti-dilution provisions included in the warrants. This
         presentation is not intended to constitute a prediction as to the
         future market price of the common stock or as to the number of shares
         of common stock issuable upon exercise of the warrants. See "Risk
         Factors -- Dilution"; and "Description of Securities."

(4)      Pursuant to a registration rights agreement among Xybernaut and the
         selling stockholders, the number of shares represents 150% of the
         number of shares which would be issuable upon exercise of warrants to
         purchase 50,000 shares of common stock.

(5)      Estimated solely for the purpose of calculating the registration fee
         pursuant to Rule 457(c) and (g) of the Securities Act of 1933, as
         amended (the "Securities Act"); based on the average ($3.33) of the bid
         ($3.31) and asked ($3.34) price on the Nasdaq SmallCap Market on June
         14, 1999.

(6)      Estimated solely for the purpose of calculating the registration fee
         pursuant to Rule 457(g) of the Securities Act, based on the higher of
         (a) the exercise price of the warrants or (b) the offering price of
         securities of the same class included in this registration statement.

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE
SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SECTION 8(A), MAY
DETERMINE.

<PAGE>

The information in this prospectus is not complete. We may not sell these
securities until the registration statement filed with the Securities and
Exchange Commission is effective. This prospectus is not an offer to sell nor is
it seeking an offer to buy these securities in any state where the offer or sale
is not permitted.

                   SUBJECT TO COMPLETION, DATED JUNE __, 1999

PROSPECTUS
                                1,341,074 SHARES

                              XYBERNAUT CORPORATION

         The stockholders of Xybernaut Corporation listed on page 10 of this
prospectus are offering for sale 1,341,074 shares of common stock of Xybernaut
under this prospectus.

         The selling stockholders may offer their shares through public or
private transactions, at prevailing market prices, or at privately negotiated
prices. See "Plan of Distribution."


                     --------------------------------------
                     NASDAQ SmallCap Market Symbol: "XYBR"
                     --------------------------------------

         On June 14, 1999, the closing price of one share of our common stock on
the NASDAQ SmallCap Market was $3.31.


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


         THIS INVESTMENT INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD CAREFULLY
         CONSIDER THE FACTORS DESCRIBED UNDER THE CAPTION "RISK FACTORS"
         BEGINNING ON PAGE 2 OF THIS PROSPECTUS.

         NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
         COMMISSION HAS APPROVED OR DISAPPROVED THESE SECURITIES OR DETERMINED
         IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE
         CONTRARY IS A CRIMINAL OFFENSE.


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


             The date of this prospectus is _________________, 1999

<PAGE>

                                  RISK FACTORS

         BEFORE YOU BUY SHARES OF OUR COMMON STOCK, YOU SHOULD BE AWARE THAT
THERE ARE VARIOUS RISKS ASSOCIATED WITH THAT PURCHASE, INCLUDING THOSE DESCRIBED
BELOW. YOU SHOULD CONSIDER CAREFULLY THESE RISK FACTORS, TOGETHER WITH ALL OF
THE OTHER INFORMATION IN THIS PROSPECTUS AND THE DOCUMENTS WE HAVE INCORPORATED
BY REFERENCE IN THE SECTION "WHERE YOU CAN FIND MORE INFORMATION ABOUT US",
BEFORE YOU DECIDE TO PURCHASE SHARES OF OUR COMMON STOCK.


             ------------------------------------------------------
             RISKS ASSOCIATED WITH OUR HISTORY OF LOSSES AND FUTURE
                                NEED FOR CAPITAL
             ------------------------------------------------------

WE HAVE A HISTORY OF LOSSES AND, IF WE DO NOT ACHIEVE PROFITABILITY, WE MAY NOT
BE ABLE TO CONTINUE OUR BUSINESS IN THE FUTURE.

         Our research, development, and general and administrative expenses have
resulted in significant losses and are expected to continue to result in
significant losses for the foreseeable future.
We have incurred the following losses since 1994:


         Fiscal year ended:
             o  March 31, 1994                           $47,352
             o  March 31, 1995                        $1,303,892
             o  December 31, 1996                     $5,238,536
             o  December 31, 1997                     $9,479,966
             o  December 31, 1998                    $13,111,488

        o Three months ended March 31, 1999           $4,221,677

THE "GOING CONCERN" QUALIFICATION ON THE REPORT OF OUR INDEPENDENT ACCOUNTANTS
 MAY REDUCE OUR ABILITY TO RAISE ADDITIONAL FINANCING.

         The report of our independent accountants on our December 31, 1998
consolidated financial statements contains an explanatory paragraph regarding
our ability to continue as a going concern and our ability to meet our ongoing
obligations. Our independent accountants cited our history of operating losses
and our working capital deficit as factors which raised substantial doubt as to
our ability to continue as a going concern. This "going concern" qualification
may reduce our ability to raise additional financing.

WE COULD BE REQUIRED TO CUT BACK OR STOP OPERATIONS IF WE ARE UNABLE TO RAISE OR
OBTAIN NEEDED FINANCING.

         The research, development, commercialization, manufacturing and
marketing of our products will likely require financial resources which are
significantly in excess of those presently available to us. If we are not able
to arrange financing or other third party arrangements on acceptable terms, we
may be unable to fully develop and commercialize any of our products.

                                      - 2 -

<PAGE>


             RISKS ASSOCIATED WITH THE INDUSTRY IN WHICH WE OPERATE

OUR FUTURE REVENUES AND ABILITY TO PRODUCE NEW PRODUCTS DEPEND SUBSTANTIALLY ON
THE SUCCESS OF THE MOBILE ASSISTANT SERIES(R).

         Our Mobile Assistant(R) Series currently consists of one product, the
MA IV. The Mobile Assistant(R) Series is our principal product, and our success
will depend upon its commercial acceptance, which cannot be assured. Additional
product development will result in a significant increase in our research and
development expenses that may be unrecoverable should commercialization of new
products prove unsuccessful. We also could require additional funding if
research and development expenses are greater than we anticipate.

WE MAY HAVE TO LOWER PRICES OR SPEND MORE MONEY TO EFFECTIVELY COMPETE AGAINST
COMPANIES WITH GREATER RESOURCES THAN US WHICH COULD RESULT IN LOWER REVENUES
AND/OR PROFITS.

         The success of our products in the marketplace depends on many factors,
including product performance, price, ease of use, support of industry
standards, and customer support and service. Given these factors we cannot
assure you that we will be able to compete successfully. For example, if our
competitors offer lower prices, we could be forced to lower prices which would
result in reduced margins and a decrease in revenues. If we do not lower prices
we could lose sales and market share. In either case, if we are unable to
compete against our main competitors which include established companies like
Computing Devices International, a division of Ceridian Corporation, ViA Inc.,
Texas Microsystems, Telxon, Norand and Interactive Solutions, Inc., a subsidiary
of Teltronics, Inc., Raytheon and a consortium of Litton and TRW, we would not
be able to generate sufficient revenues to grow the company or reverse our
history of losses.

         In addition, we may have to spend more money to effectively compete for
market share, including funds to expand our infrastructure, which is a capital
and time extensive process. Further, if other companies want to aggressively
compete against us, we may have to spend more money on advertising, promotion,
trade shows, product development, marketing and overhead expenses, hiring and
retaining personnel, and developing new technologies. These higher expenses
would hurt our net income and profits.

CURRENCY FLUCTUATIONS, ESPECIALLY IN THE JAPANESE YEN, MAY SIGNIFICANTLY
INCREASE OUR EXPENSES AND AFFECT OUR RESULTS OF OPERATIONS.

         The exchange rates for some local currencies in countries where we
operate may fluctuate in relation to the U.S. dollar. Such fluctuations may have
an adverse effect on our expenses, earnings or assets when local currencies are
translated into U.S. dollars. We are party to supplier arrangements with several
companies in Japan, including Shimadeu and Sony Digital Products for the
production of the MA IV system. The fees we pay to these companies are paid in
Japanese Yen. Any weakening of the value of the U.S. dollar against the
Japanese Yen could result in an increase in our production expenses which, if
substantial, could have a material adverse effect on our financial condition and
results of operations.

                                      - 3 -

<PAGE>

            ----------------------------------------------------------
            RISKS ASSOCIATED WITH OUR INTERNAL OPERATIONS AND POLICIES
            ----------------------------------------------------------

SINCE WE DO NOT INTEND TO DECLARE DIVIDENDS IN THE FORESEEABLE FUTURE, THE
RETURN ON YOUR INVESTMENT WILL DEPEND UPON APPRECIATION OF THE MARKET PRICE OF
YOUR SHARES.

         We have never paid any dividends on our securities. Our board of
directors does not intend to declare any dividends in the foreseeable future,
but intends to retain all earnings, if any, for use in our business operations.
As a result, the return on your investment in Xybernaut will depend upon any
appreciation in the market price of the common stock. The holders of common
stock are entitled to receive dividends when, as and if declared by the board of
directors out of funds legally available for dividend payments. The payment of
dividends, if any, in the future is within the discretion of our board of
directors and will depend upon our earnings, capital requirements and financial
condition, and other relevant factors.

OUR COMPUTER SYSTEMS MAY NOT RECOGNIZE THE YEAR 2000 WHICH MAY
AFFECT OUR COMPUTER SYSTEMS AND DISRUPT OUR BUSINESS

         The Year 2000 Issue is the result of computer programs being written
using two digits rather than four to define the applicable year. Any of our
computer programs that have date-sensitive software may recognize a date using
"00" as the year 1900 rather than the year 2000. This could result in a system
failure or miscalculations causing disruptions of operations, including, among
other things, a temporary inability to process transactions, send invoices, or
engage in similar normal business activities.

         Based on a recent assessment, we determined that we will be required to
modify or replace portions of our software so that our computer systems will
properly utilize dates beyond December 31, 1999. We believe that we can mitigate
the Year 2000 Issue with modifications to existing software and conversions to
new software. However, if we fail to make such modifications and conversions, or
if we do not make them on a timely basis, the Year 2000 Issue could have a
material impact on our operations.

         We have contacted all of our significant suppliers and large customers
to determine the possible effect on our operations of their inability or failure
to remediate their own Year 2000 Issue. Our estimate of the costs to remediate
our Year 2000 issue is based on presently available information. However, we
cannot guarantee that the systems of other companies on which our systems rely
will be timely converted, or that a failure to convert by another company, or a
conversion that is incompatible with our systems, would not have material
adverse effect on our operations. We have no exposure to contingencies related
to the Year 2000 Issue for the products we have sold.

         We will utilize both internal and external resources to reprogram, or
replace, and test the software for Year 2000 modifications. We plan to complete
the Year 2000 project within the next three months and estimate the total
remaining cost of the Year 2000 project at $6,000. Approximately $1,700 of the
total project cost is attributable to the purchase of new software which will be
capitalized. The remaining $4,300, which will be expensed as incurred over the
next six months, is not expected to have a material effect on our results of
operations. To date, we have incurred and expensed approximately $1,000 related
to our Year 2000 project.

                                      - 4 -

<PAGE>

         Our estimates of the date of completion and cost of our Year 2000
project are based on our best estimates, which we derived utilizing numerous
assumptions of future events including the continued availability of certain
resources, third party modification plans and other factors. The costs and
completion date of our Year 2000 project could differ materially from our
estimates due to the lack of availability and cost of personnel trained in this
area, our ability to locate and correct all relevant computer codes, and similar
uncertainties.

           ------------------------------------------------------------
           RISKS WHICH MAY DILUTE THE VALUE OF YOUR XYBERNAUT SHARES OR
                      LIMIT THE EFFECT OF THEIR VOTING POWER
           -------------------------------------------------------------

THE PRICE OF OUR COMMON STOCK IS HIGHLY VOLATILE.

         The price of our common stock is highly volatile. During the period
from January 1, 1998 to June 14, 1999 the closing price of our common stock has
ranged from a high of $8.44 to a low of $1.38. Following periods of volatility
in the market price of a company's securities, securities class action
litigation has often been instituted against such a company. If similar
litigation were instituted against us, it could result in substantial costs and
a diversion of our management's attention and resources, which could have an
adverse effect on our business. The volatile fluctuations of the market price
are based on (1) the number of shares in the market at the time as well as the
number of shares we may be required to issue in the future, compared to the
market demand for our shares; (2) our performance and meeting expectations of
our performance, including the development and commercialization of our products
and proposed products; and (3) general economic and market conditions.

THE CANCELLATION OF SHARES HELD IN ESCROW MAY RESULT IN A NON-CASH
FUTURE CHARGE WHICH COULD REDUCE OR ELIMINATE EARNINGS PER SHARE.

         As a condition to our initial public offering, certain of our
stockholders, primarily officers and directors, deposited an aggregate of
1,800,000 shares of common stock into an escrow account. The escrowed shares are
subject to release or cancellation on the satisfaction of specific performance
guidelines. See "Effects of Possible Non-Cash Future Charge."

         The difference between the initial offering price and the market value
(at the time of release) of any escrowed shares released will be deemed to be an
additional compensation expense. Such expense, depending on the price per share,
may have the effect of reducing or eliminating any earnings per share and could
have a negative effect on the market price for our common stock.

OUR EXECUTIVE OFFICERS, DIRECTORS AND PRINCIPAL STOCKHOLDERS, TOGETHER, MAY
BE ABLE TO EFFECTIVELY EXERCISE CONTROL OVER ALL MATTERS SUBMITTED TO A VOTE OF
STOCKHOLDERS.

         As June 14, 1999, our executive officers, directors and principal
stockholders beneficially owned, in the aggregate, approximately 27% of our
outstanding shares of common stock. These stockholders, if acting together, may
be able to effectively control most matters requiring approval by our
stockholders. The voting power of these stockholders under certain circumstances
could have the effect of delaying or preventing a change in control of
Xybernaut.

                                      - 5 -

<PAGE>



WE HAVE 14,809,579 SHARES RESERVED FOR FUTURE ISSUANCES
WHICH CAN SUBSTANTIALLY DILUTE THE VALUE OF YOUR XYBERNAUT COMMON STOCK.

         The issuance of reserved shares would dilute the equity interest of
existing stockholders and could have a significant adverse effect on the market
price of our common stock. As of June 14, 1999, we had 14,809,579 shares of
common stock reserved for possible future issuances upon exercise of options and
warrants and registered for possible future issuances upon conversion of
outstanding convertible securities. Certain convertible securities, options and
warrants are convertible into common stock at discounts from future market
prices of the common stock. Such discounts could result in substantial dilution
to existing holders of common stock. The sale of such common stock acquired at a
discount could have a negative impact on the trading price of the common stock
and could increase the volatility in the trading price of the common stock. See
"Dilution."

         In addition, we intend to seek additional financing which may result in
the issuance of additional shares of our capital stock and/or rights to acquire
additional shares of our capital stock. Those additional issuances of capital
would result in a reduction of your percentage interest in Xybernaut.

ANTI-TAKEOVER MEASURES IN OUR CERTIFICATE OF INCORPORATION COULD ADVERSELY
AFFECT THE VOTING POWER OF THE HOLDERS OF THE COMMON STOCK.

         Our Certificate of Incorporation authorizes anti-takeover measures like
the authority to issue "blank check" preferred stock and the staggered Board of
Directors. Those measures could have the effect of delaying, deterring or
preventing a change in control without any action by the shareholders. In
addition, issuance of preferred stock, without shareholder approval, on such
terms as the board of directors may determine, could adversely affect the voting
power of the holders of the common stock, including the loss of voting control
to others. See "Description of Securities."

                INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

         This prospectus contains certain forward-looking statements which
involve substantial risks and uncertainties. These forward-looking statements
can generally be identified because the context of the statement includes words
such as "may," "will," "except," "anticipate," "intend," "estimate," "continue,"
"believe," or other similar words. Similarly, statements that describe our
future plans, objectives and goals are also forward-looking statements. Our
factual results, performance or achievements could differ materially from those
expressed or implied in these forward-looking statements as a result of certain
factors, including those listed in "Risk Factors" and elsewhere in this
Prospectus.

                  WHERE YOU CAN FIND MORE INFORMATION ABOUT US

         We file annual, quarterly and special reports, proxy statements and
other information with the SEC. You may read and copy any document we file at
the SEC's public reference rooms in Washington, D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC- 0330 for further
information on the public reference rooms. Our SEC filings are also available to
the public over the Internet at the SEC's Website at "http://www.sec.gov."

                                      - 6 -

<PAGE>



         We have filed with the SEC a registration statement on Form S-3 to
register the shares being offered. This prospectus is part of that registration
statement and, as permitted by the SEC's rules, does not contain all the
information included in the registration statement. For further information with
respect to us and our common stock, you should refer to the registration
statement and to the exhibits and schedules filed as part of the registration
statement, as well as the documents discussed below.

         The SEC allows us to "incorporate by reference" the information we file
with them, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
an important part of this prospectus, and information that we file later with
the SEC will automatically update or supersede this information.

         This prospectus may contain summaries of contracts or other documents.
Because they are summaries, they will not contain all of the information that
may be important to you. If you would like complete information about a contract
or other document, you should read the copy filed as an exhibit to the
registration statement or incorporated in the registration statement by
reference.

         We incorporate by reference the documents listed below and any future
filings we will make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of
the Securities Exchange Act of 1934 (File No.
0-19041) until all of the shares are sold:

          o       Annual Report on Form 10-KSB for the fiscal year ended
                  December 31, 1998;

          o       Quarterly Report on Form 10-QSB for the period ended March 31,
                  1999; and

          o       The description of our common stock contained in the
                  registration statement on Form 8-A filed on July 15, 1996
                  under the Exchange Act (File No. 0-15086), including all
                  amendments or reports filed for the purpose of updating that
                  description.

         You may request a copy of these filings, at no cost, by writing to us
at 12701 Fair Lakes Circle, Fairfax, Virginia 22033, (703) 631-6925. Attention:
John F. Moynahan.

         You can review and copy the registration statement, its exhibits and
schedules, as well as the documents listed below, at the public reference
facilities maintained by the SEC as described above. The registration statement,
including its exhibits and schedules, are also available on the SEC's web site.

                                 USE OF PROCEEDS

         The selling stockholders are selling all of the shares covered by this
prospectus for their own account. Accordingly, we will not receive any proceeds
from the resale of the shares.

         We will receive proceeds from the exercise, if any, of the warrants. We
will use those proceeds, if any, for working capital and general corporate
purposes.

         We will bear the expenses relating to this registration, other than
discounts and commissions, which will be paid by the selling stockholders.


                                      - 7 -

<PAGE>

                                    DILUTION

         As of June 14, 1999, we had issued and outstanding 22,239,747 shares of
common stock. At that date, there were an additional 14,809,579 shares of common
stock reserved for possible future issuances as follows:

         o        options to purchase 1,947,700 shares at an exercise price
                  between $1.37 and $7.31 per share. The shares underlying these
                  options have not been registered under the Securities Act and
                  will be deemed "restricted securities" when issued;

         o        warrants to purchase 1,177,750 shares at an price between
                  $1.76 and $18.00 per share. We have registered a total of
                  847,750 shares issuable upon exercise of these warrants. The
                  balance of 330,000 will be deemed to be "restricted
                  securities" when issued;

         o        warrants to purchase 5,762,060 shares at an effective exercise
                  price of $6.01 per share. All of the shares issuable upon
                  exercise of these warrants have been registered under the
                  Securities Act; and

         o        525,000 shares issuable upon conversion of 210,000 units. Each
                  unit consists of one share of common stock and one redeemable
                  warrant to purchase one share of common stock, at a price of
                  $9.075 per unit. The unit is exercisable during a period of
                  four years commencing July 18, 1996. The redeemable warrants
                  included in the units are exercisable at $12.60 per share. We
                  have registered the shares issuable upon exercise of the units
                  under the Securities Act.

        o         5,397,069 shares registered for potential conversion of (a)
                  93.75 shares of series C convertible preferred stock, (b)
                  10,500 shares of series D convertible preferred stock, and (c)
                  2,100 shares of series E convertible preferred stock
                  outstanding. The preferred stock is convertible into common
                  stock over time at the discretion of the holders. While the
                  conversion timing, terms, conditions and formulas vary for
                  each issue, if the holders of these preferred stock securities
                  were able to fully convert their shares into common stock on
                  June 14, 1999 and elected to do so, approximately 4,500,000
                  additional shares of common stock would be issued. All of
                  those shares of common stock would be freely tradeable when
                  issued, including 785,498 shares covered by this prospectus.

         During the terms of the outstanding options, redeemable warrants and
the unit purchase option, we must give the holders the opportunity to profit
from a rise in the market price of the common stock. The existence of the
options, the redeemable warrants and the unit purchase option may adversely
affect the terms on which we may obtain additional equity financing. Moreover,
the holders are likely to exercise their rights to acquire common stock at a
time when we would otherwise be able to obtain capital with more favorable terms
than we could obtain through the exercise of such securities.

         The shares which will be deemed "restricted securities" may be sold
under Rule 144. Rule 144 permits sales of "restricted securities" by any person,
whether or not an affiliate of the issuer, after one year. At that time, sales
can be made subject to the Rule's volume and other limitations and after two
years by non-affiliates without adhering to Rule 144's volume or other
limitations. In general, an

                                      - 8 -

<PAGE>



"affiliate" is a person with the power to manage and direct our policies. The
SEC has stated that, generally, executive officers and directors of an entity
are deemed affiliates of the issuing entity.

         Following this offering, assuming the selling stockholders exercise or
convert all of their warrants and convertible securities, we will have
23,580,821 shares of common stock outstanding. Of those shares, approximately
16,445,419 will be freely transferable without restriction under the
Securities Act.

                    EFFECT OF POSSIBLE NON-CASH FUTURE CHARGE

         As a condition to our initial public offering, certain of our
stockholders, primarily officers and directors, deposited an aggregate of
1,800,000 shares of common stock into an escrow account. The Escrowed Shares are
subject to the following terms and conditions:

         o        The Escrowed Shares will be released incrementally over a
                  three-year period only in the event our gross revenues and
                  earnings (loss) per share for the 12-month periods ending
                  September 30, 1997, 1998 and 1999 equal or exceed certain
                  gross revenue and earnings (loss) per share targets.

         o        If such per share targets are not met in any of the relevant
                  12-month periods and the price of the common stock does not
                  meet or exceed agreed upon price levels, certain amounts of
                  the Escrowed Shares will be returned to us for each period and
                  canceled.

         o        All the Escrowed Shares will be released to the stockholders
                  if the closing price of the common stock as reported on The
                  Nasdaq SmallCap Market following this offering equals or
                  exceeds $11.00 for 25 consecutive trading days or 30 out of 35
                  consecutive trading days during the period ending September
                  30, 1999.

         The difference between the initial offering price and the market value
(at the time of release) of any Escrowed Shares released will be deemed to be an
additional compensation expense. Such expense, depending on the price per share,
may have the effect of reducing or eliminating any earnings per share and could
have a negative effect on the market price for our common stock.

         We did not meet the targets for escrow release for September 30, 1997
and September 30, 1998. As a result, 300,000 and 750,000 shares, respectively,
were canceled from the escrow pool resulting in a reduction of 2.1% and 3.6% of
our outstanding shares of common stock at the time of cancellation.

                                      - 9 -

<PAGE>



                              SELLING STOCKHOLDERS

         The following table lists certain information regarding the selling
stockholders' ownership of shares of our common stock as of June 14, 1999, and
as adjusted to reflect the sale of the shares. Information concerning the
selling stockholders, their pledgees, donees and other non-sale transferees who
may become selling stockholders, may change from time to time. To the extent the
selling stockholders or any of their representatives advises us of such changes,
we will report those changes in a prospectus supplement to the extent required.
See "Plan of Distribution."

<TABLE>
<CAPTION>
                                                                                    Shares of Common Stock
                                                                                            Owned
                                                                                        after Offering
                                                                                 ------------------------------
                                         Shares of                Shares of
                                        Common Stock               Common
                                       Owned Prior to            Stock to be
                                        Offering (1)                Sold               Number     Percent
                                      -----------------       -----------------    -----------  -----------

<S>                                      <C>                     <C>                 <C>      <C>
Forest Avenue LLC                          1,106,992(1)            1,106,992(1)        0          *
Settondown Capital  International Ltd.       234,082(2)              234,082(2)        0          *
 Total                                     1,341,074               1,341,074           0
                                           =========               =========           =
</TABLE>

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

* Less than 1%

(1)      Under the terms of a registration statement between Xybernaut and the
         selling stockholder, the number of shares registered for resale by the
         selling stockholder includes 150% of (a) 687,994 common stock issuable
         upon conversion of convertible securities; and (b) warrants to purchase
         50,000 shares of common stock at an exercise price of $4.648 per share.

(2)      Includes 150% of 156,055 shares of common stock issuable upon
         conversion of convertible securities.

         On April 13, 1998, we entered into a financing agreement with Austost
Anstalt Schaan and Balmore Funds S.A. for the sale of $1,000,000 worth of common
stock. Under the terms of that agreement, we had the right, but not the
obligation, to obtain up to an additional $10,000,000 in a series of equity
drawdowns based on terms and conditions specified in the agreement. From April
1998 to January 1999, we exercised equity drawdowns in the amount of $6,360,000
and issued a total of 2,270,938 shares of common stock. The agreement has been
terminated. Settondown Capital International Ltd. acted as placement agent for
those transactions. Wayne Coleson, a director of Settondown Capital
International, Ltd., is a member of our advisory board.

         Other than as indicated above, the selling stockholders are not
affiliated with us.



                                     - 10 -

<PAGE>



                            DESCRIPTION OF SECURITIES

GENERAL

         Our authorized capital stock consists of 40,000,000 shares of common
stock, par value $.01 per share, and 6,000,000 shares of preferred stock, par
value $.01 per share. As of the date of this prospectus, we have 22,239,747
shares of common stock, 93.75 shares of series C preferred stock, 10,500 shares
of series D preferred stock and 2,100 shares of series E preferred stock issued
and outstanding. We have reserved 13,912,510 shares of common stock for issuance
upon conversion of the preferred stock and outstanding options and warrants.

COMMON STOCK

         VOTING

         The holders of our common stock are entitled to one vote for each share
held of record on all matters submitted to a vote of stockholders. Our
Certificate of Incorporation and By-Laws do not provide for cumulative voting
rights in the election of directors. Accordingly, holders of a majority of the
shares of common stock entitled to vote in any election of directors may elect
all of the directors standing for election.

         DIVIDENDS

         Holders of common stock are entitled to receive ratably such dividends
as may be declared by the Board of Directors out of funds legally available for
that purpose.

         RIGHTS ON LIQUIDATION

         In the event of our liquidation, dissolution or winding up, holders of
common stock are entitled to share ratably in the assets remaining after payment
of liabilities.

