<PAGE>

                                                                    EXHIBIT 4.06

               THE CENTER FOR ADAPTIVE SYSTEMS APPLICATIONS, INC.

                                 1995 STOCK PLAN

                             STOCK OPTION AGREEMENT

         Unless otherwise defined herein, the terms defined in the Plan shall
have the same defined meanings in this Option Agreement.

I. NOTICE OF STOCK OPTION GRANT

[OPTIONEE'S NAME AND ADDRESS]

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

         You have been granted an option to purchase Common Stock of the
Company, subject to the terms and conditions of the Plan and this Option
Agreement, as follows:

         Grant Number                 _________________________

         Date of Grant                       _________________________

         Vesting Commencement Date           _________________________

         Exercise Price per Share            $________________________

         Total Number of Shares Granted      _________________________

         Total Exercise Price                $_________________________

         Type of Option:                     ___      Incentive Stock Option

                                             ___      Nonstatutory Stock Option

         Term/Expiration Date:               _________________________

     VESTING SCHEDULE:

         This Option may be exercised, in whole or in part, in accordance with
the following schedule:

<PAGE>


         25% of the Shares subject to the Option shall vest twelve months after
the Vesting Commencement Date and 1/48 of the Shares subject to the Option shall
vest each month thereafter.

         TERMINATION PERIOD:

         This Option may be exercised for sixty (60) days after termination of
employment or consulting relationship, or such longer period as may be
applicable upon death or disability of Optionee as provided in the Plan, but in
no event later than the Term/Expiration Date as provided above.

II.  AGREEMENT

         1. GRANT OF OPTION. The Center for Adaptive Systems Applications, Inc.,
a Delaware corporation (the "Company"), hereby grants to the Optionee named in
the Notice of Grant (the "Optionee"), an option (the "Option") to purchase the
total number of shares of Common Stock (the "Shares") set forth in the Notice of
Grant, at the exercise price per share set forth in the Notice of Grant (the
"Exercise Price") subject to the terms, definitions and provisions of the 1995
Stock Plan (the "Plan") adopted by the Company, which is incorporated herein by
reference. Unless otherwise defined herein, the terms defined in the Plan shall
have the same defined meanings in this Option.

                 If designated in the Notice of Grant as an Incentive Stock
Option ("ISO"), this Option is intended to qualify as an Incentive Stock Option
as defined in Section 422 of the Code. However, if this Option is intended to be
an Incentive Stock Option, to the extent that it exceeds the $100,000 rule of
Code Section 422(d), it shall be treated as a Nonstatutory Stock Option ("NSO").

         2. EXERCISE OF OPTION. This Option shall be exercisable during its term
in accordance with the Vesting Schedule set out in the Notice of Grant and with
the provisions of Section 9 of the Plan as follows:

                  (i) RIGHT TO EXERCISE.

                           (a) This Option may not be exercised for a fraction
of a Share.

                           (b) In the event of Optionee's death, disability or
other termination of the employment or consulting relationship, the
exercisability of the Option is governed by Sections 6, 7 and 8 below, subject
to the limitation contained in subsection 2(i)(c).

                           (c) In no event may this Option be exercised after
the date of expiration of the term of this Option as set forth in the Notice of
Grant.


<PAGE>


                 (ii) METHOD OF EXERCISE. This Option shall be exercisable by
written notice (in the form attached as Exhibit A) which shall state the
election to exercise the Option, the number of Shares in respect of which the
Option is being exercised, and such other representations and agreements as to
the holder's investment intent with respect to such shares of Common Stock as
may be required by the Company pursuant to the provisions of the Plan, including
a required market stand-off period following the Company's initial public
offering. Such written notice shall be signed by the Optionee and shall be
delivered in person or by certified mail to the Secretary of the Company. The
written notice shall be accompanied by payment of the Exercise Price. This
Option shall be deemed to be exercised upon receipt by the Company of such
written notice accompanied by the Exercise Price.

                 No Shares will be issued pursuant to the exercise of an Option
unless such issuance and such exercise shall comply with all relevant provisions
of law and the requirements of any stock exchange upon which the Shares may then
be listed. Assuming such compliance, for income tax purposes the Shares shall be
considered transferred to the Optionee on the date on which the Option is
exercised with respect to such Shares.

         3. OPTIONEE'S REPRESENTATIONS. In the event the Shares purchasable
pursuant to the exercise of this Option have not been registered under the
Securities Act of 1933, as amended, at the time this Option is exercised,
Optionee shall, if required by the Company, concurrently with the exercise of
all or any portion of this Option, deliver to the Company his or her Investment
Representation Statement in the form attached hereto as Exhibit B.

         4. METHOD OF PAYMENT. Payment of the Exercise Price shall be by any of
the following, or a combination thereof, at the election of the Optionee:

                 (i)   cash; or

                 (ii)  check;

                 (iii) full recourse promissory note secured by assets other
than the purchased Shares;

                 (iv)  surrender of other shares of Common Stock of the Company
which in the case of Shares acquired pursuant to the exercise of a Company
option, (A) have been owned by the Optionee for more than six (6) months on the
date of surrender and (B) have a Fair Market Value on the date of surrender
equal to the Exercise Price of the Shares as to which the Option is being
exercised; or


                                  -3-
<PAGE>


                 (v) delivery of a properly executed exercise notice together
with such other documentation as the Administrator and the broker, if
applicable, shall require to effect an exercise of the Option and delivery to
the Company of the sale or loan proceeds required to pay the Exercise Price.