         PRE-EMPTIVE OR REDEMPTION RIGHTS

         Holders of common stock have no preemptive, conversion or redemption
rights. All of the outstanding shares of common stock are fully-paid and
nonassessable.

PREFERRED STOCK

         The Board of Directors has the authority to issue up to 6,000,000
shares of preferred stock. The Board may issue the preferred stock from time to
time in one or more series. The Board has the authority to establish the number
of shares to be included in each series, and to fix the designations, powers,
preferences and rights of the shares of each series and the applicable
qualifications, limitations or restrictions. The issuance of preferred stock may
have the effect of delaying or preventing a change in control. The issuance of
preferred stock could decrease the amount of earnings and assets available for
distribution to the holders of common stock, if any, or could adversely affect
the rights and powers, including voting rights, of the holders of the common
stock. In certain circumstances, such issuances could have the effect of
decreasing the market price of the common stock.

                                     - 11 -

<PAGE>



         As of the date of this prospectus, we have not designated any shares of
preferred stock other than the series A, B, C, D and E preferred stock. The
series A and B preferred stock have been fully converted. There are no other
shares of preferred stock outstanding, and we have no plans to issue any other
shares of preferred stock.

WARRANTS

         Of the total 1,341,074 shares of common stock registered for sale by
the selling stockholders, 50,000 shares are issuable upon exercise of currently
exercisable warrants. Due to the terms of the registration rights agreement
between Xybernaut and the selling stockholder, this prospectus covers the sale
of 75,000 shares of common stock issuable upon exercise of the warrant. The
75,000 shares represent 150% of the original number of shares issuable under the
warrant. The warrants were issued to one of the selling stockholders in
connection with a private placement. The exercise price and term of the warrant
are as follows:

     ------------------------------------------------------------------
     Warrants            Exercise Price                 Expiration Date
     ------------------------------------------------------------------

      50,000                   $ 4.648                    May 11, 2002

         The exercise price and the number of shares for which each warrant is
exercisable is subject to adjustment under anti-dilution provisions pertaining
to the declaration of stock dividends and the merger, consolidation or
liquidation of the Company.

ANTI-TAKEOVER CONSIDERATIONS.

         Our Certificate of Incorporation authorizes the issuance of up to
6,000,000 shares of $.01 par value preferred stock. The issuance of preferred
stock with such rights could have the effect of limiting stockholder
participation in certain transactions such as mergers or tender offers and could
discourage or prevent a change in our management. We have no present intention
to issue any additional preferred stock.

         We have a classified or staggered Board of Directors which limits an
outsider's ability to effect a rapid change of control of the Board. In
addition, at the 1998 Annual Meeting of Stockholders held on September 24, 1998,
our shareholders approved measures to amend our Certificate of Incorporation and
By-laws, where applicable, to:

         o        implement an advance notice procedure for the submission of
                  director nominations and other business to be considered at
                  annual meetings of stockholders;

         o        permit only the President, the Vice Chairmen of the Board, the
                  Secretary or the Board of Directors to call special meetings
                  of stockholders and to limit the business permitted to be
                  conducted at such meetings to be brought before the meetings
                  by or at the direction of the Board of Directors;

         o        provide that a member of the Board of Directors may only be
                  removed for cause by an affirmative vote of holders of at
                  least 66 2/3% of the voting power of the then

                                     - 12 -

<PAGE>



                  outstanding shares entitled to vote generally in the election
                  of directors voting together as a single class;

         o        fix the size of the Board of Directors at a maximum of twelve
                  directors, with the authorized number of directors set at ten,
                  and the Board of Directors having the sole power and authority
                  to increase or decrease the number of directors acting by an
                  affirmative vote of at least a majority of the total number of
                  authorized directors most recently fixed by the Board of
                  Directors;

         o        provide that any vacancy on the Board may be filled for the
                  unexpired term (or for a new term in the case of an increase
                  in the size of the board) only by an affirmative vote of at
                  least a majority of the remaining directors then in office
                  even if less than a quorum, or by the sole remaining director;

         o        eliminate stockholder action by written consent;

         o        require the approval of holders of 80% of the then outstanding
                  voting stock and/or the approval of 66 2/3% of the directors
                  for certain corporate transactions; and

         o        require an affirmative vote of 66 2/3% of the voting stock in
                  order to amend or repeal any adopted amendments to the
                  Certificate of Incorporation and Bylaws adopted at the
                  meeting.

         Those measures, combined with the ability of the Board of Directors to
issue "blank check" preferred stock and the staggered Board of Directors, could
have the effect of delaying, deterring or preventing a change in control without
any further action by the shareholders. In addition, the issuance of preferred
stock, without shareholder approval, on such terms as the Board of Directors may
determine, could adversely affect the voting power of the holders of the common
stock, including the loss of voting control to others.

TRANSFER AGENT AND REGISTRAR

         Continental Stock Transfer & Trust Company is our Transfer Agent and
Registrar for our common stock and the redeemable warrants.


                              PLAN OF DISTRIBUTION

         The selling stockholders and their pledgees, donees, transferees and
other subsequent owners, may offer their shares at various times in one or more
of the following transactions:

         o         in the over-the-counter market; or
         o         in privately negotiated transactions

at prevailing market prices at the time of sale, at prices related to those
prevailing market prices, at negotiated prices or at fixed prices.


                                     - 13 -

<PAGE>

         The selling stockholders may also sell the shares under Rule 144
instead of under this prospectus, if Rule 144 is available for those sales.

         The transactions in the shares covered by this prospectus may be
effected by one or more of the following methods:

         o        ordinary brokerage transactions and transactions in which the
                  broker solicits purchasers;
         o        purchases by a broker or dealer as principal, and the resale
                  by that broker or dealer for its account under this
                  prospectus, including resale to another broker or dealer;
         o        block trades in which the broker or dealer will attempt to
                  sell the shares as agent but may position and resell a portion
                  of the block as principal in order to facilitate the
                  transaction; or
         o        negotiated transactions between selling stockholders and
                  purchasers without a broker or dealer.

         The selling stockholders and any broker-dealers or other persons acting
on the behalf of parties that participate in the distribution of the shares may
be deemed to be underwriters. Any commissions or profits they receive on the
resale of the shares may be deemed to be underwriting discounts and commissions
under the Securities Act.

         As of the date of this prospectus, we are not aware of any agreement,
arrangement or understanding between any broker or dealer and any of the selling
stockholders with respect to the offer or sale of the shares under this
prospectus.

         We have advised the selling stockholders that during the time each is
engaged in distributing shares covered by this prospectus, each must comply with
the requirements of the Securities Act and Rule 10b-5 and Regulation M under the
Exchange Act. Under those rules and regulations, they:

         o may not engage in any stabilization activity in connection with our
           securities;
         o must furnish each broker which offers common stock covered by this
           prospectus with the number of copies of this prospectus which are
           required by each broker; and
         o may not bid for or purchase any of our securities or attempt to
           induce any person to purchase any of our securities other than as
           permitted under the Exchange Act.

         In the purchase agreements and warrants we executed in connection with
the transactions with the selling stockholders we agreed to indemnify and hold
harmless each selling stockholder against liabilities under the Securities Act,
which may be based upon, among other things, any untrue statement or alleged
untrue statement of a material fact or any omission or alleged omission of a
material fact, unless made or omitted in reliance upon written information
provided to us by that selling stockholder. We have agreed to bear the expenses
incident to the registration of the shares, other than selling discounts and
commissions.

                                     - 14 -

<PAGE>



                 INDEMNIFICATION FOR SECURITIES ACT LIABILITIES

         Section 145 of the Delaware General Corporation Law allows companies to
indemnify their directors and officers against expenses, judgments, fines and
amounts paid in settlement under the conditions and limitations described in the
law. Our certificate of incorporation authorizes us to indemnify our officers,
directors and other agent to the fullest extent permitted under Delaware law.

         Our certificate of incorporation provides that a director is not
personally liable for monetary damages to us or our stockholders for breach of
his or her fiduciary duties as a director. A director will be held liable for a
breach of his or her duty of loyalty to us or our stockholders, his or her
intentional misconduct or willful violation of law, actions or in actions not in
good faith, an unlawful stock purchase or payment of a dividend under Delaware
law, or transactions from which the director derives an improper personal
benefit. This limitation of liability does not affect the availability of
equitable remedies against the director including injunctive relief or
rescission.

         We have purchased a directors and officers liability and reimbursement
policy that covers liabilities of our directors and officers arising out of
claims based upon acts or omissions in their capacities as directors and
officers.

        Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to our directors, officers and controlling persons pursuant
to the foregoing provisions, or otherwise, we have been advised that in the
opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable.


                                     - 15 -

<PAGE>



                                  LEGAL MATTERS

        Parker Chapin Flattau & Klimpl, LLP, New York, New York will pass upon
the validity of the securities offered hereby. Martin Eric Weisberg, Esq., a
member of the firm, is our Secretary and one of our Directors.

                                     EXPERTS

        The consolidated financial statements incorporated in this Prospectus by
reference to the Annual Report on Form 10-KSB for the year ended December 31,
1998, have been so incorporated in reliance on the report (which contains an
explanatory paragraph relating to the Company's ability to continue as a going
concern as described in Note 1 to the consolidated financial statements) of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.


                                     - 16 -

<PAGE>

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

        WE HAVE NOT AUTHORIZED ANY DEALER,
SALESPERSON OR ANY OTHER PERSON TO GIVE ANY             1,341,074
INFORMATION OR TO REPRESENT ANYTHING NOT        SHARES OF COMMON STOCK
CONTAINED IN THIS PROSPECTUS.  YOU MUST NOT
RELY ON ANY UNAUTHORIZED INFORMATION. THIS
PROSPECTUS DOES NOT OFFER TO SELL OR BUY
ANY SHARES IN ANY JURISDICTION WHERE IT
IS UNLAWFUL.  THE INFORMATION IN THIS
PROSPECTUS IS CURRENT AS OF
_________________, 1999.


          TABLE OF CONTENTS
                                  Page
                                  ----

Risk Factors........................2
Where You Can Find More
                                              -------------------------
        Information About Us........6                PROSPECTUS
Use of Proceeds.....................7         -------------------------
Dilution............................8
Effects of Possible Non-Cash
        Future Charge...............9
Selling Stockholders ..............10
Description of Securities..........12
Plan of Distribution ..............14             _______________________, 1999
Indemnification for Securities
        Act Liabilities............16
Legal Matters......................17
Experts ...........................17


=====================================       ====================================
<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

         The following table sets forth the various expenses which will be paid
by Xybernaut in connection with the issuance and distribution of the securities
being registered on this Registration Statement. The selling stockholders will
not incur any of the expenses set forth below. All amounts shown are estimates.

        Filing fee for registration statement...............     $1,269.00
        Legal fees and expenses.............................    $10,000.00
        Accounting expenses.................................     $5,000.00
                                                                ----------
             Total..........................................    $16,269.00
                                                                ==========

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Section 145 of the General Corporation Law of the State of Delaware
(the "DGCL") provides, in general, that a corporation incorporated under the
laws of the State of Delaware, such as the registrant, may indemnify any person
who was or is a party or is threatened to be made a party to any threatened,
pending or completed action, suit or proceeding (other than a derivative action
by or in the right of the corporation) by reason of the fact that such person is
or was a director, officer, employee or agent of the corporation, or is or was
serving at the request of the corporation as a director, officer, employee or
agent of another enterprise, against expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred
by such person in connection with such action, suit or proceeding if such person
acted in good faith and in a manner such person reasonably believed to be in or
not opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, had no reasonable cause to believe such person's
conduct was unlawful. In the case of a derivative action, a Delaware corporation
may indemnify any such person against expenses (including attorneys' fees)
actually and reasonably incurred by such person in connection with the defense
or settlement of such action or suit if such person acted in good faith and in a
manner such person reasonably believed to be in or not opposed to the best
interests of the corporation, except that no indemnification shall be made in
respect of any claim, issue or matter as to which such person shall have been
adjudged to be liable to the corporation unless and only to the extent that the
Court of Chancery of the State of Delaware or any other court in which such
action was brought determines such person is fairly and reasonably entitled to
indemnity for such expenses.

         Xybernaut's Certificate of Incorporation provides that directors shall
not be personally liable for monetary damages to Xybernaut or its stockholders
for breach of fiduciary duty as a director, except for liability resulting from
a breach of the director's duty of loyalty to Xybernaut or its stockholders,
intentional misconduct or wilful violation of law, actions or inactions not in
good faith, an unlawful stock purchase or payment of a dividend under Delaware
law, or transactions from which the director derives improper personal benefit.
Such limitation of liability does not affect the availability of equitable
remedies such as injunctive relief or rescission. Xybernaut's Certificate of
Incorporation also authorizes Xybernaut to indemnify its officers, directors and
other agents, by bylaws, agreements or otherwise, to the fullest extent
permitted under Delaware law. Xybernaut has entered into an

                                      II-1

<PAGE>



Indemnification Agreement (the "Indemnification Agreement") with each of its
directors and officers which may, in some cases, be broader than the specific
indemnification provisions contained in Xybernaut's Certificate of Incorporation
or as otherwise permitted under Delaware law. Each Indemnification Agreement may
require Xybernaut, among other things, to indemnify such officers and directors
against certain liabilities that may arise by reason of their status or service
as a director or officer, against liabilities arising from willful misconduct of
a culpable nature, and to obtain directors' and officers' liability insurance if
available on reasonable terms.

         Xybernaut maintains a directors and officers liability policy with
Genesis Insurance Company that contains a limit of liability of $3,000,000 per
policy year.

ITEM 16.  EXHIBITS.

NUMBER             DESCRIPTION OF EXHIBIT

3.1       Certificate of Designation of the Series D Preferred Stock.
3.2       Certificate of Designation of the Series D Preferred Stock., as
          amended May 12, 1999.
3.3       Certificate of Designation of the Series E Preferred Stock.
3.4       Certificate of Designation of the Series E Preferred Stock, as amended
          May 12, 1999.
4.1       Form of Securities Purchase Agreement used in the May 11, 1999 private
          placement.
4.2       Form of Warrant used in the May 11, 1999 private placement.
5         Opinion of Parker Chapin Flattau & Klimpl, LLP.
10.1      Form of Registration Rights Agreement used in the May 11, 1999 private
          placement.
10.2      Form of Escrow Agreement used in the May 11, 1999 private placement.
23.1      Consent of PricewaterhouseCoopers LLP
23.2      Consent of Parker Chapin Flattau & Klimpl, LLP (included in their
          opinion filed as Exhibit 5).
24.1      Power of Attorney (included on page II-4).
- --------

ITEM 17.  UNDERTAKINGS.

         The undersigned registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this registration statement;

                  (i) To include any prospectus required by Section 10(a)(3) of
         the Securities Act of 1933;

                  (ii) To reflect in the prospectus any facts or events arising
         after the effective date of the registration statement (or the most
         recent post-effective amendment thereof) which, individually or in the
         aggregate, represent a fundamental change in the information set forth
         in the registration statement. Notwithstanding the foregoing, any
         increase or decrease in volume of securities offered (if the total
         dollar value of securities offered would not exceed that which was
         registered) and any deviation from the low or high and of the estimated
         maximum offering range may be reflected in the form of prospectus filed
         with the Commission pursuant to Rule

                                      II-2

<PAGE>



         424(b) if, in the aggregate, the changes in volume and price represent
         no more than 20 percent change in the maximum aggregate offering price
         set forth in the "Calculation of Registration Fee" table in the
         effective registration statement.

                  (iii) To include any material information with respect to the
         plan of distribution not previously disclosed in the registration
         statement or any material change to such information in the
         registration statement;

         (2) That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 (the "Act") may be permitted to directors, officers and controlling
persons of the small business issuer pursuant to the foregoing provisions, or
otherwise, the small business issuer has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Act and is, therefore, unenforceable.

         In the event that a claim for indemnification against such liabilities
(other than the payment by the small business issuer of expenses incurred or
paid by a director, officer or controlling person of the small business issuer
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the small business issuer will, unless in the opinion of its counsel
the matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of the issue.

         The undersigned small business issuer hereby undertakes that, for
purposes of determining any liability under the Securities Act of 1933, each
filing of the registrant's annual report pursuant to section 13(a) or section
15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing
of an employee benefit plan's annual report pursuant to section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

                                      II-3

<PAGE>



                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Fairfax, Commonwealth of Virginia on June 16, 1999.

                                        XYBERNAUT CORPORATION


                                        By: /s/ Edward G. Newman
                                            ------------------------------------
                                            Edward G. Newman
                                            Chairman of the Board, President
                                            and Chief Executive Officer



                                POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS, that each individual whose signature
appears below constitutes Edward G. Newman and Steven A. Newman, each acting
alone, his true and lawful attorney-in-fact and agent, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign any and all amendments (including post-effective
amendments) to this registration statement and to file the same with exhibits
thereto, and all documents in connection therewith, with the Securities and
Exchange Commission, granting unto said attorneys-in-fact and agents, and each
of them, full power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or their
or his substitute or substitutes, may lawfully do or cause to be done by virtue
hereof.

         Pursuant to the requirements of the Securities Act of 1933, this
registration statement on Form S-3 has been signed below by the following
persons in the capacities and on the date indicated.


         SIGNATURE                   TITLE                         DATE
         ---------                   -----                         ----

                               Chairman of the Board,
                               President and Chief Executive      June 16, 1999
/s/ Edward G. Newman           Officer
- -----------------------------
Edward G. Newman


/s/ Kaz Toyosato               Executive Vice President -         June 16, 1999
- -----------------------------  Asian Operations and Director
Kaz Toyosato

                                      II-4

<PAGE>

        SIGNATURE                   TITLE                         DATE
        ---------                   -----                         ----


/s/ John F. Moynahan           Chief Operating Officer and   June 16, 1999
- -----------------------------  Chief Financial Officer
John F. Moynahan

/s/ Martin Eric Weisberg
- -----------------------------  Secretary and Director        June 16, 1999
Martin Eric Weisberg

/s/ Lt. Gen. Harry E. Soyster
- -----------------------------  Director                      June 16, 1999
Lt. Gen. Harry E. Soyster

/s/ James J. Ralabate
- -----------------------------  Director                      June 16, 1999
James J. Ralabate

/s/ Keith P. Hicks
- -----------------------------  Director                      June 16, 1999
Keith P. Hicks

/s/ Steven A. Newman
- -----------------------------  Vice Chairman and             June 16, 1999
Steven A. Newman               Director

/s/ Phillip E. Pearce
- -----------------------------  Director                      June 16, 1999
Phillip E. Pearce

/s/ Eugene J. Amobi
- -----------------------------  Director                      June 16, 1999
Eugene J. Amobi

/s/ Edwin Vogt
- -----------------------------  Director                      June 16, 1999
Edwin Vogt


                                      II-5



<PAGE>

                                 SECURITIES AND
                                    EXCHANGE
                                   COMMISSION

                             WASHINGTON, D.C. 20549


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




                              EXHIBITS TO FORM S-3

                             REGISTRATION STATEMENT

                                      UNDER

                           THE SECURITIES ACT OF 1933


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







                              XYBERNAUT CORPORATION
                       (EXACT NAME OF ISSUER AS SPECIFIED
                                 IN ITS CHARTER)



                                  JUNE 14, 1999

<PAGE>



                                  EXHIBIT INDEX



EXHIBIT NO.     DESCRIPTION OF DOCUMENT
- -----------     -----------------------

3.1             Certificate of Designation of the Series D Preferred Stock.
3.2             Certificate of Designation of the Series D Preferred Stock., as
                amended May 12, 1999.
3.3             Certificate of Designation of the Series E Preferred Stock.
3.4             Certificate of Designation of the Series E Preferred Stock, as
                amended May 12, 1999.
4.1             Form of Securities Purchase Agreement used in the May 11, 1999
                private placement.
4.2             Form of Warrant used in the May 11, 1999 private placement.
5               Opinion of Parker Chapin Flattau & Klimpl, LLP.
10.1            Form of Registration Rights Agreement used in the May 11, 1999
                private placement.
10.2            Form of Escrow Agreement used in the May 11, 1999 private
                placement.
23.1            Consent of PricewaterhouseCoopers LLP
23.2            Consent of Parker Chapin Flattau & Klimpl, LLP (included
                in their opinion filed as Exhibit 5).
24.1            Power of Attorney (included on page II-4).


                                       E-2




                                                                     EXHIBIT 3.1
                                                                     -----------

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

                           CERTIFICATE OF DESIGNATION
                                       OF
                              XYBERNAUT CORPORATION

                     Pursuant to Section 151 of the General
                    Corporation Law of the State of Delaware

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

                            SERIES D PREFERRED STOCK

         Xybernaut Corporation, a Delaware corporation (the "Corporation"),
hereby certifies that the following resolution has been duly adopted by the
Board of Directors of the Corporation:

                  RESOLVED, that pursuant to the authority expressly granted to
         and vested in the Board of Directors of the Corporation by the
         provisions of the Certificate of Incorporation of the Corporation (the
         "Certificate of Incorporation"), there hereby is created, out of the
         6,000,000 shares of Preferred Stock, par value $0.01 per share, of the
         Corporation authorized in Article Fourth of the Certificate of
         Incorporation (the "Preferred Stock"), a series of the Preferred Stock
         of the Corporation consisting of 10,000 shares, which series shall have
         the following powers, designations, preferences and relative,
         participating, optional and other rights, and the following
         qualifications, limitations and restrictions:

1.       DESIGNATION AND AMOUNT. This series of Preferred Stock shall be
         designated "Series D Preferred Stock" and the authorized number of
         shares constituting such series shall be 10,000. The par value of the
         Series D Preferred Stock shall be $0.01 per share. The Series D
         Preferred Stock shall have a stated value of $1,000 per share.

2.       DIVIDENDS.

                  a. The holders of shares of Series D Preferred Stock shall be
         entitled to receive, out of any assets at the time legally available
         therefor and when and as declared by the Board of Directors, dividends
         at the rate of five percent (5%) of the stated Liquidation Preference
         (as defined below) per share per annum, and no more, payable, in the
         discretion of the Board of Directors of the Corporation in shares of
         the common stock of the Corporation, par value $0.01 per share (the
         "Common Stock"), or in cash. Such dividends on the Series D Preferred
         Stock shall be payable only at conversion of the Series D Preferred
         Stock into shares of Common Stock. Such dividends on the Series D
         Preferred Stock are prior and in preference to any declaration or
         payment of any distribution (as defined below) on any outstanding
         shares of Common Stock or any other equity securities of the
         Corporation ranking junior to the Series D Preferred Stock as to the
         payment of dividends. Such dividends shall accrue on each share of
         Series D Preferred Stock from day to day from the date of initial
         issuance thereof whether or not earned or declared so that if such
         dividends with respect to any previous dividend period at the rate
         provided for herein have not

                                       E-3

<PAGE>



         been paid on, or declared and set apart for, all shares of Series D
         Preferred Stock at the time outstanding, the deficiency shall be fully
         paid on, or declared and set apart for, such shares on a pro rata basis
         with all other equity securities of the Corporation ranking on a parity
         with the Series D Preferred Stock as to the payment of dividends before
         any distribution shall be paid on, or declared and set apart for Common
         Stock or any other equity securities of the Corporation ranking junior
         to the Series D Preferred Stock as to the payment of dividends.

                  b. For purposes hereof, unless the context otherwise requires,
         "distribution" shall mean the transfer of cash or property without
         consideration, whether by way of dividend or otherwise, payable other
         than in shares of Common Stock or other equity securities of the
         Company, or the purchase or redemption of shares of the Corporation
         (other than redemptions set forth in Paragraph 5 below or repurchases
         of Common Stock held by employees or consultants of the Corporation
         upon termination of their employment or services pursuant to agreements
         providing for such repurchase) for cash or property.

3.       PREFERENCES ON LIQUIDATION.

                  a. In the event of any voluntary or involuntary liquidation,
         dissolution, or winding up of the Corporation, the holders of shares of
         the Series D Preferred Stock then outstanding, shall be entitled to be
         paid, out of the assets of the Corporation available for distribution
         to its stockholders, whether from capital, surplus or earnings, before
         any payment shall be made in respect of the Corporation's Common Stock,
         an amount equal to the sum of one thousand dollars ($1,000.00) per
         share of Series D Preferred Stock (the "Liquidation Preference"), plus
         all accrued and unpaid dividends thereon to the date of payment.

                  b. If upon liquidation, dissolution, or winding up of the
         Corporation, the assets of the Corporation available for distribution
         to its stockholders shall be insufficient to pay the holders of the
         Series D Preferred Stock the full Liquidation Preference plus accrued
         and unpaid dividends to which they respectively shall be entitled, the
         holders of the Series D Preferred Stock together with the holders of
         any other series of Preferred Stock ranking on a parity with the Series
         D Preferred Stock as to the payments of amounts upon liquidation,
         dissolution or winding up shall share ratably in any distribution of
         assets according to the respective amounts which would be payable in
         respect of all such shares held by the respective stockholders thereof
         upon such distribution if all amounts payable on or with respect to
         said shares were paid in full.

                  c. For purposes of this Paragraph 2, the sale or other
         disposition (for cash, shares of stock, securities or other
         consideration), of all or substantially all of the assets of the
         Corporation shall be deemed to be a liquidation, dissolution or winding
         up of the Corporation but the merger or consolidation of the
         Corporation into or with another corporation into or with the
         Corporation, shall not be deemed to be a liquidation, winding up or
         dissolution of the Corporation.

                  d. The holders of Series D Preferred Stock shall have no
         priority or preference with respect to distributions made by the
         Corporation in connection with the repurchase of shares of Common Stock
         issued to or held by employees, directors or consultants upon
         termination of their employment or services pursuant to agreements
         providing for the right of said repurchase between the Corporation and
         such persons.

                                       E-4

<PAGE>



4.       CONVERSION RIGHTS.

                  The holders of Series D Preferred Stock shall have conversion
rights as follows:

                  a. At any time on or after the earlier of: (i) the effective
         date of the registration statement or (ii) on the one hundred
         twenty-first (121st) day after the date of issuance of the first
         tranche of Series D Preferred Stock, up to thirty percent (30%) of the
         shares of Series D Preferred Stock issuable to each of the holders
         thereof may be converted, at the option of the holders thereof. On or
         after each of the two subsequent thirty (30) day periods immediately
         thereafter (the "Initial Periods"), an additional thirty percent (30%)
         of the shares of Series D Preferred Stock issuable to each of the
         holders thereof may be converted, on a cumulative and pro rata basis,
         at the option of the holders thereof. On or after the thirty (30) day
         period following the Initial Periods, an additional ten percent (10%)
         of the shares of Series D Preferred Stock issuable to each of the
         holders thereof may be converted, on a cumulative and pro rata basis,
         at the option of the holders thereof. The number of shares of fully
         paid and nonassessable Common Stock into which each share of Series D
         Preferred Stock may be converted shall be determined by dividing the
         Liquidation Preference by the Conversion Price (as hereinafter defined)
         in effect on the Conversion Date.

                  b. For purposes of this Paragraph 4, (i) "Conversion Price"
         means an amount equal to the lesser of (a) 100 percent (100%) of the
         closing bid price of the Common Stock as reported by Bloomberg L.P. on
         the trading day immediately preceding the Tranche I Closing Date (as
         such term is defined in the Securities Purchase Agreement dated as of
         March 8, 1998 (the "Securities Purchase Agreement")), or (b) 100
         percent (100%) of the "Market Price," where "Market Price" is defined
         as the average of the three (3) lowest closing bid prices, not
         necessarily consecutive, of the Common Stock during the twenty (20) day
         trading period immediately preceding the Conversion Date; and (ii)
         "Conversion Date" means the date on which the holder of the Series D
         Preferred Stock has telecopied the Notice of Conversion (as hereinafter
         defined) to the Corporation, which date shall not be prior to the
         earlier of: (a) the effective date of the registration statement or (b)
         on the one hundred twenty-first (121st) day after the date of issuance
         of the first tranche of Series D Preferred Stock.

                  c. A holder may convert in whole or in part, the Series D
         Preferred Stock into Common Stock held by such holder by telecopying an
         executed and completed Notice of Conversion in the form annexed hereto
         as Exhibit A (a "Notice of Conversion") to the Corporation (at Fax
         Number 703-222-7660 Attention: Steven Newman and Jeffrey Pagano) to the
         Corporation and delivering the original Notice of Conversion and the
         certificate representing the shares of Series D Preferred Stock to the
         Corporation by express courier within five (5) business days after the
         date of the Notice of Conversion. Each date on which a Notice of
         Conversion is telecopied to and received by the Corporation in
         accordance with the provisions hereof shall be deemed a Conversion
         Date. The Corporation will transmit the certificates representing the
         Common Stock issuable upon conversion of all or any part of the shares
         of Series D Preferred Stock (together with the certificate representing
         portions of the shares of Series D Preferred Stock not so converted) to
         the holder via express courier within five (5) business days after the
         Corporation has received the original Notice of Conversion and shares
         certificate being so converted. The Notice of Conversion and
         certificate representing the portion of the shares of Series D
         Preferred Stock converted shall

                                       E-5

<PAGE>



         be delivered to the Corporation at its principal executive offices or
         to such other person at such other place as the Corporation designates
         to the holder in writing.

                  d. No fractional shares of Common Stock shall be issued upon
         conversion of the Series D Preferred Stock. In lieu of any fractional
         shares to which the holder would otherwise be entitled, the Corporation
         shall pay cash equal to such fraction multiplied by the fair market
         value of the Common Stock on the Conversion Date, as determined by the
         Corporation's Board of Directors. The Corporation shall not be
         obligated to issue certificates evidencing the shares of Common Stock
         issuable upon conversion unless either the certificates evidencing such
         shares of Series D Preferred Stock are delivered to the Corporation or
         its transfer agent as provided above, or the holder notifies the
         Corporation or its transfer agent that such certificates have been
         lost, stolen or destroyed and executes an agreement satisfactory to the
         Corporation to indemnify the Corporation from any loss incurred by it
         in connection with such certificates.

                  e. Subject to subparagraph (c) above, the Corporation shall
         issue and deliver at such office to such holder of Series D Preferred
         Stock, a certificate or certificates for the number of shares of Common
         Stock to which the holder shall be entitled as aforesaid and a check
         payable to the holder, or order, in the amount of any cash amounts
         payable as the result of a conversion into fractional shares of Common
         Stock, plus any accrued and unpaid dividends on the converted Series D
         Preferred Stock, and a certificate for any shares of Series D Preferred
         Stock not so converted.

                  f. Upon any conversion of Series D Preferred Stock pursuant to
         this Paragraph 4 the shares of Series D Preferred Stock which are
         converted shall not be reissued and shall not be considered outstanding
         for any purposes. Upon conversion of all of the then outstanding Series
         D Preferred Stock pursuant to this Paragraph 4 and upon the taking of
         any action required by law, all matters set forth in this Certificate
         of Designation shall be eliminated from the Certificate of
         Incorporation, shares of Series D Preferred Stock shall not be deemed
         outstanding for any purpose whatsoever and all such shares shall be
         retired and canceled and shall not be reissued.

                  g. Any transmittal or other communications required by the
         provisions of Paragraphs 4 and 5(a) to be given to the holders of
         shares of Series D Preferred Stock shall be deemed effectively given
         (i) on the date delivered, if transmitted by facsimile (with a machine
         generated confirmation) or (ii) five business days after deposit in the
         United States mail, first class, postage prepaid and addressed to each
         holder of record at its address, on the next business day, if sent by a
         recognized international courier (with all costs prepaid), in the
         manner set forth in the Securities Purchase Agreement, with all
         required copies set forth therein.

                  h. Subject to the Exchange Cap (as defined below), each share
         of Series D Preferred Stock which remains outstanding on the second
         anniversary of the date of issuance of the first tranche of Series D
         Preferred Stock shall automatically be converted on such date into
         shares of Common Stock.

                  i. The Corporation shall at all times when any shares of
         Series D Preferred Stock shall be outstanding, reserve and keep
         available out of its authorized but unissued stock, such number of
         shares of Common Stock as shall from time to time be sufficient to
         effect the conversion of all outstanding shares of Series D Preferred
         Stock.

                                       E-6

<PAGE>



                  j. The Corporation shall not be obligated to issue upon
         conversion of the Series D Preferred Stock, in the aggregate, shares of
         Common Stock equal to more than 19.99% of the Common Stock outstanding
         on the date of issuance of the Series D Preferred Stock (such amount to
         be proportionately and equitably adjusted from time to time in the
         event of stock splits, stock dividends, combinations, reverse stock
         splits, reclassification, capital reorganizations and similar events
         relating to the Common Stock) (the "Exchange Cap") if issuance of a
         larger number of shares of Common Stock would constitute a breach of
         the Company's obligations under the rules or regulations of The Nasdaq
         Stock Market, Inc. ("Nasdaq") or any other principal securities
         exchange or market upon which the Common Stock is or becomes traded. If
         the conversion of any shares of Series D Preferred Stock would result
         in the issuance of shares of Common Stock which in the aggregate will
         equal or exceed the Exchange Cap, the Corporation shall within ten (10)
         days of such conversion request (x) call a meeting of its stockholders
         in order to seek approval as required by the applicable rules or
         regulations of Nasdaq for issuances of Common Stock in excess of the
         Exchange Cap, which stockholders meeting shall take place within
         seventy-five (75) days of such conversion request, and (y) file a proxy
         statement in order to seek approval of the stockholders of the
         Corporation as required by the applicable rules or regulations of
         Nasdaq for issuances of Common Stock in excess of the Exchange Cap. The
         Corporation shall comply with all applicable rules and regulation of
         the Securities Act of 1933, as amended (the "Securities Act"), the
         Securities Exchange Act of 1934, as amended (the "Exchange Act"), and
         Nasdaq, as applicable, at the expense of the Corporation. If the
         Corporation obtains the approval of stockholders as required under the
         rules or regulations of Nasdaq, the Corporation shall be obligated to
         issue upon conversion of the Series D Preferred Stock, in the
         aggregate, shares of Common Stock in excess of the Exchange Cap. If the
         Corporation does not obtain the approval of stockholders as required
         under the rules or regulations of Nasdaq or fails to call the
         stockholders meeting within the time herein, the Corporation shall be
         in default hereunder and the holders shall have all their rights and
         remedies.

                  k. Notwithstanding the foregoing provisions, in no event
         (except with respect to an automatic conversion of the Series D
         Preferred Stock as provided in Paragraph 4(h) above) shall holders of
         Series D Preferred Stock be entitled to convert any shares of Preferred
         Stock to the extent after such conversion, the sum of (1) the number of
         shares of Common Stock beneficially owned by the holders of Series D
         Preferred Stock and their affiliates (other than shares of Common Stock
         which may be deemed beneficially owned through the ownership of the
         unconverted portion of the Series D Preferred Stock and the unexercised
         portion of any Warrants), and (2) the number of shares of Common Stock
         issuable upon the conversion of the Series D Preferred Stock and
         exercise of the Warrants with respect to which the determination of
         this proviso is being made, would result in beneficial ownership by the
         holders and their affiliates of more than 4.99% of the outstanding
         shares of Common Stock. For purposes of the proviso to the immediately
         preceding sentence, beneficial ownership shall be determined in
         accordance with Section 13(d) of the Exchange Act, except as otherwise
         provided in clause (1) of such proviso. The preceding shall not
         interfere with any Series D Preferred Stock holder's right to convert
         the Series D Preferred Stock or exercise the Warrants which in the
         aggregate total more than 4.99% of the outstanding shares of Common
         Stock, over time, as long as no single holder of Series D Preferred
         Stock owns more than 4.99% of the outstanding Common Stock at any given
         time.


                                       E-7

<PAGE>



5.       REDEMPTION.

                  a. The Corporation may, at the option of the Board of
         Directors, redeem all or a portion of the outstanding shares of the
         Series D Preferred Stock upon five (5) business days prior written
         notice to the holders of the Series D Preferred Stock (the "Redemption
         Notice") at the redemption price set forth in subparagraph (b) below.
         The Corporation may not serve a Redemption Notice unless it has
         immediately available funds for a minimum of the amount it intends to
         redeem in a bank account controlled by the Corporation. The Redemption
         Notice shall be given in accordance with Paragraph 4(g) above. Such
         notice shall state the date of redemption (the "Redemption Date"), the
         Redemption Price (as hereinafter defined), the number of shares of
         Series D Preferred Stock of such holders to be redeemed and shall call
         upon such holders to surrender to the Corporation on the Redemption
         Date at the place designated in the notice such holders' redeemed
         stock. The Redemption Date shall be no more than five (5) business days
         after receipt of written notice from the Corporation. If the
         Corporation fails to pay the Redemption Price by the sixth trading day
         following the Redemption Date, the redemption will be declared null and
         void and the Corporation shall lose its right to serve a Redemption
         Notice in the future. On or after the Redemption Date, the holders of
         shares of Series D Preferred Stock called for redemption shall
         surrender the certificates evidencing the shares called for redemption
         to the Corporation at the place designated in such notice and shall
         thereupon be entitled to receive payment of the Redemption Price.
         Subject to the notice requirement of the immediately following
         sentence, the holder of Series D Preferred Stock shall be allowed to
         convert up to a maximum of twenty percent (20%) of the total amount of
         Series D Preferred Stock issuable to such holder. If the holder elects
         to convert the Series D Preferred Stock after receipt of the Redemption
         Notice, the Corporation must receive such conversion within three (3)
         business days from the time the Redemption Notice is received by the
         holder.

                  b. Subject to the terms of Paragraph 5(a) above, the Company
         shall have the option to redeem all or a portion of all the outstanding
         shares of Series D Preferred Stock at a cash price equal to:

                           (i)      if the redemption occurs within 60 days
                                    after the date of issuance of the first
                                    tranche of Series D Preferred Stock, 108% of
                                    the Liquidation Preference plus any accrued
                                    but unpaid dividends;

                           (ii)     if the redemption occurs between 61 and 120
                                    days after the date of issuance of the first
                                    tranche of Series D Preferred Stock, 112% of
                                    the Liquidation Preference plus any accrued
                                    but unpaid dividends; or

                           (iii)    if the redemption occurs 121 days or more
                                    after the date of issuance of the first
                                    tranche of Series D Preferred Stock, 115% of
                                    the Liquidation Preference plus any accrued
                                    but unpaid dividends (the "Redemption
                                    Price").

                  c. From and after the Redemption Date (unless default shall be
         made by the Corporation in duly paying the Redemption Price in which
         case all the rights of the holders of such

                                       E-8

<PAGE>



         shares shall continue), the holders of the shares of the Series D
         Preferred Stock called for redemption shall cease to have any rights as
         stockholders of the Corporation, except the right to receive, without
         interest, the Redemption Price thereof upon surrender of certificates
         representing the shares of Series D Preferred Stock, and such shares
         shall not thereafter be transferred (except with the consent of the
         Corporation) on the books of the Corporation and shall not be deemed
         outstanding for any purpose whatsoever.

                  d. There shall be no redemption of any shares of Series D
         Preferred Stock of the Corporation where such action would be in
         violation of applicable law.

6.       VOTING RIGHTS.

                  Except as otherwise required by law, the holders of the Series
         D Preferred Stock shall not be entitled to vote upon any matter
         relating to the business or affairs of the Corporation or for any other
         purpose.

7.       STATUS.

                  In case any outstanding shares of Series D Preferred Stock
         shall be redeemed, the shares so redeemed shall be deemed to be
         permanently canceled and shall not resume the status of authorized but
         unissued shares of Series D Preferred Stock.

8.       RANKING; CHANGES AFFECTING SERIES D.

                  a. The Series D Preferred Stock shall, with respect to
         dividend rights and rights on liquidation, winding up and dissolution,
         (i) rank senior to any of the Corporation's Common Stock and any other
         class or series of stock of the Company which by its terms shall rank
         junior to the Series D Preferred Stock, and (ii) rank junior to any
         other class or series of stock of the Company which by its terms shall
         rank senior to the Series D Preferred Stock and (iii) shall rank on a
         pari passu basis with any other series of Preferred Stock of the
         Corporation.

                  (b) So long as any shares of Series D Preferred Stock are
         outstanding, the Corporation shall not (i) alter or change any of the
         powers preferences, privileges, or rights of the Series D Preferred
         Stock; or (ii) amend the provisions of this Paragraph 8, in each case,
         without first obtaining the approval by vote or written consent, in the
         manner provided by law, of the holders of at least a majority of the
         outstanding shares of Series D Preferred Stock, as to changes affecting
         the Series D Preferred Stock.



                                  [end of page]


                                       E-9

<PAGE>



         IN WITNESS WHEREOF, the Corporation has caused this Certificate of
Designation to be signed by its President this 8th day of March, 1999.



                                        /s/ Edward G. Newman
                                        ----------------------------------------
                                            Edward G. Newman, President



                                      E-10

<PAGE>
                                                                       EXHIBIT A




                              NOTICE OF CONVERSION

                (To be Executed by the Registered Holder in order
                    to Convert the Series D Preferred Stock)


         The undersigned hereby irrevocably elects to convert ___ shares of
Series D Preferred Stock, Certificate No. ___ (the "Preferred Stock") into
shares of common stock of XYBERNAUT CORPORATION (the "Company") according to the
conditions hereof, as of the date written below.

The undersigned represents and warrants that

         (i)      All offers and sales by the undersigned of the shares of
                  Common Stock issuable to the undersigned upon conversion of
                  the Preferred Stock shall be made in compliance with
                  Regulation D, pursuant to an exemption from registration under
                  the Securities Act, or pursuant to registration of the Common
                  Stock under the Act, subject to any restrictions on sale or
                  transfer set forth in the Securities Purchase Agreement
                  between the Company and the original holder of the Certificate
                  submitted herewith for conversion.

         (ii)     Upon conversion pursuant to this Notice of Conversion, the
                  undersigned will not own or be deemed to beneficially own
                  4.99% or more of the then issued and outstanding shares of the
                  Company as provided in the Certificate for the Preferred
                  Stock.


         ____________________________        ______________________________
         Date of Conversion                  Applicable Conversion Price

         ____________________________        ______________________________
         Number of Common Shares upon        $ Amount of Conversion
         Conversion

         ____________________________        ______________________________
         Signature                            Name


    Address:                                 Delivery of Shares to:



                                      E-11



                                                                     EXHIBIT 3.2
                                                                     -----------


                     ---------------------------------------
                           CERTIFICATE OF AMENDMENT
                                       OF
                           CERTIFICATE OF DESIGNATION
                            (SERIES D PREFERRED STOCK)
                                       OF
                              XYBERNAUT CORPORATION

                     Pursuant to Section 151 of the General
                    Corporation Law of the State of Delaware

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

It is hereby certified that:

         1. The name of the corporation (hereinafter called the "Corporation")
is Xybernaut Corporation.

         2. The Certificate of Designation (Series D Preferred Stock) of the
Corporation was filed with the Secretary of State of Delaware on March 8, 1999.

         3. The Certificate of Designation (Series D Preferred Stock) of the
Corporation is hereby amended by deleting the resolution adopted by the Board of
Directors of the Corporation and Paragraph 1 thereof and by substituting in lieu
thereof the following (i) new resolution adopted by the Board of Directors of
the Corporation to increase the number of shares of Series D Preferred Stock
from "10,000" to "10,500" and (ii) new Paragraph 1:

         A. "RESOLVED, that pursuant to the authority expressly granted to and
vested in the Board of Directors of the Corporation by the provisions of the
Certificate of Incorporation of the Corporation (the "Certificate of
Incorporation"), there hereby is created, out of the 6,000,000 shares of
Preferred Stock, par value $0.01 per share, of the Corporation authorized in
Article Fourth of the Certificate of Incorporation (the "Preferred Stock"), a
series of the Preferred Stock of the Corporation consisting of 10,500 shares,
which series shall have the following powers, designations, preferences and
relative, participating, optional and other rights, and the following
qualifications, limitations and restrictions:"

         B. "1. Designation and Amount. This series of Preferred Stock shall be
designated "Series D Preferred Stock" and the authorized number of shares
constituting such series shall be 10,500. The par value of the Series D
Preferred Stock shall be $0.01 per share. The Series D Preferred Stock shall
have a stated value of $1,000 per share."

         4. The amendment to the Certificate of Designation (Series D Preferred
Stock) herein certified has been duly adopted in accordance with the provisions
of Section 151(g) of the General Corporation Law of the State of Delaware.

Signed on May 12, 1999.

                                       Xybernaut Corporation

                                       By:/s/Edward G. Newman
                                          -------------------------------
                                             Edward G. Newman, President


                                      E-12


                                                                     EXHIBIT 3.3
                                                                     -----------


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

                           CERTIFICATE OF DESIGNATION
                                       OF
                              XYBERNAUT CORPORATION

                     Pursuant to Section 151 of the General
                    Corporation Law of the State of Delaware

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

                            SERIES E PREFERRED STOCK

         Xybernaut Corporation, a Delaware corporation (the "Corporation"),
hereby certifies that the following resolution has been duly adopted by the
Board of Directors of the Corporation:

                  RESOLVED, that pursuant to the authority expressly granted to
         and vested in the Board of Directors of the Corporation by the
         provisions of the Certificate of Incorporation of the Corporation (the
         "Certificate of Incorporation"), there hereby is created, out of the
         6,000,000 shares of Preferred Stock, par value $0.01 per share, of the
         Corporation authorized in Article Fourth of the Certificate of
         Incorporation (the "Preferred Stock"), a series of the Preferred Stock
         of the Corporation consisting of 2,000 shares, which series shall have
         the following powers, designations, preferences and relative,
         participating, optional and other rights, and the following
         qualifications, limitations and restrictions:

1.       DESIGNATION AND AMOUNT. This series of Preferred Stock shall be
         designated "Series E Preferred Stock" and the authorized number of
         shares constituting such series shall be 2,000. The par value of the
         Series E Preferred Stock shall be $0.01 per share. The Series E
         Preferred Stock shall have a stated value of $1,000 per share.

2.       DIVIDENDS.

                  a. The holders of shares of Series E Preferred Stock shall be
         entitled to receive, out of any assets at the time legally available
         therefor and when and as declared by the Board of Directors, dividends
         at the rate of five percent (5%) of the stated Liquidation Preference
         (as defined below) per share per annum, and no more, payable, in the
         discretion of the Board of Directors of the Corporation in shares of
         the common stock of the Corporation, par value $0.01 per share (the
         "Common Stock"), or in cash. Such dividends on the Series E Preferred
         Stock shall be payable only at conversion of the Series E Preferred
         Stock into shares of Common Stock. Such dividends on the Series E
         Preferred Stock are prior and in preference to any declaration or
         payment of any distribution (as defined below) on any outstanding
         shares of Common Stock or any other equity securities of the
         Corporation ranking junior to the Series E Preferred Stock as to the
         payment of dividends. Such dividends shall accrue on each share of
         Series E Preferred Stock from day to day from the date of initial
         issuance thereof whether or not earned or declared so that if such
         dividends with respect to any previous dividend period at the rate
         provided for herein have not been paid on, or declared and set apart
         for, all shares of Series E Preferred Stock at the time outstanding,
         the

                                      E-13

<PAGE>



         deficiency shall be fully paid on, or declared and set apart for, such
         shares on a pro rata basis with all other equity securities of the
         Corporation ranking on a parity with the Series E Preferred Stock as to
         the payment of dividends before any distribution shall be paid on, or
         declared and set apart for Common Stock or any other equity securities
         of the Corporation ranking junior to the Series E Preferred Stock as to
         the payment of dividends.

                  b. For purposes hereof, unless the context otherwise requires,
         "distribution" shall mean the transfer of cash or property without
         consideration, whether by way of dividend or otherwise, payable other
         than in shares of Common Stock or other equity securities of the
         Corporation, or the purchase or redemption of shares of the Corporation
         (other than redemptions set forth in Paragraph 5 below or repurchases
         of Common Stock held by employees or consultants of the Corporation
         upon termination of their employment or services pursuant to agreements
         providing for such repurchase) for cash or property.

3.       PREFERENCES ON LIQUIDATION.

                  a. In the event of any voluntary or involuntary liquidation,
         dissolution, or winding up of the Corporation, the holders of shares of
         the Series E Preferred Stock then outstanding, shall be entitled to be
         paid, out of the assets of the Corporation available for distribution
         to its stockholders, whether from capital, surplus or earnings, before
         any payment shall be made in respect of the Corporation's Common Stock,
         an amount equal to the sum of one thousand dollars ($1,000.00) per
         share of Series E Preferred Stock (the "Liquidation Preference"), plus
         all accrued and unpaid dividends thereon to the date of payment.

                  b. If upon liquidation, dissolution, or winding up of the
         Corporation, the assets of the Corporation available for distribution
         to its stockholders shall be insufficient to pay the holders of the
         Series E Preferred Stock the full Liquidation Preference plus accrued
         and unpaid dividends to which they respectively shall be entitled, the
         holders of the Series E Preferred Stock together with the holders of
         any other series of Preferred Stock ranking on a parity with the Series
         E Preferred Stock as to the payments of amounts upon liquidation,
         dissolution or winding up shall share ratably in any distribution of
         assets according to the respective amounts which would be payable in
         respect of all such shares held by the respective stockholders thereof
         upon such distribution if all amounts payable on or with respect to
         said shares were paid in full.

                  c. For purposes of this Paragraph 2, the sale or other
         disposition (for cash, shares of stock, securities or other
         consideration), of all or substantially all of the assets of the
         Corporation shall be deemed to be a liquidation, dissolution or winding
         up of the Corporation but the merger or consolidation of the
         Corporation into or with another corporation into or with the
         Corporation, shall not be deemed to be a liquidation, winding up or
         dissolution of the Corporation.

                  d. The holders of Series E Preferred Stock shall have no
         priority or preference with respect to distributions made by the
         Corporation in connection with the repurchase of shares of Common Stock
         issued to or held by employees, directors or consultants upon
         termination of their employment or services pursuant to agreements
         providing for the right of said repurchase between the Corporation and
         such persons.