         5. RESTRICTIONS ON EXERCISE. This Option may not be exercised until
such time as the Plan has been approved by the stockholders of the Company, or
if the issuance of such Shares upon such exercise or the method of payment of
consideration for such shares would constitute a violation of any applicable
federal or state securities or other law or regulation, including any rule under
Part 207 of Title 12 of the Code of Federal Regulations ("Regulation G") as
promulgated by the Federal Reserve Board. As a condition to the exercise of this
Option, the Company may require Optionee to make any representation and warranty
to the Company as may be required by any applicable law or regulation.

         6. TERMINATION OF RELATIONSHIP. In the event an Optionee's Continuous
Status as an Employee or Consultant terminates, Optionee may, to the extent
otherwise so entitled at the date of such termination (the "Termination Date"),
exercise this Option during the Termination Period set out in the Notice of
Grant. To the extent that Optionee was not entitled to exercise this Option at
the date of such termination, or if Optionee does not exercise this Option
within the time specified herein, the Option shall terminate.

         7. DISABILITY OF OPTIONEE. Notwithstanding the provisions of Section 6
above, in the event of termination of an Optionee's consulting relationship or
Continuous Status as an Employee as a result of his or her disability, Optionee
may, but only within twelve (12) months from the date of such termination (and
in no event later than the expiration date of the term of such Option as set
forth in the Option Agreement), exercise the Option to the extent otherwise
entitled to exercise it at the date of such termination; provided, however, that
if such disability is not a "disability" as such term is defined in Section
22(e)(3) of the Code, in the case of an Incentive Stock Option such Incentive
Stock Option shall automatically convert to a Nonstatutory Stock Option on the
day three months and one day following such termination. To the extent that
Optionee was not entitled to exercise the Option at the date of termination, or
if Optionee does not exercise such Option to the extent so entitled within the
time specified herein, the Option shall terminate, and the Shares covered by
such Option shall revert to the Plan.

         8. DEATH OF OPTIONEE. In the event of termination of Optionee's
Continuous Status as an Employee or Consultant as a result of the death of
Optionee, the Option may be exercised at any time within twelve (12) months
following the date of death (but in no event later than the date of expiration
of the term of this Option as set forth in Section 10 below), by Optionee's
estate or by a person who acquired the right to exercise the Option by bequest
or inheritance, but only to the extent the Optionee could exercise the Option at
the date of death.


                               -4-
<PAGE>


         9. NON-TRANSFERABILITY OF OPTION. This Option may not be transferred in
any manner otherwise than by will or by the laws of descent or distribution and
may be exercised during the lifetime of Optionee only by Optionee. The terms of
this Option shall be binding upon the executors, administrators, heirs,
successors and assigns of the Optionee.

         10. TERM OF OPTION. This Option may be exercised only within the term
set out in the Notice of Grant, and may be exercised during such term only in
accordance with the Plan and the terms of this Option. The limitations set out
in Section 7 of the Plan regarding Options designated as Incentive Stock Options
and Options granted to more than ten percent (10%) stockholders shall apply to
this Option.

         11. TAXATION UPON EXERCISE OF OPTION. Optionee understands that, upon
exercising a Nonstatutory Option, he or she will recognize income for tax
purposes in an amount equal to the excess of the then Fair Market Value of the
Shares over the exercise price. However, the timing of this income recognition
may be deferred for up to six months if Optionee is subject to Section 16 of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"). If the
Optionee is an Employee, the Company will be required to withhold from
Optionee's compensation, or collect from Optionee and pay to the applicable
taxing authorities an amount equal to a percentage of this compensation income.
Additionally, the Optionee may at some point be required to satisfy tax
withholding obligations with respect to the disqualifying disposition of an
Incentive Stock Option. The Optionee shall satisfy his or her tax withholding
obligation arising upon the exercise of this Option out of Optionee's
compensation or by payment to the Company.

         12. TAX CONSEQUENCES. Set forth below is a brief summary as of the date
of this Option of some of the federal tax consequences of exercise of this
Option and disposition of the Shares. THIS SUMMARY IS NECESSARILY INCOMPLETE,
AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. OPTIONEE SHOULD CONSULT
A TAX ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING OF THE SHARES.

                 (i)   EXERCISE OF ISO. If this Option qualifies as an ISO,
there will be no regular federal income tax liability upon the exercise of
the Option, although the excess, if any, of the Fair Market Value of the
Shares on the date of exercise over the Exercise Price will be treated as an
adjustment to the alternative minimum tax for federal tax purposes and may
subject the Optionee to the alternative minimum tax in the year of exercise.