                                      E-14

<PAGE>



4.       CONVERSION RIGHTS.

                  The holders of Series E Preferred Stock shall have conversion
rights as follows:

                  a. No shares of Series E Preferred Stock may be converted
         prior to the earlier of (i) the effective date of the registration
         statement covering the shares of Common Stock issuable upon conversion
         of the Series E Preferred Stock, and (ii) on the one hundred
         twenty-first (121st) day after the Closing Date (as hereinafter
         defined) (the "First Conversion Date"). During the thirty-day period
         following the First Conversion Date, up to twenty-five (25%) percent of
         the shares of Series E Preferred Stock then outstanding may be
         converted, at the option of the holders thereof, and during each
         thirty-day period thereafter, an additional twenty-five (25%) percent
         of the shares of Series E Preferred Stock issued on the Closing Date
         may be converted, on a cumulative (by taking into account the number of
         unconverted shares of Preferred Stock which were permitted to be
         converted during the prior thirty-day periods) and pro rata basis, at
         the option of the holders thereof. Notwithstanding the foregoing, if
         the trading volume of the Common Stock for the two weeks prior to the
         First Conversion Date equals or exceeds 150,000, during each thirty day
         period following the First Conversion Date up to thirty-three percent
         (33%) of the Series E Preferred Stock may be converted, on a cumulative
         and pro rata basis, at the option of the holders thereof. The number of
         shares of fully paid and nonassessable Common Stock into which each
         share of Series E Preferred Stock may be converted shall be determined
         by dividing the Liquidation Preference by the Conversion Price (as
         hereinafter defined) in effect on the Conversion Date (as hereinafter
         defined).

                  b. For purposes of this Paragraph 4, (i) "Conversion Price"
         means an amount equal to the lesser of (a) one hundred percent (100%)
         of the closing bid price of the Common Stock as reported by Bloomberg
         L.P. on the trading day immediately preceding the Closing Date (as such
         term is defined in the Securities Purchase Agreement dated as of May
         11, 1999 (the "Securities Purchase Agreement")), or (b) ninety-four
         percent (94%) of the "Market Price," where "Market Price" is defined as
         the average of the three (3) lowest closing bid prices, not necessarily
         consecutive, of the Common Stock during the twenty (20) day trading
         period immediately preceding the Conversion Date; and (ii) "Conversion
         Date" means the date on which the holder of the Series E Preferred
         Stock has telecopied the Notice of Conversion (as hereinafter defined)
         to the Corporation, which date shall not be prior to the earlier of:
         (a) the effective date of the registration statement or (b) on the one
         hundred twenty-first (121st) day after the Closing Date.

                  c. A holder may convert in whole or in part, the Series E
         Preferred Stock into Common Stock held by such holder by telecopying an
         executed and completed Notice of Conversion in the form annexed hereto
         as Exhibit A (a "Notice of Conversion") to the Corporation (at Fax
         Number 703-222-7660 Attention: Steven Newman and Jeffrey Pagano) to the
         Corporation and delivering the original Notice of Conversion and the
         certificate representing the shares of Series E Preferred Stock to the
         Corporation by express courier within five (5) business days after the
         date of the Notice of Conversion. Each date on which a Notice of
         Conversion is telecopied to and received by the Corporation in
         accordance with the provisions hereof shall be deemed a Conversion
         Date. The Corporation will transmit the certificates representing the
         Common Stock issuable upon conversion of all or any part of the shares
         of Series E Preferred Stock (together with the certificate representing
         portions of the shares of Series E Preferred Stock not so converted) to
         the holder via express courier within five (5) business days after the
         Corporation has received the original Notice


                                      E-15

<PAGE>



         of Conversion and shares certificate being so converted. The Notice of
         Conversion and certificate representing the portion of the shares of
         Series E Preferred Stock converted shall be delivered to the
         Corporation at its principal executive offices or to such other person
         at such other place as the Corporation designates to the holder in
         writing.

                  d. No fractional shares of Common Stock shall be issued upon
         conversion of the Series E Preferred Stock. In lieu of any fractional
         shares to which the holder would otherwise be entitled, the Corporation
         shall pay cash equal to such fraction multiplied by the fair market
         value of the Common Stock on the Conversion Date, as determined by the
         Corporation's Board of Directors. The Corporation shall not be
         obligated to issue certificates evidencing the shares of Common Stock
         issuable upon conversion unless either the certificates evidencing such
         shares of Series E Preferred Stock are delivered to the Corporation or
         its transfer agent as provided above, or the holder notifies the
         Corporation or its transfer agent that such certificates have been
         lost, stolen or destroyed and executes an agreement satisfactory to the
         Corporation to indemnify the Corporation from any loss incurred by it
         in connection with such certificates.

                  e. Subject to subparagraph (c) above, the Corporation shall
         issue and deliver at such office to such holder of Series E Preferred
         Stock, a certificate or certificates for the number of shares of Common
         Stock to which the holder shall be entitled as aforesaid and a check
         payable to the holder, or order, in the amount of any cash amounts
         payable as the result of a conversion into fractional shares of Common
         Stock, plus any accrued and unpaid dividends on the converted Series E
         Preferred Stock, and a certificate for any shares of Series E Preferred
         Stock not so converted.

                  f. Upon any conversion of Series E Preferred Stock pursuant to
         this Paragraph 4 the shares of Series E Preferred Stock which are
         converted shall not be reissued and shall not be considered outstanding
         for any purposes. Upon conversion of all of the then outstanding Series
         E Preferred Stock pursuant to this Paragraph 4 and upon the taking of
         any action required by law, all matters set forth in this Certificate
         of Designation shall be eliminated from the Certificate of
         Incorporation, shares of Series E Preferred Stock shall not be deemed
         outstanding for any purpose whatsoever and all such shares shall be
         retired and canceled and shall not be reissued.

                  g. Any transmittal or other communications required by the
         provisions of Paragraphs 4 and 5(a) to be given to the holders of
         shares of Series E Preferred Stock shall be deemed effectively given
         (i) on the date delivered, if transmitted by facsimile (with a machine
         generated confirmation) or (ii) five business days after deposit in the
         United States mail, first class, postage prepaid and addressed to each
         holder of record at its address, on the next business day, if sent by a
         recognized international courier (with all costs prepaid), in the
         manner set forth in the Securities Purchase Agreement, with all
         required copies set forth therein.

                  h. Subject to the Exchange Cap (as defined below), each share
         of Series E Preferred Stock which remains outstanding on the second
         anniversary of the Closing Date shall automatically be converted on
         such date into shares of Common Stock.

                  i. The Corporation shall at all times when any shares of
         Series E Preferred Stock shall be outstanding, reserve and keep
         available out of its authorized but unissued stock, such number of
         shares of Common Stock as shall from time to time be sufficient to
         effect the conversion of all outstanding shares of Series E Preferred
         Stock.

                                      E-16

<PAGE>



                  j. The Corporation shall not be obligated to issue upon
         conversion of the Series E Preferred Stock, in the aggregate, shares of
         Common Stock equal to more than 19.99% of the Common Stock outstanding
         on the date of issuance of the Series E Preferred Stock (such amount to
         be proportionately and equitably adjusted from time to time in the
         event of stock splits, stock dividends, combinations, reverse stock
         splits, reclassification, capital reorganizations and similar events
         relating to the Common Stock) (the "Exchange Cap") if issuance of a
         larger number of shares of Common Stock would constitute a breach of
         the Corporation's obligations under the rules or regulations of The
         Nasdaq Stock Market, Inc. ("Nasdaq") or any other principal securities
         exchange or market upon which the Common Stock is or becomes traded. If
         the conversion of any shares of Series E Preferred Stock would result
         in the issuance of shares of Common Stock which in the aggregate will
         equal or exceed the Exchange Cap, the Corporation shall within sixty
         (60) days from the Closing Date file a proxy statement in order to seek
         approval of the stockholders of the Corporation as required by the
         applicable rules or regulations of Nasdaq for issuances of Common Stock
         in excess of the Exchange Cap. The Corporation shall comply with all
         applicable rules and regulation of the Securities Act of 1933, as
         amended (the "Securities Act"), the Securities Exchange Act of 1934, as
         amended (the "Exchange Act"), and Nasdaq, as applicable, at the expense
         of the Corporation. If the Corporation obtains the approval of
         stockholders as required under the rules or regulations of Nasdaq, the
         Corporation shall be obligated to issue upon conversion of the Series E
         Preferred Stock, in the aggregate, shares of Common Stock in excess of
         the Exchange Cap. If the Corporation does not obtain the approval of
         stockholders as required under the rules or regulations of Nasdaq or
         fails to call the stockholders meeting within the time herein, each
         holder of Series E Preferred Stock shall have the right, at such
         holder's option, to require the Corporation to redeem, subject to the
         terms of Paragraph 4(k) below, all or a portion of such holder's shares
         of Series E Preferred Stock which the Corporation is unable to convert
         (the "Mandatory Redemption"), at a price per share equal to 115% of the
         Liquidation Preference, plus any accrued but unpaid dividends
         ("Mandatory Redemption Price").

                  k. Upon receipt of a Notice of Conversion from a holder of
         Series E Preferred Stock which cannot be fully satisfied, the
         Corporation shall immediately notify via facsimile to such holder of
         Series E Preferred Stock of the Corporation's inability to fully
         satisfy such holder's Notice of Conversion (the "Inability to Fully
         Convert Notice"). The Inability to Fully Convert Notice shall indicate
         the number of shares of Series E Preferred Stock which cannot be
         converted and the Mandatory Redemption Price. Such holder shall notify
         the Corporation within five (5) business days of receipt of the
         Inability to Fully Convert Notice of its election to cause a Mandatory
         Redemption by delivering written notice via facsimile to the
         Corporation ("Notice in Response to Inability to Convert"). If such
         holder shall elect to have its shares redeemed pursuant to Paragraph
         4(j) above, the Corporation shall pay the Mandatory Redemption Price in
         cash to such holder within five (5) business days after the
         Corporation's receipt of the holders Notice in Response to Inability to
         Convert, provided that prior to the Corporation's receipt of the
         holder's Notice in Response to Inability to Convert, the Corporation
         has not delivered a notice to such holder stating that the event or
         condition triggering the Mandatory Redemption has been cured. From and
         after the date of the Mandatory Redemption (unless the Corporation
         shall default in duly paying the Redemption Price in which case all the
         rights of the holders of such shares shall continue), the holders of
         the shares of the Series E Preferred Stock so redeemed shall cease to
         have any rights as stockholders of the Corporation, except the right to
         receive, without interest, the Mandatory Redemption Price thereof upon
         surrender of certificates representing the shares of Series E Preferred
         Stock, and such shares shall not thereafter be transferred (except with
         the consent of the


                                      E-17

<PAGE>



         Corporation) on the books of the Corporation and shall not be deemed
         outstanding for any purpose whatsoever.

                  l. Notwithstanding the foregoing provisions, in no event
         (except with respect to an automatic conversion of the Series E
         Preferred Stock as provided in Paragraph 4(h) above) shall holders of
         Series E Preferred Stock be entitled to convert any shares of Preferred
         Stock to the extent after such conversion, the sum of (1) the number of
         shares of Common Stock beneficially owned by the holders of Series E
         Preferred Stock and their affiliates (other than shares of Common Stock
         which may be deemed beneficially owned through the ownership of the
         unconverted portion of the Series E Preferred Stock and the unexercised
         portion of any Warrants), and (2) the number of shares of Common Stock
         issuable upon the conversion of the Series E Preferred Stock and
         exercise of the Warrants with respect to which the determination of
         this proviso is being made, would result in beneficial ownership by the
         holders and their affiliates of more than 4.99% of the outstanding
         shares of Common Stock. For purposes of the proviso to the immediately
         preceding sentence, beneficial ownership shall be determined in
         accordance with Section 13(d) of the Exchange Act, except as otherwise
         provided in clause (1) of such proviso. The preceding shall not
         interfere with any Series E Preferred Stock holder's right to convert
         the Series E Preferred Stock or exercise the Warrants which in the
         aggregate total more than 4.99% of the outstanding shares of Common
         Stock, over time, as long as no single holder of Series E Preferred
         Stock owns more than 4.99% of the outstanding Common Stock at any given
         time.

5.       REDEMPTION.

                  a. The Corporation may, at the option of the Board of
         Directors, redeem all or a portion of the outstanding shares of the
         Series E Preferred Stock upon five (5) business days prior written
         notice to the holders of the Series E Preferred Stock (the "Redemption
         Notice") at the redemption price set forth in subparagraph (b) below,
         provided, that the closing bid price of the Common Stock is greater
         than $5.00 per share. The Corporation may not serve a Redemption Notice
         unless it has immediately available funds for a minimum of the amount
         it intends to redeem in a bank account controlled by the Corporation.
         The Redemption Notice shall be given in accordance with Paragraph 4(g)
         above. Such notice shall state the date of redemption (the "Redemption
         Date"), the Redemption Price (as hereinafter defined), the number of
         shares of Series E Preferred Stock of such holders to be redeemed (the
         "Redemption Amount") and shall call upon such holders to surrender to
         the Corporation on the Redemption Date at the place designated in the
         notice such holders' redeemed stock. The Redemption Date shall be no
         more than five (5) business days after receipt of written notice from
         the Corporation. If the Corporation fails to pay the Redemption Price
         by the sixth trading day following the Redemption Date, the redemption
         will be declared null and void and the Corporation shall lose its right
         to serve a Redemption Notice in the future. On or after the Redemption
         Date, the holders of shares of Series E Preferred Stock called for
         redemption shall surrender the certificates evidencing the shares
         called for redemption to the Corporation at the place designated in
         such notice and shall thereupon be entitled to receive payment of the
         Redemption Price. Subject to the notice requirement of the immediately
         following sentence, the holder of Series E Preferred Stock shall be
         allowed to convert up to a maximum of twenty percent (20%) of the
         Redemption Amount. If the holder elects to convert the Series E
         Preferred Stock after receipt of the Redemption Notice, the Corporation
         must receive such conversion within twenty-four (24) hours from the
         time the Redemption Notice is received by the holder.

                                      E-18

<PAGE>



                  b. Subject to the terms of Paragraph 5(a) above, the
         Corporation shall have the option to redeem all or a portion of all the
         outstanding shares of Series E Preferred Stock at a cash price equal
         to:

                      (i)   if the redemption occurs within 60 days after the
                            date of issuance of the Series E Preferred Stock,
                            108% of the Liquidation Preference plus any accrued
                            but unpaid dividends;

                      (ii)  if the redemption occurs between 61 and 120 days
                            after the date of issuance of the Series E Preferred
                            Stock, 112% of the Liquidation Preference plus any
                            accrued but unpaid dividends; or

                      (iii) if the redemption occurs 121 days or more
                            after the date of issuance of the Series E
                            Preferred Stock, 115% of the Liquidation
                            Preference plus any accrued but unpaid
                            dividends (the "Redemption Price").

                  c. From and after the Redemption Date (unless default shall be
         made by the Corporation in duly paying the Redemption Price in which
         case all the rights of the holders of such shares shall continue), the
         holders of the shares of the Series E Preferred Stock called for
         redemption shall cease to have any rights as stockholders of the
         Corporation, except the right to receive, without interest, the
         Redemption Price thereof upon surrender of certificates representing
         the shares of Series E Preferred Stock, and such shares shall not
         thereafter be transferred (except with the consent of the Corporation)
         on the books of the Corporation and shall not be deemed outstanding for
         any purpose whatsoever.

                  d. There shall be no redemption of any shares of Series E
         Preferred Stock of the Corporation where such action would be in
         violation of applicable law.

6.       VOTING RIGHTS.

                  Except as otherwise required by law, the holders of the Series
         E Preferred Stock shall not be entitled to vote upon any matter
         relating to the business or affairs of the Corporation or for any other
         purpose.

7.       STATUS.

                  In case any outstanding shares of Series E Preferred Stock
         shall be redeemed, the shares so redeemed shall be deemed to be
         permanently canceled and shall not resume the status of authorized but
         unissued shares of Series E Preferred Stock.

8.       RANKING; CHANGES AFFECTING SERIES E.

                  a. The Series E Preferred Stock shall, with respect to
         dividend rights and rights on liquidation, winding up and dissolution,
         (i) rank senior to any of the Corporation's Common Stock and any other
         class or series of stock of the Corporation which by its terms shall
         rank junior to the Series E Preferred Stock, and (ii) rank junior to
         any other class or series of stock of the Corporation


                                      E-19

<PAGE>



         which by its terms shall rank senior to the Series E Preferred Stock
         and (iii) shall rank on a pari passu basis with any other series of
         Preferred Stock of the Corporation.

                  (b) So long as any shares of Series E Preferred Stock are
         outstanding, the Corporation shall not (i) alter or change any of the
         powers preferences, privileges, or rights of the Series E Preferred
         Stock; or (ii) amend the provisions of this Paragraph 8, in each case,
         without first obtaining the approval by vote or written consent, in the
         manner provided by law, of the holders of at least a majority of the
         outstanding shares of Series E Preferred Stock, as to changes affecting
         the Series E Preferred Stock.

         IN WITNESS WHEREOF, the Corporation has caused this Certificate of
Designation to be signed by its President this 11th day of May, 1999.



                                       /s/ Edward G. Newman
                                       -------------------------------
                                           Edward G. Newman, President



                                      E-20

<PAGE>
                                                                       EXHIBIT A

                              NOTICE OF CONVERSION

                (To be Executed by the Registered Holder in order
                    to Convert the Series E Preferred Stock)


         The undersigned hereby irrevocably elects to convert ___ shares of
Series E Preferred Stock, Certificate No. ___ (the "Preferred Stock") into
shares of common stock of XYBERNAUT CORPORATION (the "Company") according to the
conditions hereof, as of the date written below.

The undersigned represents and warrants that

         (i)      All offers and sales by the undersigned of the shares of
                  Common Stock issuable to the undersigned upon conversion of
                  the Preferred Stock shall be made in compliance with
                  Regulation D, pursuant to an exemption from registration under
                  the Securities Act, or pursuant to registration of the Common
                  Stock under the Act, subject to any restrictions on sale or
                  transfer set forth in the Securities Purchase Agreement
                  between the Company and the original holder of the Certificate
                  submitted herewith for conversion.

         (ii)     Upon conversion pursuant to this Notice of Conversion, the
                  undersigned will not own or be deemed to beneficially own
                  4.99% or more of the then issued and outstanding shares of the
                  Company as provided in the Certificate for the Preferred
                  Stock.


         _____________________________        _________________________________
         Date of Conversion                    Applicable Conversion Price

         _____________________________        _________________________________
         Number of Common Shares upon          $ Amount of Conversion
         Conversion

         _________________________________    _________________________________
         Signature                             Name


Address:                                       Delivery of Shares to:


                                      E-21


                                                                    EXHIBIT 3.4
                                                                    -----------


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

                            CERTIFICATE OF AMENDMENT
                                       OF
                           CERTIFICATE OF DESIGNATION
                           (SERIES E PREFERRED STOCK)
                                       OF
                              XYBERNAUT CORPORATION

                     Pursuant to Section 151 of the General
                    Corporation Law of the State of Delaware

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


It is hereby certified that:

         1. The name of the corporation (hereinafter called the "Corporation")
is Xybernaut Corporation.

         2. The Certificate of Designation (Series E Preferred Stock) of the
Corporation was filed with the Secretary of State of Delaware on May 11, 1999.

         3. No shares of Series E Preferred Stock have been issued.

         4. The Certificate of Designation (Series E Preferred Stock) of the
Corporation is hereby amended by deleting the resolution adopted by the Board of
Directors of the Corporation and Paragraph 1 thereof and by substituting in lieu
thereof the following (i) new resolution adopted by the Board of Directors of
the Corporation to increase the number of shares of Series E Preferred Stock
from "2,000" to "2,100" and (ii) new Paragraph 1:

         A. "RESOLVED, that pursuant to the authority expressly granted to and
vested in the Board of Directors of the Corporation by the provisions of the
Certificate of Incorporation of the Corporation (the "Certificate of
Incorporation"), there hereby is created, out of the 6,000,000 shares of
Preferred Stock, par value $0.01 per share, of the Corporation authorized in
Article Fourth of the Certificate of Incorporation (the "Preferred Stock"), a
series of the Preferred Stock of the Corporation consisting of 2,100 shares,
which series shall have the following powers, designations, preferences and
relative, participating, optional and other rights, and the following
qualifications, limitations and restrictions:"

         B. "1. Designation and Amount. This series of Preferred Stock shall be
designated "Series E Preferred Stock" and the authorized number of shares
constituting such series shall be 2,100. The par value of the Series E Preferred
Stock shall be $0.01 per share. The Series E Preferred Stock shall have a stated
value of $1,000 per share."

                                      E-22

<PAGE>



         4. The amendment to the Certificate of Designation (Series E Preferred
Stock) herein certified has been duly adopted in accordance with the provisions
of Section 151(g) of the General Corporation Law of the State of Delaware.


Signed on May 12, 1999.

                                         Xybernaut Corporation


                                         By:/s/Edward G. Newman
                                            ------------------------------------
                                               Edward G. Newman, President

                                      E-23

                                                                     EXHIBIT 4.1
                                                                     -----------


                     FORM OF SECURITIES PURCHASE AGREEMENT


                  THIS SECURITIES PURCHASE AGREEMENT, dated as of May 11, 1999
(this "Agreement"), is entered into by and between XYBERNAUT CORPORATION, a
Delaware corporation (Nasdaq SmallCap Market Symbol "XYBR"), with headquarters
located at 12701 Fair Lakes Circle, Fairfax, Virginia 22033 (the "Company"), and
FOREST AVENUE LLC, a Cayman Islands limited liability company (the "Buyer").

                              W I T N E S S E T H:

                  WHEREAS, the Company and the Buyer are executing and
delivering this Agreement in accordance with and in reliance upon the exemption
from securities registration afforded, inter alia, by Rule 506 under Regulation
D ("Regulation D") as promulgated by the United States Securities and Exchange
Commission (the "SEC") under the Securities Act of 1933, as amended (the "1933
Act"), and/or Section 4(2) of the 1933 Act; and

                  WHEREAS, the Buyer wishes to purchase and the Company wishes
to sell, upon the terms and subject to the conditions of this Agreement, shares
of Series E Preferred Stock, $.01 par value per share (the "Preferred Stock"),
of the Company which will be convertible into shares of Common Stock, $.01 par
value per share of the Company (the "Common Stock"), upon the terms and subject
to the conditions of the Certificate of Designation for the Preferred Stock
attached hereto as Exhibit 1 (the "Certificate of Designation") and the Common
Stock Purchase Warrant to purchase Common Stock attached hereto as Exhibit 4(l)
(the "Warrants") (the Preferred Stock, the Warrants and shares of Common Stock
issuable upon conversion of the Preferred Stock and the exercise of the Warrants
sometimes collectively referred to herein as the "Securities");

                  NOW, THEREFORE, in consideration of the premises and the
mutual covenants contained herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties agree as
follows:

         1.       AGREEMENT TO PURCHASE; PURCHASE PRICE.

         a. PURCHASE. The Buyer hereby agrees to purchase from the Company two
thousand (2,000) shares of the Company's Preferred Stock and Warrants to
purchase in the aggregate fifty (50,000) shares of the Company's Common Stock
per $2,000,000 of Preferred Stock purchased (or such pro rata amount if more or
less than $2,000,000 is purchased) for an aggregate purchase price of
$2,000,000. The purchase price for each share of Preferred Stock shall be $1,000
and shall be payable in United States Dollars.

         b. FORM OF PAYMENT. The Buyer shall pay the purchase price for the
Preferred Stock by delivering immediately available good funds in United States
Dollars to the escrow agent (the "Escrow Agent") identified in the Escrow
Agreement attached hereto as Exhibit 1(b) (the "Escrow Agreement") as set forth
below.

                                      E-24

<PAGE>



         c. METHOD OF PAYMENT. Payment into escrow of the purchase price for the
Preferred Stock shall be made by wire transfer of funds to:

                      CITIBANK N.A.
                      153 East 53rd Street
                      New York, New York 10043

                      Account Name: Parker Chapin Flattau & Klimpl, LLP

                      Account No.: 37432544
                      Citibank ABA No.: 021000089

Not later than 2:00 p.m., New York time, on the date the Company and the Buyer
shall have executed this Agreement and returned a signed counterpart of this
Agreement to the Escrow Agent by facsimile and the Buyer shall deposit with the
Escrow Agent the aggregate purchase price for the Preferred Stock, in currently
available funds.

         2.       BUYER'S REPRESENTATIONS, WARRANTIES, ETC.; ACCESS TO
INFORMATION; INDEPENDENT INVESTIGATION.

         The Buyer represents and warrants to, and covenants and agrees with,
the Company as follows:

         a. Without limiting the Buyer's right to sell the Common Stock pursuant
to a registration statement or an exemption from registration, the Buyer is
purchasing the Preferred Stock and the Warrants and will be acquiring the shares
of Common Stock issuable upon conversion of the Preferred Stock and exercise of
the Warrants for its own account for investment only and not with a view towards
the public sale or distribution thereof and not with a view to or for sale in
connection with any distribution thereof;

         b. The Buyer is (i) an "accredited investor" as that term is defined in
Rule 501 of the General Rules and Regulations under the 1933 Act by reason of
Rule 501(a)(3), (ii) experienced in making investments of the kind described in
this Agreement and the related documents, (iii) able, by reason of the business
and financial experience of its officers (if an entity) and professional
advisors (who are not affiliated with or compensated in any way by the Company
or any of its affiliates or selling agents), to protect its own interests in
connection with the transactions described in this Agreement, and the related
documents, and (iv) able to afford the entire loss of its investment in the
Securities;

         c. The Buyer is not subscribing for the Preferred Stock and the
Warrants as a result of or subsequent to any advertisement, article, notice or
other communication published in any newspaper, magazine or similar media or
broadcast over television or radio or presented at any seminar;

         d. The Buyer understands that the shares of Preferred Stock and the
Warrants are being offered and sold, and the Shares are being offered, to the
Buyer in reliance on specific exemptions from the registration requirements of
United States federal and state securities laws and that the Company is relying
upon the truth and accuracy of, and the Buyer's compliance with, the
representations, warranties, agreements, acknowledgments and understandings of
the Buyer set forth herein in order to determine the

                                      E-25

<PAGE>



availability of such exemptions and the eligibility of the Buyer to acquire the
Preferred Stock and the Warrants and to receive an offer of the Shares;

         e. The Buyer and its advisors, if any, have been furnished with all
materials relating to the business, finances and operations of the Company and
materials relating to the offer and sale of the Preferred Stock and the Warrants
and the offer of the Shares which have been requested by the Buyer, including
Schedule 2(e) hereto. The Buyer and its advisors, if any, have been afforded the
opportunity to ask questions of the Company and have received complete and
satisfactory answers to any such inquiries. Without limiting the generality of
the foregoing, the Buyer has also had the opportunity to obtain and to review
the Company's (1) Annual Report on Form 10-K for the fiscal year ended December
31, 1998, (2) Quarterly Report on Form 10-Q for the fiscal quarters ended
September 30, 1998, June 30, 1998 and March 31, 1998, (3) Form 8-K dated June 4,
1998, and (4) Form S-3/A filed on January 08, 1999, (collectively, the
"Company's SEC Documents").

         f. The Buyer understands that its investment in the Securities involves
a high degree of risk;

         g. The Buyer understands that no United States federal or state agency
or any other government or governmental agency has passed on or made any
recommendation or endorsement of the Securities;

         h. This Agreement has been duly and validly authorized, executed and
delivered on behalf of the Buyer and is a valid and binding agreement of the
Buyer enforceable in accordance with its terms, subject as to enforceability to
general principles of equity and to bankruptcy, insolvency, moratorium and other
similar laws affecting the enforcement of creditors' rights generally;

         i. As of the Closing Date, neither the Buyer, its agents nor any of its
affiliates, has a short position in the Common Stock of the Company.

         j. Notwithstanding the provisions hereof or of the Preferred Stock, in
no event (except with respect to an automatic conversion of the Preferred Stock
as provided in the Certificate of Designation) shall a Buyer be entitled to
convert any shares of Preferred Stock to the extent after such conversion, the
sum of (1) the number of shares of Common Stock beneficially owned by the Buyer
and its affiliates (other than shares of Common Stock which may be deemed
beneficially owned through the ownership of the unconverted portion of the
Preferred Stock and the unexercised portion of any Warrants), and (2) the number
of shares of Common Stock issuable upon the conversion of the Preferred Stock
and exercise of the Warrants with respect to which the determination of this
proviso is being made, would result in beneficial ownership by the Buyer and its
affiliates of more than 4.99% of the outstanding shares of Common Stock. For
purposes of the proviso to the immediately preceding sentence, beneficial
ownership shall be determined in accordance with Section 13(d) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), except as otherwise
provided in clause (1) of such proviso. The preceding shall not interfere with
any Buyer's right to convert the Preferred Stock or exercise the Warrants which
in the aggregate total more than 4.99% of the outstanding shares of Common
Stock, over time, as long as no single Buyer owns more than 4.99% of the
outstanding Common Stock at any given time.


                                      E-26

<PAGE>



         3.       COMPANY REPRESENTATIONS, ETC.

                  The Company represents and warrants to the Buyer that:

         a. ORGANIZATION AND GOOD STANDING. The Company is a corporation duly
incorporated and existing in good standing under the laws of the State of
Delaware and has all requisite corporate authority to own its properties and to
carry on its business as now being conducted. The Company is duly qualified as a
foreign corporation to do business and is in good standing in every jurisdiction
in which the nature of the business conducted or property owned by it makes such
qualification necessary, other than those in which the failure so to qualify
would not be expected to have a material adverse effect on the business or
financial condition of the Company, or materially and adversely affect the
ability of the Company to perform its obligations pursuant to this Agreement.
Except as disclosed in Schedule 3(a), the Company's SEC Documents or any public
filings made by the Company with the SEC after the date hereof including the
Company's SEC Documents (the "Commission Filings"), the Company does not
presently own or control, directly or indirectly, any interest in any other
corporation, partnership, association or other business entity.

         b. CONCERNING THE SHARES. The authorized capital stock of the Company
consists of 40,000,000 shares of Common Stock, $.01 par value per share, and
Schedule 3(b) sets forth the number of shares which are issued and outstanding,
and the number of shares of preferred stock, $.01 par value per share, which are
issued and outstanding. All of the outstanding shares of Common Stock and
Preferred Stock of the Company have been duly and validly authorized and issued
and are fully paid and nonassessable. No shares of Common Stock are subject to
preemptive or similar rights. Except as specifically disclosed herein, there are
no outstanding options, warrants, rights to subscribe to, calls or commitments
of any character whatsoever relating to, or, except as a result of the purchase
and sale of the Preferred Stock and the Warrants, securities, rights or
obligations convertible into or exchangeable for, or giving any person any right
to subscribe for or acquire, any shares of Common Stock, or contracts,
commitments, understandings, or arrangements by which the Company or any
subsidiary is or may become bound to issue additional shares of Common Stock or
securities or rights convertible or exchangeable into shares of Common Stock.

         c. REPORTING COMPANY STATUS. The Company has registered its Common
Stock pursuant to Section 12 of the Exchange Act and the Common Stock is listed
and traded on the Nasdaq SmallCap Market. The Company is in compliance, to the
extent applicable, with all reporting obligations under either Section 12(b),
12(g) or 15(d) of the Exchange Act. The Company has complied in all material
respects and to the extent applicable with all reporting obligations, under
either Section 13(a) or 15(d) of the Exchange Act for a period of at least
twelve (12) months immediately preceding the offer and sale of the Securities.
Except as set forth in Schedule 3(c) hereto, the Company has received no notice,
either oral or written, with respect to the continued eligibility of the Common
Stock for such listing on the Nasdaq Small Cap Market.

         d. AUTHORIZED SHARES. The Company has sufficient authorized and
unissued Shares as may be reasonably necessary to effect the conversion of the
Preferred Stock and the exercise of the Warrants. The Shares have been duly
authorized and, when issued upon conversion of the Preferred Stock and upon
exercise of the Warrants, will be duly and validly issued, fully paid and
non-assessable and will not subject the holder thereof to personal liability by
reason of being such holder.


                                      E-27

<PAGE>



         e. SECURITIES PURCHASE AGREEMENT; ESCROW AGREEMENT; REGISTRATION RIGHTS
AGREEMENT AND COMMON STOCK. The Company has the requisite corporate power and
authority to enter into and perform its obligations under this Agreement, and
all exhibits attached hereto, and to issue the Preferred Stock, the Warrants,
and the shares of Common Stock underlying the Preferred Stock and the Warrants.
This Agreement, the Escrow Agreement and the Registration Rights Agreement, the
form of which is attached hereto as Exhibit 4(e) (the "Registration Rights
Agreement"), and the transactions contemplated hereby and thereby, have been
duly and validly authorized by the Company, this Agreement has been duly
executed and delivered by the Company and this Agreement is, and the Escrow
Agreement and the Registration Rights Agreement, when executed and delivered by
the Company, will be, valid and binding agreements of the Company enforceable in
accordance with their respective terms, subject as to enforceability to general
principles of equity and to bankruptcy, insolvency, moratorium, and other
similar laws affecting the enforcement of creditors' rights generally; and the
Preferred Stock and the Warrants will be duly and validly authorized and, when
executed and delivered on behalf of the Company in accordance with this
Agreement, will be a valid and binding obligation of the Company in accordance
with its terms, subject to general principles of equity and to bankruptcy,
insolvency, moratorium, or other similar laws affecting the enforcement of
creditors' rights generally.

         f. NON-CONTRAVENTION. Except as set forth on Schedule 3(f)(ii) hereto,
the execution and delivery of this Agreement, the Escrow Agreement and the
Registration Rights Agreement by the Company, the issuance of the Securities,
and the consummation by the Company of the other transactions contemplated by
this Agreement, the Escrow Agreement, the Registration Rights Agreement, and the
Preferred Stock do not and will not conflict with or result in a breach by the
Company of any of the terms or provisions of, or constitute a default under (i)
the articles of incorporation or by-laws of the Company, each as currently in
effect, (ii) any indenture, mortgage, deed of trust, or other material agreement
or instrument to which the Company is a party or by which it or any of its
properties or assets are bound, including any listing agreement for the Common
Stock or any "lock-up" or similar provision of any underwriting or similar
agreements except as herein set forth, (iii) to its knowledge, any existing
applicable law, rule, or regulation or any applicable decree, judgment, or (iv)
to its knowledge, order of any court, United States federal or state regulatory
body, administrative agency, or other governmental body having jurisdiction over
the Company or any of its properties or assets, except such conflict, breach or
default which would not have a material adverse effect on the transactions
contemplated herein.

         g. COMPLIANCE WITH LAW. The business of the Company is not being
conducted in violation of any law, ordinance or regulation of any governmental
entity, except for possible violations that either singly or in the aggregate
would not be expected to have a material adverse effect on the business or
financial condition of the Company, or materially and adversely affect the
ability of the Company to perform its obligations pursuant to this Agreement.
The Company is not required under federal, state or local law, rule or
regulation to obtain any consent, authorization or order of, or make any filing
or registration with, any court or governmental agency in order for it to
execute, deliver or perform any of its obligations under this Agreement or issue
and sell the Common Stock, Preferred Stock, or the Warrants, in accordance with
the terms hereof.

         h. APPROVALS. No authorization, approval or consent of any court,
governmental body, regulatory agency, self-regulatory organization, or stock
exchange or market or the stockholders of the Company is required to be obtained
by the Company for the issuance and sale of the Securities to the Buyer as
contemplated by this Agreement, except such authorizations, approvals and
consents that have been obtained.

                                      E-28

<PAGE>




         i. SEC FILINGS. None of the Company's SEC Documents filed with the SEC
since (and including) the filing of the Form 10-K SB for the fiscal year ended
December 31, 1998 contained, at the time they were filed, 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 made therein in light of the
circumstances under which they were made, not misleading. Except as set forth on
Schedule 3(i) hereto, the Company has since September 30, 1998 timely filed all
requisite forms, reports and exhibits thereto with the SEC and such filings
comply in all material respects with the requirements of the 1933 Act or the
Exchange Act, as the case may be, and the rules and regulations of the SEC
promulgated thereunder. The Company has not provided to the Buyer any
information that, according to applicable law, rule or regulation, should have
been disclosed publicly prior to the date hereof by the Company, but which has
not been so disclosed. The financial statements of the Company included in the
documents referred to in Section 2(e) hereof comply as to form in all material
respects with applicable accounting requirements and the published rules and
regulations of the SEC or other applicable rules and regulations with respect
thereto.

         j. ABSENCE OF CERTAIN CHANGES. Since the filing of the Company's
Quarterly Report on Form 10-Q for fiscal quarter ended on September 30, 1998,
there has been no material adverse change and no material adverse development in
the business, properties, operations, financial condition, or results of
operations of the Company, except as disclosed in the documents referred to in
Section 2(e) hereof or the Commission Filings.

         k. FULL DISCLOSURE. There is no fact known to the Company (other than
general economic conditions known to the public generally) or as disclosed in
the documents referred to in Section 2(e), that has not been disclosed in
writing to the Buyer that (i) would reasonably be expected to have a material
adverse effect on the business or financial condition of the Company or (ii)
would reasonably be expected to materially and adversely affect the ability of
the Company to perform its obligations pursuant to this Agreement.

         l. ABSENCE OF LITIGATION. Except as set forth in Schedule 3(l) hereto
or the Commission Filings, and in the documents referred to in Section 2(e),
which the Buyer has reviewed, there is no action, suit, proceeding, inquiry or
investigation before or by any court, public board or body pending or, to the
knowledge of the Company, threatened against or affecting the Company, wherein
an unfavorable decision, ruling or finding would have a material adverse effect
on the business or financial condition of the Company or the transactions
contemplated by this Agreement or any of the documents contemplated hereby or
which would adversely affect the validity or enforceability of, or the authority
or ability of the Company to perform its obligations under, this Agreement or
any of such other documents. Except as set forth in Schedule 3(l) hereto, and in
the documents referenced in Section 2(e) or the Commission Filings, no judgment,
order, decree, writ or award has been issued by, or to the Company's knowledge,
requested of any court, arbitrator, or governmental agency which would have a
material adverse effect on the business or financial condition of the Company or
the transactions contemplated by this Agreement or any of the documents annexed
hereto, or which would adversely and materially affect the Company's ability to
perform its obligations under this Agreement or any document annexed hereto.

         m. ABSENCE OF EVENTS OF DEFAULT. Except as set forth in Schedule 3(m)
hereto and Section 3(g) or the Commission Filings, no Event of Default, as
defined in the agreement to which the Company is a party, and no event which,
with the giving of notice or the passage of time or both, would become an

                                      E-29

<PAGE>



Event of Default (as so defined in such agreement), has occurred and is
continuing, which would have a material adverse effect on the Company's
financial condition or results of operations.

         n. PRIOR ISSUES. Schedule 3(p) sets forth all of the presently
outstanding unconverted shares of convertible securities of the Company as at
May 11, 1999.

         4.       CERTAIN COVENANTS AND ACKNOWLEDGMENTS.

         a. TRANSFER RESTRICTIONS. The Buyer acknowledges that (1) the shares of
Preferred Stock and the Warrants have not been and are not being registered
under the provisions of the 1933 Act and, except as provided in the Registration
Rights Agreement, the Shares have not been and are not being registered under
the 1933 Act, and may not be transferred unless (A) in accordance with
Regulation D, (B) subsequently registered thereunder or (C) an exemption from
registration exists and the Buyer shall have delivered to the Company any
information reasonably necessary for the Company's independent counsel to
prepare and deliver an opinion of counsel, reasonably satisfactory in form,
scope and substance to the Company, to the effect that the Securities to be sold
or transferred may be sold or transferred pursuant to an exemption from such
registration; (2) any sale of the Securities made in reliance on Rule 144
promulgated under the 1933 Act may be made only in accordance with the terms of
said Rule and further, if said Rule is not applicable, any resale of such
Securities under circumstances in which the seller, or the person through whom
the sale is made, may be deemed to be an underwriter, as that term is used in
the 1933 Act, may require compliance with some other exemption under the 1933
Act or the rules and regulations of the SEC thereunder; and (3) neither the
Company nor any other person is under any obligation to register the Securities
(other than pursuant to the Registration Rights Agreement) under the 1933 Act or
to comply with the terms and conditions of any exemption thereunder.

         b. The Buyer covenants that it will not knowingly make any sale,
transfer or other disposition of the Preferred Stock, the Warrants and/or Shares
in violation of the 1933 Act, the Exchange Act, or the rules and regulations of
the SEC promulgated under any of the foregoing.

         c. The Buyer, its respective agents and any and all of their respective
affiliates will abide by all SEC rules and regulations regarding shorting.

         d. RESTRICTIVE LEGEND. The Buyer acknowledges and agrees that the
Preferred Stock, and, until such time as the Common Stock has been registered
under the 1933 Act as contemplated by the Registration Rights Agreement and sold
pursuant to an effective registration statement ("Registration Statement") or an
exemption from registration, the Shares issued to the Buyer upon conversion of
the Preferred Stock and exercise of the Warrants shall bear a restrictive legend
in substantially the following form:

                  THESE SECURITIES (THE "SECURITIES") HAVE NOT BEEN REGISTERED
                  UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
                  ACT"), OR THE SECURITIES LAWS OF ANY STATE AND MAY NOT BE SOLD
                  OR OFFERED FOR SALE EXCEPT PURSUANT TO AN EFFECTIVE
                  REGISTRATION STATEMENT FOR THE SECURITIES OR AN OPINION OF
                  COUNSEL OR OTHER EVIDENCE ACCEPTABLE TO THE CORPORATION THAT
                  SUCH REGISTRATION IS NOT REQUIRED.


                                      E-30

<PAGE>



         e. REGISTRATION RIGHTS AGREEMENT. The parties hereto agree to enter
into the Registration Rights Agreement, in substantially the form attached
hereto as Exhibit 4(e), on or before the Closing Date (as defined in Section
7(b) hereof), and the Company shall cause such Registration Rights Agreement to
remain in full force and effect for so long as the Securities are outstanding,
and the Company shall comply with the terms thereof.

         f. FILINGS. The Company undertakes and agrees to make all necessary
filings in connection with the sale of the Preferred Stock and the Warrants to
the Buyer under any United States laws and regulations, or by any domestic
securities exchange or trading market, and to provide a copy thereof to the
Buyer promptly after such filing.

         g. REPORTING STATUS. So long as the Buyer beneficially owns any of the
Preferred Stock and/or the Warrants, the Company shall file all reports required
to be filed with the SEC pursuant to Section 13 or 15(d) of the Exchange Act,
and the Company shall not terminate its status as an issuer required to file
reports under the Exchange Act even if the Exchange Act or the rules and
regulations thereunder would permit such termination.

         h. USE OF PROCEEDS. The Company will use the proceeds from the sale of
the Preferred Stock and the Warrants (excluding amounts paid by the Company for
legal fees and finder's fees in connection with the sale of the Preferred Stock
and the Warrants) for the production and marketing of the Company's Mobile
Assistant(R) IV and related products and for general working capital purposes
and acquisitions; provided, however, no proceeds from the sale of the Preferred
Stock or the Warrants will be used directly or indirectly to engage in a
transaction or any transaction with an Affiliate (as hereinafter defined)of the
Company. For purposes of this section, "Affiliate" shall mean a person that
directly, or indirectly through one or more intermediaries controls, or is
controlled by, or is under common control with such designated person.

         i. CERTAIN AGREEMENTS. (i) The Company covenants and agrees that it
will not, without the prior written consent of the Buyer, enter into any
subsequent or further offer or sale of Common Stock or securities convertible
into Common Stock with any third party ("Subsequent Financing") until the
earlier of (a) the date which is one hundred eighty (180) days after the
Effective Date (as defined below) or (b) the date on which 85% of the Preferred
Stock shares have been converted into shares of Common Stock (the "Non-Financing
Period"). If the Company receives a proposal for a Subsequent Financing during
the Non-Financing Period, upon receipt of such proposed terms the Company
covenants and agrees to promptly furnish a notice to the Buyer which sets forth
the terms of the proposed Subsequent Financing. The Buyer shall have the right,
exercisable for a period of ten (10) days after receipt of the written notice
from the Company, to consummate the Subsequent Financing with the Company on the
same terms and conditions as the proposed Subsequent Financing within ten (10)
days after making the election. If the Buyer does not exercise its right to
consummate the Subsequent Financing as set forth herein, the Company shall be
free to enter into the proposed Subsequent Financing on substantially the same
terms as disclosed to the Buyer. If the Buyer exercises its right within such
ten (10) day period but do not close the Subsequent Financing, other than due to
a breach by the Company, the Buyer shall be liable to the Company if the
counterparty to the Subsequent Financing no longer wishes to engage in the
transaction. Notwithstanding the foregoing, the Company may enter into a
Subsequent Financing without the prior written consent of the Buyer if such
Subsequent Financing is exempt from securities registration under Regulation D
and the Company is not required to file a registration statement with respect to
the underlying

                                      E-31

<PAGE>



securities within one hundred twenty (120) days of the Effective Date (as
defined below) or if the proceeds from such Subsequent Financing are used to
redeem all of the then outstanding Preferred Stock.

                  (ii) The provisions of subparagraph (i)(i) will not apply to
(x) the issuance of securities (other than for cash) in connection with a
merger, consolidation, strategic alliance, sale of assets, disposition or
entering into a binding agreement with an investment banking firm of recognized
regional or national status to obtain financing and provide investment banking
services or (y) the exchange of the capital stock for assets, stock or other
joint venture interests.

                  (iii) The term "Effective Date" means the effective date of
the Registration Statement covering the Registrable Securities (as defined in
the Registration Rights Agreement).

         j. AVAILABLE SHARES. The Company shall have at all times authorized and
reserved for issuance, free from preemptive rights, shares of Common Stock
sufficient to yield the number of shares of Common Stock issuable upon
conversion and/or exercise as may be required to satisfy the conversion rights
of the Buyer pursuant to the terms and conditions of the Preferred Stock and the
exercise rights of the Buyer pursuant to the terms of the Warrants.

         k. DILUTION. The Company acknowledges that the number of Shares
issuable upon conversion of the Preferred Stock and/or exercise of the Warrants
may increase substantially in certain circumstances, including, but not limited
to, when the trading price of the Common Stock declines prior to a conversion
and that the issuance of the Shares upon such a conversion of the Preferred
Stock may have a dilutive effect of the ownership interest of the other
shareholders of the Company.

         l. WARRANTS. The Company agrees to issue to the Buyer on the Closing
Date Warrants to purchase an aggregate of fifty thousand (50,000) shares of
Common Stock per $2,000,000 of Preferred Stock purchased (or such pro rata
amount if more or less than $2,000,000 is purchased). Such Warrants shall bear
an exercise price equal to one hundred twenty-five percent (125%) of the Closing
Price (as defined in the Warrant) and shall expire on the third anniversary of
the issuance date of the Warrant, in the form annexed hereto as Exhibit 4(l),
together with registration rights granted pursuant to the Registration Rights
Agreement.

         m. LISTING OF COMMON STOCK. The Company shall (a) as soon as
practicable, prepare and file with the Nasdaq Small Cap Market (as well as any
other national securities exchange, market or trading facility on which the
Common Stock is then listed) an additional shares listing application covering
the amount of shares of Common Stock issued upon the conversion of the Series E
Preferred Stock or the exercise of the Warrants, (b) take all steps necessary to
cause such shares to be approved for listing on the Nasdaq Small Cap Market (as
well as on any other national securities exchange, market or trading facility on
which the Common Stock is then listed) as soon as possible thereafter, and (c)
provide to the Buyer evidence of such listing, and the Company shall maintain
the listing of its Common Stock on such exchange or market. The Company will
comply with the listing and trading requirements of its Common Stock on Nasdaq
Small Cap Market (including, without limitation, maintaining sufficient net
tangible assets) and will comply in all respects with the Company's reporting,
filing and other obligations under the bylaws or rules of the Nasdaq Small Cap
Market. In the event the Company receives notification from Nasdaq or any other
controlling entity stating that the Company is not in compliance with the
listing qualifications of the Nasdaq Small Cap Market, the Company will take all
action necessary to bring the Company within compliance with all applicable
listing standards of the Nasdaq Small Cap Market.

                                      E-32

<PAGE>




         n. EXCHANGE ACT REGISTRATION. The Company will maintain the
registration of its Common Stock under Section 12 of the Exchange Act, will
comply in all respects with its reporting and filing obligations under the
Exchange Act, and will not take any action or file any document (whether or not
permitted by Exchange Act or the rules thereunder) to terminate or suspend such
registration or to terminate or suspend its reporting and filing obligations
under said Act.

         o. CORPORATE EXISTENCE. The Company will take all steps necessary to
preserve and continue the corporate existence of the Company.

         p. NOTICE OF CERTAIN EVENTS AFFECTING REGISTRATION. The Company will
immediately notify the Buyer upon the occurrence of any of the following events
in respect of a registration statement or related prospectus in respect of an
offering of Registrable Securities (as defined in the Registration Rights
Agreement): (i) receipt of any request for additional information by the SEC or
any other federal or state governmental authority during the period of
effectiveness of the Registration Statement for amendments or supplements to the
Registration Statement or related prospectus; (ii) the issuance by the SEC or
any other federal or state governmental authority of any stop order suspending
the effectiveness of the Registration Statement or the initiation of any
proceedings for that purpose; (iii) receipt of any notification with respect to
the suspension of the qualification or exemption from qualification of any of
the Registrable Securities for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose; (iv) the happening of any event
that makes any statement made in the Registration Statement or related
prospectus or any document incorporated or deemed to be incorporated therein by
reference untrue in any material respect or that requires the making of any
changes in the Registration Statement, related prospectus or documents so that,
in the case of the Registration Statement, it will 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, and
that in the case of the related prospectus, it will 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, in the light of the
circumstances under which they were made, not misleading; and (v) the Company's
reasonable determination that a post-effective amendment to the Registration
Statement would be appropriate. The Company will promptly make available to the
Buyer any such supplement or amendment to the related prospectus.

         q. LEGAL OPINION. The Company's independent counsel shall deliver to
the Buyer upon execution of this Agreement, an opinion in the form of Exhibit
4(q). The Company will obtain for the Buyer, at the Company's expense, any and
all opinions of counsel which may be reasonably required in order to convert the
Preferred Stock and/or exercise the Warrants, including, but not limited to,
obtaining for the Buyer an opinion of counsel, subject only to receipt of a
notice of conversion, and/or subject only to a receipt of a notice of exercise
in the form annexed to the Warrant, and in connection with the resale of the
Shares by the Buyer directing the transfer agent to remove the legend from the
certificate.

         r. PERMITTED OFFERINGS. Notwithstanding anything to the contrary set
forth herein (including, without limitation, Section 4(i) hereof), the Company
shall be permitted to issue and sell its Common Stock or securities, convertible
into its Common Stock in a registered offering or private placement, provided,
that the proceeds of such offering shall be applied first to redeem all the
Preferred Stock in accordance with the terms of the Certificate of Designation
and after all the Preferred Stock has been so redeemed, any remaining proceeds
may be used in accordance with the Company's direction.

                                      E-33

<PAGE>



         5.       TRANSFER AGENT INSTRUCTIONS.

         a. Promptly following the Closing Date, the Company will irrevocably
instruct its transfer agent to issue Common Stock from time to time upon
conversion of the Preferred Stock and/or exercise of the Warrants in such
amounts as specified from time to time by the Company to the transfer agent,
bearing the restrictive legend specified in Section 4(d) of this Agreement prior
to registration of the Shares under the 1933 Act and resale of the Shares,
registered in the name of the Buyer or its nominee and in such denominations to
be specified by the Buyer in connection with each conversion of the Preferred
Stock and/or exercise of the Warrants. The Company warrants that no instruction
other than such instructions referred to in this Section 5 and stop transfer
instructions to give effect to Section 4(a) hereof prior to registration and
sale of the Shares under the 1933 Act will be given by the Company to the
transfer agent and that the Shares shall otherwise be freely transferable on the
books and records of the Company as and to the extent provided in this
Agreement, the Registration Rights Agreement, and applicable law. Nothing in
this Section shall affect in any way the Buyer's obligations and agreement to
comply with all applicable securities laws upon resale of the Securities. If the
Buyer provides the Company with an opinion of counsel reasonably satisfactory to
the Company that registration of a resale by the Buyer of any of the Securities
in accordance with clause (1)(B) of Section 4(a) of this Agreement is not
required under the 1933 Act, the Company shall (except as provided in clause (2)
of Section 4(a) of this Agreement) permit the transfer of the Shares and, in the
case of the Shares, promptly instruct the Company's transfer agent to issue one
or more certificates for Common Stock without legend in such name and in such
denominations as specified by the Buyer.

         b. The Company will permit the Buyer to exercise its right to convert
the Preferred Stock by telecopying an executed and completed Notice of
Conversion to the Company and delivering within three (3) business days
thereafter, the original Notice of Conversion and the certificates representing
the Preferred Stock being converted to the Company by express courier, with a
copy to the transfer agent. Each date on which a Notice of Conversion is
telecopied to and received by the Company in accordance with the provisions
hereof shall be deemed a Conversion Date. The Company will transmit the
certificates representing the Converted Shares issuable upon conversion of any
Preferred Stock (together with certificates representing the Preferred Stock not
being so converted) to the Buyer via express courier, by electronic transfer or
otherwise, within three (3) business days after receipt by the Company of the
original Notice of Conversion and the certificate representing the Preferred
Stock being converted (the "Delivery Date").

         c. The Company understands that a delay in the issuance of the Shares
of Common Stock beyond the Delivery Date could result in economic loss to the
Buyer. As compensation to the Buyer for such loss, the Company agrees to pay
late payments to the Buyer for late issuance of Shares upon Conversion in
accordance with the following schedule (where "No. Business Days Late" is
defined as the number of business days beyond five (5) business days from
Delivery Date); provided, however, the Company shall not be obligated to make
any payment under this Section if the cause of such delay in the issuance of the
Shares of Common Stock is not caused by the Company or is the result of an act,
omission or circumstance beyond the control of the Company and/or its agents.

                                             Late Payment For Each
                                             $10,000 of Initial Preferred Stock
                 No. Business Days Late      Principal Amount Being Converted
                 ---------------------------------------------------------------


                                      E-34

<PAGE>



                          1                           $100
                          2                           $200
                          3                           $300
                          4                           $400
                          5                           $500
                          6                           $600
                          7                           $700
                          8                           $800
                          9                           $900
                          10                          $1,000
                          >10                         $1,000 +$200 for each
                                                      Business
                                                      Day Late beyond 10 days

The Company shall pay any payments incurred under this Section in immediately
available funds upon demand. Nothing herein shall limit the Buyer's right to
pursue actual damages for the Company's failure to issue and deliver the Common
Stock to the Buyer. Furthermore, in addition to any other remedies which may be
available to the Buyer, in the event that the Company fails for any reason to
effect delivery of such shares of Common Stock within five (5) business days
after the Delivery Date, the Buyer will be entitled to revoke the relevant
Notice of Conversion by delivering a notice to such effect to the Company
whereupon the Company and the Buyer shall each be restored to their respective
positions immediately prior to delivery of such Notice of Conversion.

         d. In lieu of delivering physical certificates representing the Common
Stock issuable upon conversion, provided the Company's transfer agent is
participating in the Depository Trust Company ("DTC") Fast Automated Securities
Transfer program, upon request of the Buyer and its compliance with the
provisions contained in this paragraph, so long as the certificates therefor do
not bear a legend and the Buyer thereof is not obligated to return such
certificate for the placement of a legend thereon, the Company shall use its
best efforts to cause its transfer agent to electronically transmit the Common
Stock issuable upon conversion to the Buyer by crediting the account of the
Buyer's Prime Broker with DTC through its Deposit Withdrawal Agent Commission
system.

         6.       DELIVERY INSTRUCTIONS.

                  The Preferred Stock shall be delivered by the Company to the
Escrow Agent pursuant to Section 1(b) hereof, on a delivery against payment
basis on the Closing Date.

         7.       CLOSING DATE.

         a. The date and time of the issuance and sale of the Preferred Stock
("Closing Date") shall occur no later than 1:00 P.M., New York time on the date
of the fulfillment or waiver of all of the closing conditions pursuant to
Sections 8 and 9, or such other mutually agreed to time. The closing shall occur
on such date at the offices of the Escrow Agent. Notwithstanding anything to the
contrary contained herein, the Escrow Agent will be authorized to release the
funds representing the Purchase Price for the Preferred Stock and the Warrants,
and the Preferred Stock and the Warrants only upon satisfaction of each of the
conditions set forth in Sections 8 and 9 hereof.


                                      E-35

<PAGE>



         b. Notwithstanding anything to the contrary contained in Section 7(a),
the Closing Date shall be upon the execution by the parties of this Agreement,
and the payment of the Purchase Price and the delivery of the original stock
certificates evidencing the Preferred Stock and the Warrants; provided, that the
Closing Date is a business day, and, if not, then the immediately following
business day.

         8.       CONDITIONS TO THE COMPANY'S OBLIGATION TO SELL.

                  The Buyer understands that the Company's obligation to sell
the Preferred Stock and the Warrants on the Closing Date to the Buyer pursuant
to this Agreement is conditioned upon:

         a. Acceptance by the Buyer of this Agreement as evidenced by execution
of this Agreement and all agreements annexed hereto by the Buyer for at least
$2,000,000 of Preferred Stock (or such lesser amount as the Company, in its sole
discretion, shall determine);

         b. Delivery by the Buyer to the Escrow Agent of good funds as payment
in full of an amount equal to the Purchase Price for the Preferred Stock and the
Warrants in accordance with Section 1(c) hereof;

         c. The accuracy in all material respects on the Closing Date of the
representations and warranties of the Buyer contained in this Agreement as if
made on the Closing Date, except for representation and warranties that are
expressly made as of a particular date, and the performance by the Buyer on or
before the Closing Date of all covenants and agreements of the Buyer required to
be performed on or before the Closing Date;

         d. There shall not be in effect any law, rule or regulation prohibiting
or restricting the transactions contemplated hereby, or requiring any consent or
approval which shall not have been obtained.

         9.       CONDITIONS TO BUYER'S OBLIGATION TO PURCHASE.

                  The Company understands that each Buyer's obligation to
purchase the Preferred Stock on the Closing Date is conditioned upon:

         a. Acceptance by the Company of an Agreement for the sale of Preferred
Stock and the Warrants, as evidenced by execution of this Agreement and all
agreements annexed hereto by the Company;

         b. Delivery by the Company to the Escrow Agent of the original shares
of Preferred Stock and the Warrants in accordance with this Agreement;

         c. The accuracy in all material respects on the Closing Date of the
representations and warranties of the Company contained in this Agreement as if
made on the Closing Date, except for representation and warranties that are
expressly made as of a particular date, and the performance by the Company on or
before the Closing Date of all covenants, agreements and conditions of the
Company required by this Agreement, the Registration Rights Agreement, the
Escrow Agreement and the Warrants to be performed on or before the Closing Date;
and

                                      E-36

<PAGE>



         d. On the Closing Date, the Buyer having received an opinion of counsel
for the Company, dated as of such Closing Date, in form, scope and substance
reasonably satisfactory to the Buyer, to the effect set forth in Exhibit 4(q)
attached hereto, and the Registration Rights Agreement annexed hereto as Exhibit
4(e).

         e. The Company shall have obtained all permits and qualifications
required by any state for the offer and sale of the Preferred Stock and the
Warrants, or shall have the availability of exemptions therefrom. The sale and
issuance of the Preferred Stock and the Warrants shall be legally permitted by
all laws and regulations to which the Company is subject.

         f. No statute, rule, regulation, executive order, decree, ruling or
injunction shall have been enacted, entered, promulgated or endorsed by any
court or governmental authority of competent jurisdiction that materially
prohibits or directly, materially and adversely affects any of the transactions
contemplated by this Agreement, and no proceeding shall have been commenced that
may have the effect of materially prohibiting or adversely affecting any of the
transactions contemplated by this Agreement.

         g. The trading of the Common Stock is not suspended by the SEC, the
Nasdaq Small Cap Market or such other exchange, and the Common Stock shall have
been approved for listing or quotation on and shall not have been delisted from
the Nasdaq Small Cap Market. The issuance of shares of Preferred Stock and the
Warrants with respect to the applicable Closing, if any, shall not violate the
shareholder approval requirements of the Nasdaq Small Cap Market.

         h. The parties hereto shall have entered into the Escrow Agreement to
hold the Preferred Stock and the Warrants issuable upon the Closing Date and the
Purchase Prices due hereunder, which shall remain in full force and effect as of
the Closing Date.

         i. On the Closing Date the Company will deliver a certificate of an
officer of the Company confirming the satisfaction of the conditions set forth
in Sections 9(c) and (f) hereof; provided that the statements regarding
compliance with Section 9(f) shall be limited to rules, regulations, orders,
executive degrees, rulings, injunctions or proceedings applicable to the
Company.

         10.      GOVERNING LAW; SPECIFIC PERFORMANCE.

                  This Agreement shall be governed by and interpreted in
accordance with the laws of the State of New York without giving effect to the
principles thereof regarding the conflict of laws. Each of the parties consents
to the exclusive jurisdiction of the federal courts whose districts encompass
any part of the State of New York in connection with any dispute arising under
this Agreement and hereby waives, to the maximum extent permitted by law, any
objection, including any objection based on FORUM NON CONVENIENS, to the
bringing of any such proceeding in such jurisdictions. Each party waives its
right to a trial by jury. Each party to this Agreement irrevocably consents to
the service of process in any such proceeding by the mailing of copies thereof
by registered or certified mail, postage prepaid, to such party at its address
set forth herein. Nothing herein shall affect the right of any party to serve
process in any other manner permitted by law.

         11. NOTICES. Any notice required or permitted hereunder shall be given
in writing (unless otherwise specified herein) and shall be deemed effectively
given, (i) on the date delivered, (a) by personal delivery, or (b) if advance
copy is given by fax, (ii) seven business days after deposit in the United
States

                                      E-37

<PAGE>



Postal Service by regular or certified mail, or (iii) three business days
mailing by international express courier, with postage and fees prepaid,
addressed to each of the other parties thereunto entitled at the following
addresses, or at such other addresses as a party may designate by ten days
advance written notice to each of the other parties hereto.

COMPANY:                   XYBERNAUT CORPORATION
                           12701 Fair Lakes Circle, Suite 550
                           Fairfax, Virginia  22033
                           Attention:  Dr. Steven A. Newman, Vice Chairman
                           Telecopier No.:  (703) 631-6734

                           with a copy to:

                           Parker Chapin Flattau & Klimpl, LLP
                           1211 Avenue of the Americas
                           New York, New York  10036
                           Attention:  Martin Eric Weisberg, Esq.
                           Telecopier No.:  (212) 704-6288

BUYER:                     Forest Avenue  LLC
                           c/o Citco Trustees (Cayman) Limited
                           Commercial Centre
                           PO Box 31106 SMB
                           Grand Cayman
                           Cayman Islands
                           British West Indies
                           Attention: Bas Horsten
                           Telecopier No.: (345) 945-7566

                           with a copy to:

                           Krieger & Prager
                           319 Fifth Avenue
                           New York, New York 10016
                           Attention: Samuel M. Krieger, Esq.
                           Telecopier No.:  (212) 213-2077

ESCROW AGENT:              Parker Chapin Flattau & Klimpl, LLP
                           1211 Avenue of the America
                           New York, New York 10036
                           Telecopier No. (212) 704-6288

      12. SURVIVAL OF REPRESENTATIONS AND WARRANTIES. The Company's
representations and warranties shall survive the execution and delivery hereof
of this Agreement and the delivery of the Preferred Stock and the Purchase
Price, and shall inure to the benefit of the Buyer and their respective
successors and assigns. The Company's covenants set forth in Section 5 hereof
shall terminate

                                      E-38

<PAGE>



upon the redemption of all of the Preferred Stock in accordance with the
Company's Certificate of Designation for the Preferred Stock.

      13.         MISCELLANEOUS

      a. INDEMNIFICATION. The Company agrees to indemnify and hold harmless the
Buyer and each officer, director of the Buyer or person, if any, who controls
the Buyer within the meaning of the Securities Act against any losses, claims,
damages or liabilities, joint or several (which shall, for all purposes of this
Agreement, include, but not be limited to, all costs of defense and
investigation and all attorneys' fees), to which the Buyer may become subject,
under the Securities Act or otherwise, insofar as such losses, claims, damages
or liabilities (or actions in respect thereof) arise out of or are based upon
the breach of any term of this Agreement. This indemnity agreement will be in
addition to any liability which the Company may otherwise have.

      b. ASSIGNMENT.  The provisions of this Agreement shall be binding upon and
inure to the benefit of, the parties and their respective successors and
assigns.

      c. COUNTERPARTS; FACSIMILE; AMENDMENTS. This Agreement may be executed in
multiple counterparts, each of which may be executed by less than all of the
parties and shall be deemed to be an original instrument which shall be
enforceable against the parties actually executing such counterparts and all of
which together shall constitute one and the same instrument. Except as otherwise
stated herein, in lieu of the original documents, a facsimile transmission or
copy of the original documents shall be as effective and enforceable as the
original. This Agreement may be amended only by a writing executed by the
Company on the one hand, and the Buyer, on the other hand.

      d. ENTIRE AGREEMENT. This Agreement and the Exhibits, which include, but
are not limited to the Certificate of Designation, the Warrant, the Escrow
Agreement, and the Registration Rights Agreement, set forth the entire agreement
and understanding of the parties relating to the subject matter hereof and
supersedes all prior and contemporaneous agreements, negotiations and
understandings between the parties, both oral and written relating to the
subject matter hereof. The terms and conditions of all Exhibits and Schedules to
this Agreement are incorporated herein by this reference and shall constitute
part of this Agreement as is fully set forth herein.

      e. SEVERABILITY. In the event that any provision of this Agreement becomes
or is declared by a court of competent jurisdiction to be illegal, unenforceable
or void, this Agreement shall continue in full force and effect without said
provision; provided that such severability shall be ineffective if it materially
changes the economic benefit of this Agreement to any party

      f. TITLE AND SUBTITLES. The titles and subtitles used in this Agreement
are used for convenience only and are not to be considered in construing or
interpreting this Agreement.

      g. REPORTING ENTITY FOR THE COMMON STOCK. The reporting entity relied upon
for the determination of the trading price or trading volume of the Common Stock
on any given trading day for the purposes of this Agreement and all Exhibits
shall be Bloomberg, L.P. or any successor thereto. The written mutual consent of
the Buyer and the Company shall be required to employ any other reporting
entity.

                                      E-39

<PAGE>



      h. REPLACEMENT OF CERTIFICATES. Upon (i) receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of a
certificate representing the Preferred Stock, the Warrants, or shares of Common
Stock underlying the Preferred Stock or the Warrants, and (ii) in the case of
any such loss, theft or destruction of such certificate, upon delivery of an
indemnity agreement or security reasonably satisfactory in form and amount to
the Company or (iii) in the case of any such mutilation, on surrender and
cancellation of such certificate, the Company at its expense will execute and
deliver, in lieu thereof, a new certificate of like tenor.

      i. PUBLICITY. The Company and the Buyer shall consult with each other in
issuing any press releases or otherwise making public statements with respect to
the transactions contemplated hereby and no party shall issue any such press
release or otherwise make any such public statement without the prior written
consent of the other parties, which consent shall not be unreasonably withheld
or delayed, except that no prior consent shall be required if such disclosure is
required by law, in which such case the disclosing party shall provide the other
parties with prior notice of such public statement. Notwithstanding the
foregoing, the Company shall not publicly disclose the name of the Buyer without
the prior written consent of the Buyer, except to the extent required by law, in
which case the Company shall provide the Buyer with prior written notice of such
public disclosure.

         IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed by their respective officers thereunto duly authorized as of the date
first above written.


                                            XYBERNAUT CORPORATION


                                                  By:  /s/ Steven A. Newman
                                                       -------------------------
                                                  Name: Steven A. Newman
                                                  Title:   Vice Chairman


                                            FOREST AVENUE LLC


                                            By:
                                                 -------------------------------
                                                  Name:
                                                  Title:


                                      E-40


                                                                     EXHIBIT 4.2
                                                                     -----------

                                 FORM OF WARRANT

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT") OR ANY OTHER APPLICABLE STATE SECURITIES LAWS AND
HAS BEEN ISSUED IN RELIANCE UPON REGULATION D PROMULGATED UNDER THE SECURITIES
ACT. THIS WARRANT SHALL NOT CONSTITUTE AN OFFER TO SELL NOR A SOLICITATION OF AN
OFFER TO BUY THE WARRANT IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION
WOULD BE UNLAWFUL.

THIS WARRANT MAY NOT BE SOLD, PLEDGED, TRANSFERRED OR ASSIGNED EXCEPT PURSUANT
TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND UNDER
APPLICABLE STATE SECURITIES LAWS, OR IN A TRANSACTION WHICH IS EXEMPT FROM
REGISTRATION UNDER THE PROVISIONS OF THE SECURITIES ACT AND UNDER PROVISIONS OF
APPLICABLE STATE SECURITIES LAWS; AND IN THE CASE OF AN EXEMPTION, ONLY IF THE
COMPANY HAS RECEIVED AN OPINION OF COUNSEL THAT SUCH TRANSACTION DOES NOT
REQUIRE REGISTRATION OF THE WARRANT, WHICH OPINION AND WHICH COUNSEL SHALL BE
SATISFACTORY TO THE COMPANY IN ITS SOLE DISCRETION.

NO. SE-1
                                     WARRANT

                  To Purchase 50,000 Shares of Common Stock of

                              XYBERNAUT CORPORATION

         THIS CERTIFIES that, for value received, FOREST AVENUE LLC, a Cayman
Islands limited liability company (the "Holder"), is entitled, upon the terms
and subject to the conditions hereinafter set forth, at any time on or after May
11, 1999 and on or prior to May 11, 2002 (the "Termination Date") but not
thereafter, to subscribe for and purchase from XYBERNAUT CORPORATION, a
corporation incorporated in the State of Delaware (the "Company"), fifty
thousand (50,000) shares (the "Warrant Shares") of Common Stock, par value US
$0.01 per share of the Company (the "Common Stock"). The purchase price of one
share of Common Stock under this Warrant (the "Exercise Price") shall be equal
to one hundred and twenty-five percent (125%) of the closing bid price of the
Common Stock on the first trading day immediately preceding the Closing Date (as
such term is defined in the Securities Purchase Agreement dated as of May 11,
1999 (the "Agreement")) (the "Closing Price"). The Exercise Price and the number
of shares for which the Warrant is exercisable shall be subject to adjustment as
provided herein. This Warrant is being issued in connection with the Agreement,
and is subject to its terms and conditions. In the event of any conflict between
the terms of this Warrant and the Agreement, the Agreement shall control.

         1. Title of Warrant. Prior to the expiration hereof and subject to
compliance with applicable laws, this Warrant and all rights hereunder are
transferable, in whole or in part, at the office or agency of the Company by the
holder hereof in person or by duly authorized attorney, upon surrender of this
Warrant together with the Assignment Form annexed hereto properly endorsed.

                                      E-41

<PAGE>



         2. Authorization of Shares. The Company covenants that all shares of
Common Stock which may be issued upon the exercise of rights represented by this
Warrant will, upon exercise of the rights represented by this Warrant, be duly
authorized, validly issued, fully paid and nonassessable and free from all
taxes, liens and charges in respect of the issue thereof (other than taxes in
respect of any transfer occurring contemporaneously with such issue).

         3. Exercise of Warrant. Except as provided in Section 4 below, exercise
of the purchase rights represented by this Warrant may be made at any time or
times, before the close of business on the Termination Date, or such earlier
date on which this Warrant may terminate as provided in this Warrant, by the
surrender of this Warrant and the Notice of Exercise Form annexed hereto duly
executed, at the office of the Company (or such other office or agency of the
Company as it may designate by notice in writing to the registered holder hereof
at the address of such holder appearing on the books of the Company) and upon
payment of the Exercise Price of the shares thereby purchased; whereupon the
holder of this Warrant shall be entitled to receive a certificate for the number
of shares of Common Stock so purchased. Certificates for shares purchased
hereunder shall be delivered to the holder hereof within three (3) business days
after the date on which this Warrant shall have been exercised as aforesaid.
Payment of the Exercise Price of the shares may be by certified check or
cashier's check or by wire transfer to an account designated by the Company in
an amount equal to the Exercise Price multiplied by the number of Warrant
Shares.

         4. No Fractional Shares or Scrip. No fractional shares or scrip
representing fractional shares shall be issued upon the exercise of this
Warrant.

         5. Charges, Taxes and Expenses. Issuance of certificates for shares of
Common Stock upon the exercise of this Warrant shall be made without charge to
the holder hereof for any issue or transfer tax or other incidental expense in
respect of the issuance of such certificate, all of which taxes and expenses
shall be paid by the Company, and such certificates shall be issued in the name
of the holder of this Warrant or in such name or names as may be directed by the
holder of this Warrant; provided, however, that in the event certificates for
shares of Common Stock are to be issued in a name other than the name of the
holder of this Warrant, this Warrant when surrendered for exercise shall be
accompanied by the Assignment Form attached hereto duly executed by the holder
hereof; and provided further, that upon any transfer involved in the issuance or
delivery of any certificates for shares of Common Stock, the Company may
require, as a condition thereto, the payment of a sum sufficient to reimburse it
for any transfer tax incidental thereto.

         6. Closing of Books. The Company will not close its shareholder books
or records in any manner which prevents the timely exercise of this Warrant for
a period of time in excess of five (5) trading days per year.

         7. No Rights as Shareholder until Exercise. This Warrant does not
entitle the holder hereof to any voting rights or other rights as a shareholder
of the Company prior to the exercise thereof. Upon the surrender of this Warrant
and the payment of the aggregate Exercise Price, the Warrant Shares so purchased
shall be and be deemed to be issued to such holder as the record owner of such
shares as of the close of business on the later of the date of such surrender or
payment.

         8. Assignment and Transfer of Warrant. This Warrant may be assigned by
the surrender of this Warrant and the Assignment Form annexed hereto duly
executed at the office of the Company (or such

                                      E-42

<PAGE>



other office or agency of the Company as it may designate by notice in writing
to the registered holder hereof at the address of such holder appearing on the
books of the Company).

         9. Loss, Theft, Destruction or Mutilation of Warrant. The Company
represents and warrants that upon receipt by the Company of evidence reasonably
satisfactory to it of the loss, theft, destruction or mutilation of this Warrant
certificate or any stock certificate relating to the Warrant Shares, and in case
of loss, theft or destruction, of indemnity or security reasonably satisfactory
to it, and upon surrender and cancellation of such Warrant or stock certificate,
if mutilated, the Company will make and deliver a new Warrant or stock
certificate of like tenor and dated as of such cancellation, in lieu of such
Warrant or stock certificate.

         10. Saturdays, Sundays, Holidays, etc. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday, Sunday or a legal holiday, then such action may be
taken or such right may be exercised on the next succeeding day not a legal
holiday.

         11. Registration. The Company agrees that the Warrant Shares shall be
included in the Registration Statement to be filed by the Company pursuant to
the Registration Rights Agreement dated as of May 11, 1999.

         12. Adjustments of Exercise Price and Number of Warrant Shares. The
number and kind of securities purchasable upon the exercise of this Warrant and
the Exercise Price shall be subject to adjustment from time to time upon the
happening of any of the following.

                  In the event of a Redemption (as defined in the Certificate of
Designation of Series E Preferred Stock) by the Company in accordance with
Section 5 of the Certificate of Designation, the Exercise Price of a pro rata
amount of the Warrants (the "Adjusted Warrants" (as calculated hereinafter)
shall be reduced to one hundred fifteen (115%) percent of the Closing Price. For
purposes of this section, "Adjusted Warrants" shall equal the product of (i) the
Warrant Shares and (ii) the quotient of (A) the number of shares of Series E
Preferred Stock redeemed and (B) the total number of Series E Preferred Stock
issued.

                  In case the Company shall (i) declare or pay a dividend in
shares of Common Stock or make a distribution in shares of Common Stock to
holders of its outstanding Common Stock, (ii) subdivide its outstanding shares
of Common Stock, (iii) combine its outstanding shares of Common Stock into a
smaller number of shares of Common Stock or (iv) issue any shares of its capital
stock in a reclassification of the Common Stock, then the number of Warrant
Shares purchasable upon exercise of this Warrant immediately prior thereto shall
be adjusted so that the holder of this Warrant shall be entitled to receive the
kind and number of Warrant Shares or other securities of the Company which he
would have owned or have been entitled to receive had such Warrant been
exercised in advance thereof. Upon each such adjustment of the kind and number
of Warrant Shares or other securities of the Company which are purchasable
hereunder, the holder of this Warrant shall thereafter be entitled to purchase
the number of Warrant Shares or other securities resulting from such adjustment
at an Exercise Price per such Warrant Share or other security obtained by
multiplying the Exercise Price in effect immediately prior to such adjustment by
the number of Warrant Shares purchasable pursuant hereto immediately prior to
such adjustment and dividing by the number of Warrant Shares or other securities
of the Company resulting from such adjustment.

                                      E-43

<PAGE>



                  An adjustment made pursuant to this section 12 shall become
effective immediately after the effective date of such event retroactive to the
record date, if any, for such event.

         13. Voluntary Adjustment by the Company. The Company may at any time
during the term of this Warrant, reduce the then current Exercise Price to any
amount and for any period of time deemed appropriate by the Board of Directors
of the Company.

         14. Notice of Adjustment. Whenever the number of Warrant Shares or
number or kind of securities or other property purchasable upon the exercise of
this Warrant or the Exercise Price is adjusted, as herein provided, the Company
shall promptly mail by registered or certified mail, return receipt requested,
to the holder of this Warrant notice of such adjustment or adjustments setting
forth the number of Warrant Shares (and other securities or property)
purchasable upon the exercise of this Warrant and the Exercise Price of such
Warrant Shares (and other securities or property) after such adjustment, setting
forth a brief statement of the facts requiring such adjustment and setting forth
the computation by which such adjustment was made. Such notice, in absence of
manifest error, shall be conclusive evidence of the correctness of such
adjustment.

         15. Authorized Shares. The Company covenants that during the period the
Warrant is outstanding, it will reserve from its authorized and unissued Common
Stock a sufficient number of shares to provide for the issuance of the Warrant
Shares upon the exercise of any purchase rights under this Warrant. The Company
further covenants that its issuance of this Warrant shall constitute full
authority to its officers who are charged with the duty of executing stock
certificates to execute and issue the necessary certificates for the Warrant
Shares upon the exercise of the purchase rights under this Warrant. The Company
will take all such reasonable action as may be necessary to assure that such
Warrant Shares may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of the NASDAQ Small Cap
Stock Market or any domestic securities exchange upon which the Common Stock may
be listed.

         16. Warrant Call. At any time after the Registration Statement is
declared effective, the Company, at its option, may, upon written notice to the
Holder (the "Call Notice"), call (x) up to fifty (50%) percent of this Warrant
at a price per Warrant Share equal to the Exercise Price if the Common Stock of
the Company trades at a price equal to or greater than two hundred (200%)
percent of the Closing Price for twenty (20) consecutive trading days prior to
the date the Company calls the Warrant and (y) up to fifty (50%) percent of this
Warrant at a price per Warrant Share equal to the Exercise Price if the Common
Stock of the Company trades at a price equal to or greater than two hundred
fifty (250%) percent of the Closing Price for twenty (20) consecutive trading
days prior to the date the Company calls the Warrant. To be effective, the Call
Notice must be given within three (3) days after the aforementioned twenty (20)
day periods. The rights and privileges granted pursuant to this Warrant shall
terminate thirty (30) days after the Call Notice is sent to the Holder if the
Warrant is not exercised during that period. In the event the Warrants are not
exercised during this period the Company will remit to the Holder $0.01 per
Warrant Share upon the Holder tendering to the Company the expired Warrant
certificate.

                  17.      Miscellaneous.

                  (a) Issue Date; Jurisdiction. The provisions of this Warrant
shall be construed and shall be given effect in all respects as if it had been
issued and delivered by the Company on the date hereof. This Warrant shall be
binding upon any successors or assigns of the Company. This Warrant shall

                                      E-44

<PAGE>



constitute a contract under the laws of New York without regard to its conflict
of law, principles or rules, and be subject to arbitration pursuant to the terms
set forth in the Agreement.

                  (b) Restrictions. The holder hereof acknowledges that the
Warrant Shares acquired upon the exercise of this Warrant, if not registered,
will have restrictions upon resale imposed by state and federal securities laws.
Each certificate representing the Warrant Shares issued to the Holder upon
exercise will bear the following legend:



                  THESE SECURITIES (THE "SECURITIES") HAVE NOT BEEN REGISTERED
                  UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
                  ACT"), OR THE SECURITIES LAWS OF ANY STATE AND MAY NOT BE SOLD
                  OR OFFERED FOR SALE EXCEPT PURSUANT TO AN EFFECTIVE
                  REGISTRATION STATEMENT FOR THE SECURITIES OR AN OPINION OF
                  COUNSEL OR OTHER EVIDENCE ACCEPTABLE TO THE CORPORATION THAT
                  SUCH REGISTRATION IS NOT REQUIRED.

         (c) Modification and Waiver. This Warrant and any provisions hereof may
be changed, waived, discharged or terminated only by an instrument in writing
signed by the party against which enforcement of the same is sought.

         (d) Notices. Any notice, request or other document required or
permitted to be given or delivered to the holders hereof by the Company shall be
delivered or shall be sent by certified or registered mail, postage prepaid, to
each such holder at its address as shown on the books of the Company or to the
Company at the address set forth in the Agreement.

                  IN WITNESS WHEREOF, the Company has caused this Warrant to be
executed by its officer thereunto duly authorized.

Dated: May        , 1999


                                             XYBERNAUT CORPORATION


                                             By /s/ Steven A. Newman
                                                --------------------------------
                                                  Name: Steven A. Newman
                                                  Title:   Vice Chairman


                                      E-45

<PAGE>



                               NOTICE OF EXERCISE


To:      XYBERNAUT CORPORATION



                  (1) The undersigned  hereby elects to purchase ________ shares
of Common  Stock,  par  value $  ________  per share  (the  "Common  Stock")  of
XYBERNAUT CORPORATION pursuant to the terms of the attached Warrant, and tenders
herewith  payment of the exercise  price in full,  together with all  applicable
transfer taxes, if any.

                  (2) In exercising this Warrant, the undersigned hereby
confirms and acknowledges that the shares of Common Stock are being acquired
solely for the account of the undersigned and not as a nominee for any other
party, and for investment, and that the undersigned will not offer sell or
otherwise dispose of any such shares of Common Stock, except under circumstances
that will not result in a violation of the United States Securities Act of 1933,
as amended, or any foreign or state securities laws.

                  (3) Please issue a certificate or certificates representing
said shares of Common Stock in the name of the undersigned or in such other name
as is specified below:

                           -------------------------------
                           (Name)

                           -------------------------------
                           (Address)
                           -------------------------------

                  (4) The shares of Common Stock being issued in connection with
the exercise of the attached Warrant are being issued in connection with the
sale of the Common Stock.


Dated:


                                          ------------------------------
                                          Signature


                                      E-46

<PAGE>



                                 ASSIGNMENT FORM

(To assign the foregoing warrant, execute this form and supply required
information. Do not use this form to exercise the warrant.)



                  FOR VALUE RECEIVED, the foregoing Warrant and all rights
evidenced thereby are hereby assigned to

_______________________________________________ whose address is

- ---------------------------------------------------------------.



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

                                                       Dated:  ______________


                           Holder's Signature: ____________________________

                           Holder's Address:   ____________________________

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



Signature Guaranteed:  ___________________________________________




NOTE: The signature to this Assignment Form must correspond with the name as it
appears on the face of the Warrant, without alteration or enlargement or any
change whatsoever, and must be guaranteed by a bank or trust company. Officers
of corporations and those acting in an fiduciary or other representative
capacity should file proper evidence of authority to assign the foregoing
Warrant.

                                      E-47


                                                                       EXHIBIT 5
                                                                       ---------



                                  June 14, 1999



Xybernaut Corporation
12701 Fair Lakes Circle
Fairfax, Virginia  22033

Gentlemen:

         We have acted as counsel to Xybernaut Corporation, a Delaware
corporation (the "Company"), in connection with a Registration Statement on Form
S-3 (the "Registration Statement") being filed with the Securities and Exchange
Commission under the Securities Act of 1933, as amended, relating to the
offering of 1,341,074 shares (the "Shares") of Common Stock, par value $.01 per
share (the "Common Stock"), which includes 182,482 shares issuable upon
conversion of 500 shares of the Company's Series D Preferred Stock and 1,083,591
shares issuable upon conversion of the Company's Series E Preferred Stock
(collectively, the "Conversion Shares"), par value $.01 per share and 75,000
shares issuable upon exercise of outstanding warrants (the "Warrant Shares").
The Warrant Shares and the Conversion Shares are collectively referred to herein
as the "Shares."

          In connection with the foregoing, we have examined originals or
copies, satisfactory to us, of the Company's (i) Certificate of Incorporation,
(ii) By-laws and (iii) resolutions of the Company's board of directors. We have
also reviewed such other matters of law and examined and relied upon all such
corporate records, agreements, certificates and other documents as we have
deemed relevant and necessary as a basis for the opinion hereinafter expressed.
In such examination, we have assumed the genuineness of all signatures, the
authenticity of all documents submitted to us as originals and the conformity
with the original documents of all documents submitted to us as copies or
facsimiles. As to any facts material to such opinion, we have, to the extent
that relevant facts were not independently established by us, relied on
certificates of public officials and certificates of officers or other
representatives of the Company.

         Based upon and subject to the foregoing, we are of the opinion that the
Shares, when issued upon conversion of the Series D and E Preferred Stock and
the Warrants, as applicable, will be validly issued, fully paid and
non-assessable.

         We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement.


                                            Very truly yours,

                                         /s/ Parker Chapin Flattau & Klimpl, LLP
                                         ---------------------------------------
                                             PARKER CHAPIN FLATTAU & KLIMPL, LLP


                                      E-48


                                                                    EXHIBIT 10.1
                                                                    ------------



                      FORM OF REGISTRATION RIGHTS AGREEMENT

                  THIS REGISTRATION RIGHTS AGREEMENT, dated as of May 11, 1999
(this "Agreement"), is made by and between XYBERNAUT CORPORATION, a Delaware
corporation (the "Company"), and FOREST AVENUE LLC, a Cayman Islands limited
liability company (the "Investor").

                              W I T N E S S E T H:

                  WHEREAS, upon the terms and subject to the conditions of the
Securities Purchase Agreement, dated as of May 11, 1999, by and between the
Investor and the Company (the "Securities Purchase Agreement"), the Company has
agreed to issue and sell to the Investor shares of Series E Preferred Stock of
the Company, in an aggregate principal amount not exceeding $2,000,000
(collectively, the "Preferred Stock"), which Preferred Stock will be convertible
into shares of the common stock, $.01 par value (the "Common Stock"), of the
Company (the "Conversion Shares") upon the terms and subject to the conditions
of the Certificate of Designation (as defined in the Securities Purchase
Agreement), and warrants to purchase up to 50,000 shares of Common Stock (the
"Warrants"), which Warrants will be exercisable into shares of Common Stock (the
"Warrant Shares"); and

                  WHEREAS, to induce the Investor to execute and deliver the
Securities Purchase Agreement, the Company has agreed to provide certain
registration rights under the Securities Act of 1933, as amended, and the rules
and regulations thereunder, or any similar successor statute (collectively, the
"Securities Act"), with respect to the Conversion Shares and Warrant Shares;

                  NOW, THEREFORE, in consideration of the premises and the
mutual covenants contained herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Company and the
Investor hereby agree as follows:

                  1.    DEFINITIONS.

                  (a) As used in this Agreement, the following terms shall have
the following meanings:

                        (i) "Investor" means the Investor and any permitted
transferee or assignee who agrees to become bound by the provisions of this
Agreement in accordance with Section 9 hereof.

                        (ii) "Potential Material Event" means any of the
following: (a) the possession by the Company of material information not ripe
for disclosure in a registration statement, which shall be evidenced by
determinations in good faith by the Board of Directors of the Company that
disclosure of such information in the registration statement would be
detrimental to the business and affairs of the Company; or (b) any material
engagement or activity by the Company which would, in the good faith
determination of the Board of Directors of the Company, be adversely affected by
disclosure in a registration statement at such time, which determination shall
be accompanied by a good faith determination by the Board of Directors of the
Company that the registration statement would be materially misleading absent
the inclusion of such information.

                                      E-49

<PAGE>


                        (iii) "Register," "Registered," and "Registration" refer
to registration effected by preparing and filing a Registration Statement or
Statements in compliance with the Securities Act and pursuant to Rule 415 under
the Securities Act or any successor rule providing for offering securities on a
continuous basis ("Rule 415"), and the declaration or ordering of effectiveness
of such Registration Statement by the United States Securities and Exchange
Commission (the "SEC").

                        (iv) "Registrable Securities" means the Conversion
Shares and the Warrant Shares.

                        (v) "Registration Statement" means a registration
statement of the Company under the Securities Act.

                  (b) Capitalized terms used herein and not otherwise defined
herein shall have the respective meanings set forth in the Securities Purchase
Agreement.

                  2.    REGISTRATION.

                  (A) MANDATORY REGISTRATION. The Company shall prepare and file
with the SEC, as soon as possible after the Closing Date (as defined in the
Securities Purchase Agreement) but in no event no later than thirty (30) days
following the Closing Date, either a Registration Statement on Form SB-1, SB-2
or S-3, as applicable, registering for resale by the Investor a sufficient
number of shares of Common Stock for the Investor (or such lesser number as may
be required by the SEC in writing, but in no event less than 150% of the
aggregate number of shares into (i) which the Preferred Stock would be
convertible at the time of filing of the Form SB-1, SB-2 or S-3, as applicable,
or an amendment to any pending Company Registration Statement on Form SB-1, SB-2
or S-3, as applicable (assuming for such purposes that all shares of Preferred
Stock had been eligible to be converted, and had been converted, in accordance
with their terms, whether or not such eligibility or conversion had in fact
occurred as of such date), and (ii) which would be issued upon exercise of all
of the Warrants at the time of filing of the Form SB-1, SB-2 or S-3, as
applicable (assuming for such purposes that all Warrants had been eligible to be
exercised and had been exercised in accordance with their terms, whether or not
such eligibility or exercise had in fact occurred as of such date), or an
amendment to any pending Company Registration Statement on Form SB-1, SB-2 or
S-3, as applicable, and such Registration Statement or amended Registration
Statement shall state that, in accordance with Rule 457 under the Securities
Act, it also covers such indeterminate number of additional shares of Common
Stock as may become issuable upon conversion of the Preferred Stock and the
exercise of the Warrants resulting from adjustment in the Conversion Price, or
to prevent dilution resulting from stock splits, or stock dividends), and the
Company shall use its best efforts to cause the Registration Statement to be
declared effective no later than ninety 90 days after the Closing Date. If the
Company is notified orally or in writing by the SEC that the SEC has no comments
with respect to the Registration Statement (the "SEC Notice"), the Company shall
use its best efforts to cause the Registration Statement to be declared
effective no later than five (5) business days after receipt of the SEC Notice.
If at any time after the Registration Statement has been filed the closing bid
price is less than $3 per share for at least three (3) consecutive days during
any twenty (20) day trading period, the Company shall within ten (10) business
days thereafter either (i) amend the Registration Statement filed by the Company
pursuant to the preceding sentence, if such Registration Statement has not been
declared effective by the SEC at that time, to register one hundred-fifty
percent (150%)of the shares of Common Stock into which the Preferred Stock based
on the closing bid price at the time of filing of such amendment may currently
or in the future be converted and which would be issued currently or in the
future upon exercise of the Warrants, or (ii)

                                      E-50

<PAGE>



if such Registration Statement has been declared effective by the SEC at that
time, file with the SEC an additional Registration Statement on Form SB-1, SB-2
or S-3, as applicable, to register 150% of the shares of Common Stock into which
the Preferred Stock based on the closing bid price at the time of filing an
additional Registration Statement may be converted and which would be issued
upon exercise of the Warrants that exceed the aggregate number of shares of
Common Stock already registered.

                  (B)   PAYMENTS BY THE COMPANY.

                        (i) If the Registration Statement covering the
Registrable Securities required to be filed by the Company pursuant to Section
2(a) hereof has not been filed within thirty (30) days from the Closing Date
(the "Required Filing Date") and/or has not been declared effective by the
earlier of (i) five (5) business days after the Company receives the SEC Notice
and (ii) ninety (90) days following the Closing Date (the "Required Effective
Date") (except as provided by the last sentence of Section 2(a) with respect to
the registration of additional shares of Common Stock), then the Company will
make payments to the Investor in such amounts and at such times as shall be
determined pursuant to this Section 2(b).

                        (ii) The amount to be paid by the Company to the
Investor as liquidated damages for such failure and not as a penalty shall be
equal to one percent (1%) of the purchase price paid by the Investor for all
shares of Series E Preferred Stock purchased and then outstanding pursuant to
the Securities Purchase Agreement for the initial thirty (30) day period until
the Registration Statement has been filed and/or declared effective, which shall
be pro rated for such periods less than thirty (30) days and two percent (2%) of
the purchase price paid by the Investor for each thirty (30) day period
thereafter until the Registration Statement has been filed and/or declared
effective (which shall be also pro rated, as aforesaid) (the "Periodic Amount").
The liquidated damages shall be paid by the Company in cash upon demand.

                        (iii) The parties acknowledge that the damages which may
be incurred by the Investor if the Registration Statement is not filed by the
Required Filing Date or if the Registration Statement has not been declared
effective by the Required Effective Date may be difficult to ascertain. The
parties agree that the Periodic Amount represents a reasonable estimate on the
part of the parties, as of the date of this Agreement, of the amount of such
damages.

                        (iv) Notwithstanding the foregoing, the amounts payable
by the Company pursuant to this provision shall not be payable to the extent any
delay in the effectiveness of the Registration Statement occurs because of an
act of, or a failure to act or to act timely by the Investor or its counsel, or
as a result of force majeure, or in the event all of the Registrable Securities
may be sold pursuant to Rule 144 (without volume limitation) or another
available exemption under the Act. The payment of such liquidated damages shall
not relieve the Company from its obligations to register the Registrable
Securities. If the Company does not pay the liquidated damages in a timely
fashion set forth herein, it will pay to the Investor the reasonable costs of
collection, including attorneys fees, in addition to the liquidated damages.

                  3. OBLIGATIONS OF THE COMPANY. In connection with the
registration of the Registrable Securities, the Company shall do each of the
following.

                  (a) Prepare promptly and file with the SEC not later than
thirty (30) days after the Closing Date, a Registration Statement with respect
to not less than the number of Registrable Securities provided in Section 2(a),
above, and thereafter use its best efforts to cause each Registration Statement
relating to

                                      E-51

<PAGE>



Registrable Securities to become effective the earlier of (i) five (5) business
days after receipt of the SEC Notice and (ii) ninety (90) days after the Closing
Date, and keep the Registration Statement effective at all times until the
earliest (the "Registration Period") of (i) the date that is two years after the
last Closing Date, (ii) the date when the Investor may sell all Registrable
Securities pursuant to Rule 144 under the Securities Act (without volume
limitation) or (iii) the date the Investor no longer own any of the Registrable
Securities, which Registration Statement (including any amendments or
supplements thereto and prospectuses contained therein) shall not contain any
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein, in light of the
circumstances in which they were made, not misleading;

                  (b) Prepare and file with the SEC such amendments (including
post-effective amendments) and supplements to the Registration Statement and the
prospectus used in connection with the Registration Statement as may be
necessary to keep the Registration effective at all times during the
Registration Period, and, during the Registration Period, comply with the
provisions of the Securities Act with respect to the disposition of all
Registrable Securities of the Company covered by the Registration Statement
until such time as all of such Registrable Securities have been disposed of in
accordance with the intended methods of disposition by the seller or sellers
thereof as set forth in the Registration Statement;

                  (c) The Company shall permit a single firm of counsel
designated by the Investor to review the Registration Statement and all
amendments and supplements thereto a reasonable period of time (but not less
than three (3) business days) prior to their filing with the SEC, and not file
any document in a form to which such counsel reasonably objects.

                  (d) Furnish to the Investor whose Registrable Securities are
included in the Registration Statement and its legal counsel identified to the
Company, (i) promptly after the same is prepared and publicly distributed, filed
with the SEC, or received by the Company, one (1) copy of the Registration
Statement, each preliminary prospectus and prospectus, and each amendment or
supplement thereto, and (ii) such number of copies of a prospectus, and all
amendments and supplements thereto and such other documents, as the Investor may
reasonably request in order to facilitate the disposition of the Registrable
Securities owned by such Investor;

                  (e) As promptly as practicable after becoming aware of such
event, but in no event later than one (1) business day thereafter, notify the
Investor of the happening of any event of which the Company has knowledge, as a
result of which the prospectus included in the Registration Statement, as then
in effect, includes an untrue statement of a material fact or omits to state a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading, and promptly (but in no event later than ten (10) business days
after knowledge of such event) prepare and file a supplement or amendment to the
Registration Statement or other appropriate filing with the SEC to correct such
untrue statement or omission, and deliver a number of copies of such supplement
or amendment to the Investor as the Investor may reasonably request;

                  (f) As promptly as practicable after becoming aware of such
event, but in no event later than one (1) business day thereafter, notify the
Investor who holds Registrable Securities being sold (or, in the event of an
underwritten offering, the managing underwriters) of the issuance by the SEC of
a Notice of Effectiveness or any notice of effectiveness or any stop order or
other suspension of the effectiveness of the Registration Statement at the
earliest possible time;

                                      E-52

<PAGE>


                  (g) Notwithstanding the foregoing, if at any time or from time
to time after the date of effectiveness of the Registration Statement, the
Company notifies the Investor in writing of the existence of a Potential
Material Event, the Investor shall not offer or sell any Registrable Securities,
or engage in any other transaction involving or relating to the Registrable
Securities, from the time of the giving of notice with respect to a Potential
Material Event until the Investor receives written notice from the Company that
such Potential Material Event either has been disclosed to the public or no
longer constitutes a Potential Material Event; provided, however, that the
Company may not so suspend the right to such holders of Registrable Securities
for more than two twenty (20) day periods in the aggregate during any 12-month
period (the "Suspension Period") with at least a ten (10) business day interval
between such periods, during the periods the Registration Statement is required
to be in effect;

                  (h) Use its reasonable efforts to secure designation of all
the Registrable Securities covered by the Registration Statement as a National
Association of Securities Dealers Automated Quotations System ("NASDAQ") "Small
Capitalization" within the meaning of Rule 11Aa2-1 of the SEC under the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the
quotation of the Registrable Securities on the NASDAQ SmallCap Market; or if,
despite the Company's reasonable efforts to satisfy the preceding clause, the
Company is unsuccessful in doing so, to secure NASDAQ/OTC Bulletin Board
authorization and quotation for such Registrable Securities and, without
limiting the generality of the foregoing, to arrange for at least two market
makers to register with the National Association of Securities Dealers, Inc.
("NASD") as such with respect to such Registrable Securities;

                  (i) Provide a transfer agent and registrar, which may be a
single entity, for the Registrable Securities not later than the effective date
of the Registration Statement;

                  (j) Cooperate with the Investor who holds Registrable
Securities being offered to facilitate the timely preparation and delivery of
certificates for the Registrable Securities to be offered pursuant to the
Registration Statement and enable such certificates for the Registrable
Securities to be in such denominations or amounts as the case may be, as the
Investor may reasonably request, and, within three (3) business days after a
Registration Statement which includes Registrable Securities is ordered
effective by the SEC, the Company shall deliver, and shall cause legal counsel
selected by the Company to deliver, to the transfer agent for the Registrable
Securities (with copies to the Investor whose Registrable Securities are
included in such Registration Statement) an appropriate instruction and opinion
of such counsel;

                  (k) Take all other reasonable actions necessary to expedite
and facilitate disposition by the Investor of the Registrable Securities
pursuant to the Registration Statement;

                  (l) The Company shall register and qualify the securities
covered by the Registration Statement under such other securities or blue sky
laws of such jurisdictions as the Investor shall reasonably request, and do any
and all other acts and things which may be necessary or advisable to enable each
Investor to consummate the public sale or other disposition in such jurisdiction
of the securities owned by such Investor;

                  (m) As promptly as practicable after becoming aware of such
event, but in no event later than one (1) business day thereafter, the Company
shall notify the Investor in writing of (x) the issuance by the SEC of a stop
order suspending the effectiveness of the Registration Statement, (y) the
happening of any event of which the Company has knowledge as a result of which
the prospectus included in the

                                      E-53

<PAGE>



Registration Statement, as then in effect, includes an untrue statement of a
material fact or omits to state a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading, or (z) the occurrence or existence of any
pending corporate development that, in the reasonable discretion of the Company,
makes it appropriate to suspend the availability of the Registration Statement,
and promptly to prepare and file a supplement or amendment to the Registration
Statement to correct such untrue statement or omission, and deliver two (2)
copies of such supplement or amendment to the Investor or such additional copies
as the Investor may reasonably request; provided that, for not more than twenty
(20) days (or a total of not more than forty-five (45) days in any twelve (12)
month period, the Company may delay the disclosure of material non-public
information concerning the Company (as well as prospectus or Registration
Statement updating) the disclosure of which at the time is not, in the good
faith opinion of the Company, the best interests of the Company and in the
opinion of counsel to the Company (an "Allowed Delay"); provided, further, that
the Company shall promptly (i) notify the Investor in writing of the existence
of material non-public information giving rise to an Allowed Delay and (ii)
advise the Investor in writing to cease all sales under the Registration
Statement until the end of the Allowed Delay. Upon expiration of the Allowed
Delay, the Company shall again be bound by the first sentence of this Section
3(m) with respect to the information giving rise thereto, and shall be obligated
to pay to the Investor any amounts provided for in Section 2(b).

                  4. OBLIGATIONS OF THE INVESTOR. In connection with the
registration of the Registrable Securities, the Investor shall have the
following obligations:

                  (a) It shall be a condition precedent to the obligations of
the Company to complete the registration pursuant to this Agreement with respect
to the Registrable Securities of the Investor that such Investor shall furnish
to the Company such information regarding itself, the Registrable Securities
held by it, and the intended method of disposition of the Registrable Securities
held by it, as shall be reasonably requested by the Company in writing to effect
the registration of such Registrable Securities and shall execute such documents
in connection with such registration as the Company may reasonably request. At
least seven (7) business days prior to the first anticipated filing date of the
Registration Statement, the Company shall notify the Investor of the information
the Company requires from such Investor (the "Requested Information"). If at
least two (2) business days prior to the filing date of the Registration
Statement the Company has not received the Requested Information from an
Investor (a "Non-Responsive Investor"), then the Company may file the
Registration Statement without including Registrable Securities of such
Non-Responsive Investor;

                  (b) The Investor by its acceptance of the Registrable
Securities agrees to cooperate with the Company as reasonably requested by the
Company in connection with the preparation and filing of the Registration
Statement hereunder, unless the Investor has notified the Company in writing of
the Investor's election to exclude all of the Investor's Registrable Securities
from the Registration Statement; and

                  (c) The Investor agrees that, upon receipt of any notice from
the Company of the happening of any event of the kind described in Section 3(e),
3(f) or 3(l), above, the Investor will immediately discontinue disposition of
Registrable Securities pursuant to the Registration Statement covering such
Registrable Securities until the Investor's receipt of the copies of the
supplemented or amended prospectus contemplated by Section 3(e), 3(f) or 3(l)
and, if so directed by the Company, the Investor shall deliver to the Company
(at the expense of the Company) or destroy (and deliver to the Company a
certificate of destruction) all copies in the Investor's possession, of the
prospectus covering such Registrable Securities current at the time of receipt
of such notice.

                                      E-54

<PAGE>



                  5. EXPENSES OF REGISTRATION. All reasonable expenses, other
than underwriting discounts and commissions incurred in connection with
registrations, filings or qualifications pursuant to Section 3, but including,
without limitation, all registration, listing, and qualifications fees, printers
and accounting fees, the fees and disbursements of counsel for the Company,
shall be borne by the Company.

                  6. INDEMNIFICATION. In the event any Registrable Securities
are included in a Registration Statement under this Agreement:

                  (a) To the extent permitted by law, the Company will indemnify
and hold harmless the Investor who holds such Registrable Securities, the
directors, if any, of such Investor, the officers and agents, if any, of such
Investor, each person, if any, who controls any Investor within the meaning of
the Securities Act or the Exchange Act (each, an "Indemnified Person" or
"Indemnified Party"), against any losses, claims, damages, liabilities or
expenses (joint or several) incurred (collectively, "Claims") to which any of
them may become subject under the Securities Act, the Exchange Act or otherwise,
insofar as such Claims (or actions or proceedings, whether commenced or
threatened, in respect thereof) arise out of or are based upon any of the
following statements, omissions or violations in the Registration Statement, or
any post-effective amendment thereof, or any prospectus included therein: (i)
any untrue statement or alleged untrue statement of a material fact contained in
the Registration Statement or any post-effective amendment thereof or the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, (ii)
any untrue statement or alleged untrue statement of a material fact contained in
the final prospectus (as amended or supplemented, if the Company files any
amendment thereof or supplement thereto with the SEC) or the omission or alleged
omission to state therein any material fact necessary to make the statements
made therein, in light of the circumstances under which the statements therein
were made, not misleading or (iii) any violation or alleged violation by the
Company of the Securities Act, the Exchange Act, any state securities law or any
rule or regulation under the Securities Act, the Exchange Act or any state
securities law (the matters in the foregoing clauses (i) through (iii) being,
collectively, "Violations"). Subject to clause (b) of this Section 6, the
Company shall reimburse the Investor, promptly as such expenses are incurred and
are due and payable, for any legal fees or other reasonable expenses incurred by
them in connection with investigating or defending any such Claim.
Notwithstanding anything to the contrary contained herein, the indemnification
agreement contained in this Section 6(a) shall not (I) apply to a Claim arising
out of or based upon a Violation which occurs in reliance upon and in conformity
with information furnished in writing to the Company by or on behalf of any
Indemnified Person expressly for use in connection with the preparation of the
Registration Statement or any such amendment thereof or supplement thereto, if
such prospectus was timely made available by the Company pursuant to Section
3(c) hereof; (II) be available to the extent such Claim is based on a failure of
the Investor to deliver or cause to be delivered the prospectus made available
by the Company; or (III) apply to amounts paid in settlement of any Claim if
such settlement is effected without the prior written consent of the Company,
which consent shall not be unreasonably withheld. The Investor will indemnify
the Company and its officers, directors and agents against any claims arising
out of or based upon a Violation which occurs in reliance upon and in conformity
with information furnished in writing to the Company, by or on behalf of the
Investor, expressly for use in connection with the preparation of the
Registration Statement, subject to such limitations and conditions as are
applicable to the Indemnification provided by the Company to this Section 6.
Such indemnity shall remain in full force and effect regardless of any
investigation made by or on behalf of the Indemnified Person and shall survive
the transfer of the Registrable Securities by the Investor pursuant to Section
9.

                                      E-55

<PAGE>


                  (b) Promptly after receipt by an Indemnified Person or
Indemnified Party under this Section 6 of notice of the commencement of any
action (including any governmental action), such Indemnified Person or
Indemnified Party shall, if a Claim in respect thereof is to be made against any
indemnifying party under this Section 6, deliver to the indemnifying party a
written notice of the commencement thereof and the indemnifying party shall have
the right to participate in, and, to the extent the indemnifying party so
desires, jointly with any other indemnifying party similarly noticed, to assume
control of the defense thereof with counsel mutually satisfactory to the
indemnifying party and the Indemnified Person or the Indemnified Party, as the
case may be. In case any such action is brought against any Indemnified Person
or Indemnified Party, and it notifies the indemnifying party of the commencement
thereof, the indemnifying party will be entitled to participate in, and, to the
extent that it may wish, jointly with any other indemnifying party similarly
notified, assume the defense thereof, subject to the provisions herein stated
and after notice from the indemnifying party to such Indemnified Person or
Indemnified Party of its election so to assume the defense thereof, the
indemnifying party will not be liable to such Indemnified Person or Indemnified
Party under this Section 6 for any legal or other reasonable out-of-pocket
expenses subsequently incurred by such Indemnified Person or Indemnified Party
in connection with the defense thereof other than reasonable costs of
investigation, unless the indemnifying party shall not pursue the action of its
final conclusion. The Indemnified Person or Indemnified Party shall have the
right to employ separate counsel in any such action and to participate in the
defense thereof, but the fees and reasonable out-of-pocket expenses of such
counsel shall not be at the expense of the indemnifying party if the
indemnifying party has assumed the defense of the action with counsel reasonably
satisfactory to the Indemnified Person or Indemnified Party. The failure to
deliver written notice to the indemnifying party within a reasonable time of the
commencement of any such action shall not relieve such indemnifying party of any
liability to the Indemnified Person or Indemnified Party under this Section 6,
except to the extent that the indemnifying party is prejudiced in its ability to
defend such action. The indemnification required by this Section 6 shall be made
by periodic payments of the amount thereof during the course of the
investigation or defense, as such expense, loss, damage or liability is incurred
and is due and payable.

                  7. CONTRIBUTION. To the extent any indemnification by an
indemnifying party is prohibited or limited by law, the indemnifying party
agrees to make the maximum contribution with respect to any amounts for which it
would otherwise be liable under Section 6 to the fullest extent permitted by
law; provided, however, that (a) no contribution shall be made under
circumstances where the maker would not have been liable for indemnification
under the fault standards set forth in Section 6; (b) no seller of Registrable
Securities guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Securities Act) shall be entitled to contribution from any seller
of Registrable Securities who was not guilty of such fraudulent
misrepresentation; and (c) contribution by any seller of Registrable Securities
shall be limited in amount to the net amount of proceeds received by such seller
from the sale of such Registrable Securities.

                  8. REPORTS UNDER EXCHANGE ACT. With a view to making available
to the Investor the benefits of Rule 144 promulgated under the Securities Act or
any other similar rule or regulation of the SEC that may at any time permit the
Investor to sell securities of the Company to the public without registration
("Rule 144"), the Company agrees to:

                  (a) make and keep public information available, as those terms
are understood and defined in Rule 144;


                                      E-56

<PAGE>



                  (b) file with the SEC in a timely manner all reports and other
documents required of the Company under the Securities Act and the Exchange Act;
and

                  (c) furnish to the Investor so long as the Investor owns
Registrable Securities, promptly upon request, (i) a written statement by the
Company that it has complied with the reporting requirements of Rule 144, the
Securities Act and the Exchange Act, (ii) a copy of the most recent annual or
quarterly report of the Company and such other reports and documents so filed by
the Company and (iii) such other information as may be reasonably requested to
permit the Investor to sell such securities pursuant to Rule 144 without
registration.

                  9. ASSIGNMENT OF THE REGISTRATION RIGHTS. The rights to have
the Company register Registrable Securities pursuant to this Agreement shall be
automatically assigned by the Investor to any transferee of the Registrable
Securities (or all or any shares of Preferred Stock of the Company which is
convertible into such securities) only if: (a) the Investor agrees in writing
with the transferee or assignee to assign such rights, and a copy of such
agreement is furnished to the Company within a reasonable time after such
assignment, (b) the Company is, within a reasonable time after such transfer or
assignment, furnished with written notice of (i) the name and address of such
transferee or assignee and (ii) the securities with respect to which such
registration rights are being transferred or assigned, (c) immediately following
such transfer or assignment the further disposition of such securities by the
transferee or assignee is restricted under the Securities Act and applicable
state securities laws, and (d) at or before the time the Company received the
written notice contemplated by clause (b) of this sentence the transferee or
assignee agrees in writing with the Company to be bound by all of the provisions
contained herein. In the event of any delay in filing or effectiveness of the
Registration Statement as a result of such assignment, the Company shall not be
liable for any damages arising from such delay, or the payments set forth in
Section 2(b) hereof.

                  10. AMENDMENT OF REGISTRATION RIGHTS. Any provision of this
Agreement may be amended and the observance thereof may be waived (either
generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and Investor who
hold at least a sixty-six (66%) percent interest of the Registrable Securities.
Any amendment or waiver effected in accordance with this Section 10 shall be
binding upon the Investor and the Company.

                  11. MISCELLANEOUS. (a) A person or entity is deemed to be a
holder of Registrable Securities whenever such person or entity owns of record
such Registrable Securities. If the Company receives conflicting instructions,
notices or elections from two or more persons or entities with respect to the
same Registrable Securities, the Company shall act upon the basis of
instructions, notice or election received from the registered owner of such
Registrable Securities.

                  (b) Notices required or permitted to be given hereunder shall
be in writing and shall be deemed effectively given, (i) on the date delivered,
(a) by personal delivery, or (b) if advance copy is given by fax, (ii) seven
business days after deposit in the United States Postal Service by regular or
certified mail, (iii) three business days mailing by international express
courier, with postage and fees prepaid, addressed to each of the other parties
thereunto entitled at the following addresses, or at such other addresses as a
party may designate by ten days advance written notice to each of the other
parties hereto, (iv) if to the Company, XYBERNAUT CORPORATION, 12701 Fair Lakes
Circle, Suite 550, Fairfax, Virginia 22033, ATTN: Chief Financial Officer, with
a copy to Parker Chapin Flattau & Klimpl, LLP, 1211 Avenue of the Americas, New
York, New York 10036, ATTN: Martin Eric Weisberg, Esq.; (v) if to the Investor,

                                      E-57

<PAGE>



FOREST AVENUE LLC, c/o Citco Trustees (Cayman) Limited Commericial Centre, PO
Box 31106 SMB Grand Cayman, Cayman Islands British West Indies, ATTN: Bas
Horsten, with a copy to Krieger & Prager, Esqs., 319 Fifth Avenue, New York, New
York 10016, ATTN: Samuel M. Krieger, Esq. and (vi) if to any other Investor, at
such address as such Investor shall have provided in writing to the Company, or
at such other address as each such party furnishes by notice given in accordance
with this Section 11(b), and shall be effective, when personally delivered, upon
receipt and, when so sent by certified mail, four (4) calendar days after
deposit with the United States Postal Service.

         (c) Failure of any party to exercise any right or remedy under this
Agreement or otherwise, or delay by a party in exercising such right or remedy,
shall not operate as a waiver thereof.

         (d) This Agreement shall be governed by and interpreted in accordance
with the laws of the State of New York without giving effect to the principles
thereof regarding the conflict of laws. Each of the parties consents to the
exclusive jurisdiction of the federal courts whose districts encompass any part
of the City of New York in connection with any dispute arising under this
Agreement and hereby waives, to the maximum extent permitted by law, any
objection, including any objection based on FORUM NON CONVENIENS, to the
bringing of any such proceeding in such jurisdictions. Each party waives its
right to a trial by jury. Each party to this Agreement irrevocably consents to
the service of process in any such proceeding by the mailing of copies thereof
by registered or certified mail, postage prepaid, to such party at its address
set forth herein. Nothing herein shall affect the right of any party to serve
process in any other manner permitted by law.

         (e) This Agreement and the Securities Purchase Agreement constitute the
entire agreement among the parties hereto with respect to the subject matter
hereof. There are no restrictions, promises, warranties or undertakings, other
than those set forth or referred to herein and therein. This Agreement
supersedes all prior agreements and understandings among the parties hereto with
respect to the subject matter hereof.

         (f) Subject to the requirements of Section 9 hereof, this Agreement
shall inure to the benefit of and be binding upon the successors and assigns of
each of the parties hereto.

         (g) All pronouns and any variations thereof refer to the masculine,
feminine or neuter, singular or plural, as the context may require.

         (h) The headings in this Agreement are for convenience of reference
only and shall not limit or otherwise affect the meaning thereof.

         (i) This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original but all of which shall constitute one and the
same agreement. This Agreement, once executed by a party, may be delivered to
the other party hereto by telephone line facsimile transmission of a copy of
this Agreement bearing the signature of the party so delivering this Agreement.

         (j) If any provision of this Agreement for any reason be held invalid
or unenforceable, such invalidity or unenforceability shall not affect any other
provision hereof and this Agreement shall be construed as if such invalid or
unenforceable provision had never been contained herein.


                                      E-58

<PAGE>



         IN WITNESS WHEREOF, the parties have caused this Registration Rights
Agreement to be duly executed by their respective officers thereunto duly
authorized as of the day and year first above written.


                                            XYBERNAUT CORPORATION


                                            By:  /s/ Steven A. Newman
                                                 -------------------------------
                                                 Name: Steven A. Newman
                                                 Title:    Vice Chairman


                                            FOREST AVENUE LLC


                                            By:
                                                 -------------------------------
                                                 Name:
                                                 Title:



                                      E-59



                                                                    EXHIBIT 10.2
                                                                    ------------
                            FORM OF ESCROW AGREEMENT

         ESCROW AGREEMENT (the "Escrow Agreement") made as of the 11th day of
May, 1999, by and among Xybernaut Corporation, a Delaware corporation with
offices at 12701 Fair Lakes Circle, Suite 550, Fairfax, Virginia 22033 (the
"Company"), Forest Avenue LLC, a Cayman Islands limited liability company with
offices at c/o Citco Trustees (Cayman) Limited Commericial Centre, PO Box 31106
SMB Grand Cayman, Cayman Islands, British West Indies (the "Purchaser") and
Parker Chapin Flattau & Klimpl, LLP, a New York limited liability partnership
with offices at 1211 Avenue of the Americas, New York, New York 10027, as escrow
agent (the "Escrow Agent").

                              W I T N E S S E T H:

         WHEREAS, the Company desires to raise capital for the production and
marketing of the Company's Mobile Assistant(R) IV and related products and for
general working capital purposes and acquisitions;

         WHEREAS, the Company and the Purchaser have agreed that, in order to
raise capital, the Company shall issue and sell to the Purchasers an aggregate
of 2,000 shares of Series E Preferred Stock of the Company (the "Preferred
Stock"), each share convertible into shares of the Company's common stock, $0.01
par value per share (the "Common Stock"), and warrants to purchase an aggregate
of 50,000 shares of Common Stock (the "Warrants"), for an aggregate purchase
price of $2,000,000.00 (the "Sale");

         WHEREAS, pursuant to the Sale, the Company will enter into a Securities
Purchase Agreement dated as of May 11, 1999 (the "Purchase Agreement") with the
Purchaser, in the form attached as Exhibit A hereto; and

         WHEREAS, the Purchase Agreement contemplates that all funds shall be
paid into escrow and the original certificates representing the Preferred Stock
(the "Certificates") and original Warrants shall be held in escrow prior to the
Closing Date (as defined in the Purchase Agreement) and the Escrow Agent has
agreed to receive, hold and pay such funds and to receive such Certificates and
Warrants, upon the terms and subject to the conditions hereinafter set forth.

         NOW, THEREFORE, in consideration of the mutual covenants herein
contained, and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties to this Escrow
Agreement hereby agree as follows:

         1. Defined Terms. Capitalized terms used and not otherwise defined
herein shall have the meanings respectively assigned to them in the Purchase
Agreement.

         2. Escrow of Funds. At or prior to the Closing Date, the following
shall occur: (a) the Purchaser shall remit by wire transfer the Purchase Price
to the Escrow Agent pursuant to this Escrow Agreement as payment in full for the
Preferred Stock and the Warrants (the "Escrow Amount"); (b) the Company shall
deliver or cause to be delivered to Escrow Agent the Certificates and the
Warrants registered in the name of the Purchaser (or any nominee designated by
the Purchaser at least three days before the Closing Date), free and clear of
all liens, claims, charges and encumbrances. The Escrow Agent shall hold the
Escrow Amount and the Certificates and the Warrants and shall deliver them or
redeliver

                                      E-60

<PAGE>



them to the Company or to the Purchaser, as applicable, only in accordance with
the terms and conditions of this Escrow Agreement.

         3. Investment of Funds. The Escrow Agent shall invest the monies in the
Escrow Amount in an interest bearing bank account with, or certificates of
deposit or time deposits with maturities of no more than thirty (30) days issued
by, a domestic commercial bank or such other bank or other financial institution
as it normally holds such funds.

         4. Release of Funds. (a) The Escrow Agent shall release the Escrow
Amount and the Certificates and the Warrants upon receipt, at any time, of
instructions from the Company and the Purchaser directing the manner in which
the return or other distribution of the funds in the Escrow Amount and the
Certificates and the Warrants are to be made.

                  (b) Immediately following notification to the Escrow Agent by
the Company and the Purchaser that each of the conditions precedent to a Closing
has been satisfied or waived, the Company shall be paid the Escrow Amount and
the Purchaser shall receive the Certificates and the Warrants.

                  (c) If no closing occurs and the Escrow Agent does not receive
joint instructions of the Company and the Purchaser regarding an extension of
the Closing Date, the Escrow Agent shall promptly thereafter return the Escrow
Amount to the Purchaser and the Certificates and the Warrants to the Company.

                  (d) Any interest earned on the Escrow Amount shall be paid to
the party receiving the Escrow Amount.

         5. Further Assurances. The Company and the Purchaser agree to do such
further acts and to execute and deliver such statements, assignments,
agreements, instruments and other documents as the Escrow Agent from time to
time reasonably may request in connection with the administration, maintenance,
enforcement or adjudication of this Escrow Agreement in order (a) to give the
Escrow Agent confirmation and assurance of the Escrow Agent's rights, powers,
privileges, remedies and interests under this Escrow Agreement and applicable
law, (b) to better enable the Escrow Agent to exercise any such right, power,
privilege, remedy or interest, or (c) to otherwise effectuate the purpose and
the terms and provisions of this Escrow Agreement, each in such form and
substance as may be reasonably acceptable to the Escrow Agent.

         6. Conflicting Demands. If conflicting or adverse claims or demands are
made or notices served upon the Escrow Agent with respect to the escrow provided
for herein, the Company and the Purchaser agree that the Escrow Agent shall
refuse to comply with any such claim or demand and withhold and stop all further
performance of this escrow so long as such disagreement shall continue. In so
doing, the Escrow Agent shall not be or become liable for damages, losses,
costs, expenses or interest to any or any other person for its failure to comply
with such conflicting or adverse demands. The Escrow Agent shall be entitled to
continue to so refrain and refuse to so act until such conflicting claims or
demands shall have been finally determined by a court or arbitrator of competent
jurisdiction or shall have been settled by agreement of the parties to such
controversy, in which case the Escrow Agent shall be notified thereof in a
notice signed by such parties. The Escrow Agent may also elect to commence an
interpleader or other action for declaratory judgment for the purpose of having
the respective rights of the claimants adjudicated, and may deposit with the
court all funds held hereunder pursuant to this Escrow Agreement; and if it so

                                      E-61

<PAGE>



commences and deposits, the Escrow Agent shall be relieved and discharged from
any further duties and obligations under this Escrow Agreement.

         7. Disputes. Each of the parties hereto hereby covenants and agrees
that the Federal or state courts located in the Borough of Manhattan, State of
New York shall have jurisdiction over any dispute with the Escrow Agent or
relating to this Escrow Agreement.

         8. Expenses of the Escrow Agent. The Company agrees to pay any and all
out-of-pocket costs and expenses incurred by the Escrow Agent in connection with
all waivers, releases, discharges, satisfactions, modifications and amendments
of this Escrow Agreement, the administration and holding of the Escrow Amount
and the investment of such funds, and the enforcement, protection and
adjudication of the parties' rights hereunder by the Escrow Agent, including,
without limitation, the out-of-pocket disbursements and expenses of the Escrow
Agent itself and those of other attorneys it may retain, if any. The Company
shall be liable to the Escrow Agent for any expenses payable by the Escrow
Agent.

         9. Reliance on Documents and Experts. The Escrow Agent shall be
entitled to rely upon any notice, consent, certificate, affidavit, statement,
paper, document, writing or communication (which to the extent permitted
hereunder may be by telegram, cable, telex, telecopier, or telephone) reasonably
believed by it to be genuine and to have been signed, sent or made by the proper
person or persons, and upon opinions and advice of legal counsel (including
itself or counsel for any party hereto), independent public accountants and
other experts selected by the Escrow Agent and mutually acceptable to each of
the Company and the Purchaser. The Escrow Agent shall not be responsible to
review the Certificates other than to confirm that it has been signed or to
determine the clearance of checks received for the Escrow Amount.

         10. Status of the Escrow Agent, Etc. The Escrow Agent is acting under
this Escrow Agreement as a stakeholder only. No term or provision of this Escrow
Agreement is intended to create, nor shall any such term or provision be deemed
to have created, any joint venture, partnership or attorney-client relationship
between or among the Escrow Agent and the Company or the Purchaser. This Escrow
Agreement shall not be deemed to prohibit or in any way restrict the Escrow
Agent's representation of the Company, who may be advised by the Escrow Agent on
any and all matters pertaining to this Escrow Agreement. To the extent the
Company has been represented by the Escrow Agent, the Company hereby waives any
conflict of interest and irrevocably authorizes and directs the Escrow Agent to
carry out the terms and provisions of this Escrow Agreement fairly as to all
parties, without regard to any such representation and irrespective of the
impact upon the Company. The Escrow Agent's only duties are those expressly set
forth in this Escrow Agreement, and each of the Company and the Purchaser
authorize the Escrow Agent to perform those duties in accordance with its usual
practices in holding funds of its own or those of other escrows. The Escrow
Agent may exercise or otherwise enforce any of its rights, powers, privileges,
remedies and interests under this Escrow Agreement and applicable law or perform
any of its duties under this Escrow Agreement by or through its partners,
employees, attorneys, agents or designees.

         11. Exculpation. The Escrow Agent and its designees, and their
respective partners, employees, attorneys and agents, shall not incur any
liability whatsoever for the investment or disposition of funds or the taking of
any other action in accordance with the terms and provisions of this Escrow
Agreement, for any mistake or error in judgment, for compliance with any
applicable law or any attachment, order or other directive of any court or other
authority (irrespective of any conflicting term or provision of this Escrow
Agreement), or for any act or omission of any other person selected with

                                      E-62

<PAGE>



reasonable care and engaged by the Escrow Agent in connection with this Escrow
Agreement (other than for such Escrow Agent's or such person's own acts or
omissions breaching a duty owed to the claimant under this Escrow Agreement and
amounting to gross negligence or willful misconduct as finally determined
pursuant to applicable law by a governmental authority having jurisdiction); and
each of the Company and the Purchaser hereby waive any and all claims and
actions whatsoever against the Escrow Agent and its designees, and their
respective partners, employees, attorneys and agents, arising out of or related
directly or indirectly to any and all of the foregoing acts, omissions and
circumstances. Furthermore, the Escrow Agent and its designees, and their
respective partners, employees, attorneys and agents, shall not incur any
liability (other than for a person's own acts or omissions breaching a duty owed
to the claimant under this Escrow Agreement and amounting to willful misconduct
as finally determined pursuant to applicable law by a governmental authority
having jurisdiction) for other acts and omissions arising out of or related
directly or indirectly to this Escrow Agreement or the Escrow Amount; and each
of the Company and the Purchaser hereby expressly waives any and all claims and
actions (other than those attributable to a person's own acts or omissions
breaching a duty owed to the claimant and amounting to gross negligence or
willful misconduct as finally determined pursuant to applicable law by a
governmental authority having jurisdiction) against the Escrow Agent and its
designees, and their respective partners, employees, attorneys and agents,
arising out of or related directly or indirectly to any and all of the foregoing
acts, omissions and circumstances.

         12. Indemnification. The Escrow Agent and its designees, and their
respective partners, employees, attorneys and agents, shall be indemnified,
reimbursed, held harmless and, at the request of the Escrow Agent, defended, by
the Company from and against any and all claims, liabilities, losses and
expenses (including, without limitation, the reasonable disbursements, expenses
and fees of their respective attorneys) that may be imposed upon, incurred by,
or asserted against any of them, arising out of or related directly or
indirectly to this Escrow Agreement or the Escrow Amount, except such as are
occasioned by the indemnified person's own acts and omissions breaching a duty
owed to the claimant under this Escrow Agreement and amounting to willful
misconduct as finally determined pursuant to applicable law by a governmental
authority having jurisdiction.

         13. Notices. Any notice required or permitted hereunder shall be given
in writing (unless otherwise specified herein) and shall be deemed effectively
given, (i) on the date delivered, (a) by personal delivery, or (b) if advance
copy is given by fax, (ii) seven business days after deposit in the United
States Postal Service by regular or certified mail, or (iii) three business days
mailing by international express courier, with postage and fees prepaid,
addressed to each of the other parties thereunto entitled at the following
addresses, or at such other addresses as a party may designate by ten days
advance written notice to each of the other parties hereto, (iv) if to the
Company, XYBERNAUT CORPORATION, 12701 Fair Lakes Circle, Suite 550, Fairfax,
Virginia 22033, ATTN: Chief Financial Officer, with a copy to Parker Chapin
Flattau & Klimpl, LLP, 1211 Avenue of the Americas, New York, New York 10036,
ATTN: Martin Eric Weisberg, Esq.; (v) if to the Investor, FOREST AVENUE LLC, c/o
Citco Trustees (Cayman) Limited Commericial Centre, PO Box 31106 SMB Grand
Cayman, Cayman Islands British West Indies, ATTN: Bas Horsten, with a copy to
Krieger & Prager, Esqs., 319 Fifth Avenue, New York, New York 10016, ATTN:
Samuel M. Krieger, Esq.

         14. Section and Other Headings. The section and other headings
contained in this Escrow Agreement are for convenience only, shall not be deemed
a part of this Escrow Agreement and shall not affect the meaning or
interpretation of this Escrow Agreement.

                                      E-63

<PAGE>



         15. Governing Law. This Escrow Agreement shall be governed by and
interpreted in accordance with the laws of the State of New York without giving
effect to the principles thereof regarding the conflict of laws. Each of the
parties consents to the exclusive jurisdiction of the federal courts whose
districts encompass any part of the City of New York in connection with any
dispute arising under this Agreement and hereby waives, to the maximum extent
permitted by law, any objection, including any objection based on FORUM NON
CONVENIENS, to the bringing of any such proceeding in such jurisdictions. Each
party waives its right to a trial by jury. Each party to this Escrow Agreement
irrevocable consents to the service of process in any such proceeding by the
mailing of copies thereof by registered or certified mail, postage prepaid, to
such party to serve process in any other manner permitted by law.

         16. Counterparts. This Escrow Agreement may be executed by the parties
hereto in separate counterparts, each of which when so executed and delivered
shall be an original but all such counterparts shall together constitute one and
the same agreement.

         17. Resignation of Escrow Agent. The Escrow Agent may, at any time, at
its option, elect to resign its duties as Escrow Agent under this Escrow
Agreement by providing notice thereof to each of the Company and the Purchaser.
In such event, the Escrow Agent shall deposit the Escrow Amount with a successor
escrow agent to be appointed by (a) the Company and the Purchaser within 30 days
following the receipt by the parties of such notice of resignation from the
Escrow Agent, or (b) the Escrow Agent if the Company and the Purchaser shall
have not agreed on a successor escrow agent within the aforesaid 30 day period,
upon which appointment and delivery of the Escrow Amount the Escrow Agent shall
be released of and from all liability under this Escrow Agreement.

         18. Successors and Assigns; Assignment. Whenever in this Escrow
Agreement reference is made to any party, such reference shall be deemed to
include the successors, assigns and legal representatives of such party, and,
without limiting the generality of the foregoing, all representations,
warranties, covenants and other agreements made by or on behalf of each of the
Company and the Purchaser in this Escrow Agreement shall inure to the benefit of
any successor escrow agent hereunder; provided, however, that nothing herein
shall be deemed to authorize or permit the Company or the Purchaser to assign
any of its rights or obligations hereunder to any other person (whether or not
an affiliate of the Company or the Purchaser) without the written consent of
each of the other parties nor to authorize or permit the Escrow Agent to assign
any of its duties or obligations hereunder except as provided in Section 17
hereof.

         19. No Third Party Rights. The representations, warranties and other
terms and provisions of this Escrow Agreement are for the exclusive benefit of
the parties hereto, and no other person, including the creditors of the Company
or the Purchaser, shall have any right or claim against any party by reason of
any of those terms and provisions or be entitled to enforce any of those terms
and provisions against any party.

         20. No Waiver by Action, Etc. Any waiver or consent respecting any
representation, warranty, covenant or other term or provision of this Escrow
Agreement shall be effective only in the specific instance and for the specific
purpose for which given and shall not be deemed, regardless of frequency given,
to be a further or continuing waiver or consent. The failure or delay of a party
at any time or times to require performance of, or to exercise its rights with
respect to, any representation, warranty, covenant or other term or provision of
this Escrow Agreement in no manner (except as otherwise expressly provided
herein) shall affect its right at a later time to enforce any such term or
provision. No notice to or demand

                                      E-64

<PAGE>



on either the Company or the Purchaser in any case shall entitle such party to
any other or further notice or demand in the same, similar or other
circumstances. All rights, powers, privileges, remedies and interests of the
parties under this Escrow Agreement are cumulative and not alternatives, and
they are in addition to and shall not limit (except as otherwise expressly
provided herein) any other right, power, privilege, remedy or interest of the
parties under this Escrow Agreement or applicable law.

         21. Modification, Amendment, Etc. Each and every modification and
amendment of this Escrow Agreement shall be in writing and signed by all of the
parties hereto, and each and every waiver of, or consent to any departure from,
any covenant, representation, warranty or other provision of this Escrow
Agreement shall be in writing and signed by the party granting such waiver or
consent.

         22. Entire Agreement. This Escrow Agreement and the Purchase Agreement
contain the entire agreement of the parties with respect to the matters
contained herein and therein and supersedes all prior representations,
agreements and understandings, oral or otherwise, among the parties with respect
to the matters contained herein.

         IN WITNESS WHEREOF, the parties hereto have executed this Escrow
Agreement on the date first written above.

                              XYBERNAUT CORPORATION



                               By: /s/ Steven A. Newman
                                   -----------------------------------
                                    Name:  Steven A. Newman
                                    Title:   Vice Chairman


                               FOREST AVENUE LLC



                               By:_____________________________________
                                      Name:
                                     Title:



                               PARKER CHAPIN FLATTAU & KLIMPL, LLP,
                                    as escrow agent

                               /s/ Martin E. Weisberg
                               ----------------------------------------
                               Name: Martin E. Weisberg
                               Title: Partner


                                      E-65



                                                                    EXHIBIT 23.1
                                           CONSENT OF PRICEWATERHOUSECOOPERS LLP



                       CONSENT OF INDEPENDENT ACCOUNTANTS


         We hereby consent to the incorporation by reference in this
Registration Statement on Form S-3 of our report dated April 14, 1999 relating
to the consolidated financial statements, which appears in Xybernaut
Corporation's Annual Report on Form 10-KSB for the year ended December 31, 1998.
We also consent to the reference to us under the heading "Experts" in such
Registration Statement.

 /s/ PricewaterhouseCoopers LLP
- -------------------------------------
PricewaterhouseCoopers LLP


McLean, VA
June 16, 1999

                                      E-66



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