                 (ii)  EXERCISE OF ISO FOLLOWING DISABILITY. If the Optionee's
Continuous Status as an Employee or Consultant terminates as a result of
disability that is not total and permanent disability as defined in Section
22(e)(3) of the Code, to the extent permitted on the date of


                                     -5-
<PAGE>

termination, the Optionee must exercise an ISO within 90 days of such
termination for the ISO to be qualified as an ISO.

                 (iii) EXERCISE OF NONSTATUTORY STOCK OPTION. There may be a
regular federal income tax liability upon the exercise of a Nonstatutory Stock
Option. The Optionee will be treated as having received compensation income
(taxable at ordinary income tax rates) equal to the excess, if any, of the Fair
Market Value of the Shares on the date of exercise over the Exercise Price. If
Optionee is an Employee or a former Employee, the Company will be required to
withhold from Optionee's compensation or collect from Optionee and pay to the
applicable taxing authorities an amount in cash equal to a percentage of this
compensation income at the time of exercise, and may refuse to honor the
exercise and refuse to deliver Shares if such withholding amounts are not
delivered at the time of exercise.

                 (iv)  DISPOSITION OF SHARES. In the case of an NSO, if Shares
are held for at least one year, any gain realized on disposition of the Shares
will be treated as long-term capital gain for federal income tax purposes. In
the case of an ISO, if Shares transferred pursuant to the Option are held for at
least one year after exercise and are disposed of at least two years after the
Date of Grant, any gain realized on disposition of the Shares will also be
treated as long-term capital gain for federal income tax purposes. If Shares
purchased under an ISO are disposed of within such one-year period or within two
years after the Date of Grant, any gain realized on such disposition will be
treated as compensation income (taxable at ordinary income rates) to the extent
of the difference between the Exercise Price and the lesser of (1) the Fair
Market Value of the Shares on the date of exercise, or (2) the sale price of the
Shares.

                 (v)   NOTICE OF DISQUALIFYING DISPOSITION OF ISO SHARES. If the
Option granted to Optionee herein is an ISO, and if Optionee sells or otherwise
disposes of any of the Shares acquired pursuant to the ISO on or before the
later of (1) the date two years after the Date of Grant, or (2) the date one
year after the date of exercise, the Optionee shall immediately notify the
Company in writing of such disposition. Optionee agrees that Optionee may be
subject to income tax withholding by the Company on the compensation income
recognized by the Optionee.

         13. ENTIRE AGREEMENT; GOVERNING LAW. The Plan is incorporated herein by
reference. The Plan, this Option Agreement and the Exhibits hereto constitute
the entire agreement of the parties with respect to the subject matter hereof
and supersede in their entirety all prior undertakings and agreements of the
Company and Optionee with respect to the subject matter hereof, and may not be
modified adversely to the Optionee's interest except by means of a writing
signed by the Company and Optionee. This agreement is governed by Delaware law
except for that body of law pertaining to conflict of laws.


                                  -6-
<PAGE>


                                            THE CENTER FOR ADAPTIVE SYSTEMS
                                            APPLICATIONS, INC.,
                                            a Delaware corporation

                                            By:
                                                  -----------------------------

                                            Title:
                                                  -----------------------------

         OPTIONEE ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO
THE OPTION GRANTED HEREBY IS EARNED ONLY BY CONTINUING CONSULTANCY OR EMPLOYMENT
AT THE WILL OF THE COMPANY (NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED
THIS OPTION OR ACQUIRING SHARES HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND
AGREES THAT NOTHING IN THIS AGREEMENT, NOR IN THE COMPANY'S STOCK OPTION PLAN
WHICH IS INCORPORATED HEREIN BY REFERENCE, SHALL CONFER UPON OPTIONEE ANY RIGHT
WITH RESPECT TO CONTINUATION OF EMPLOYMENT OR CONSULTANCY BY THE COMPANY, NOR
SHALL IT INTERFERE IN ANY WAY WITH OPTIONEE'S RIGHT OR THE COMPANY'S RIGHT TO
TERMINATE OPTIONEE'S EMPLOYMENT OR CONSULTANCY AT ANY TIME, WITH OR WITHOUT
CAUSE.

         Optionee acknowledges receipt of a copy of the Plan and represents that
he is familiar with the terms and provisions thereof, and hereby accepts this
Option subject to all of the terms and provisions hereof and thereof. Optionee
has reviewed the Plan and this Option in their entirety, has had an opportunity
to obtain the advice of counsel prior to executing this Option and fully
understands all provisions of the Option. Optionee hereby agrees to accept as
binding, conclusive and final all decisions or interpretations of the
Administrator upon any questions arising under the Plan or this Option. Optionee
further agrees to notify the Company upon any change in the residence address
indicated below.

Dated:
      ----------------------
                                                --------------------------------
                                                Optionee

                                                --------------------------------
                                                Print Name

                                                Residence Address:

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

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

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


                                   -7-
<PAGE>

                                    EXHIBIT A

                                 1995 STOCK PLAN

                                 EXERCISE NOTICE

The Center for Adaptive Systems Applications, Inc.

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

--------------------------------
Attention:  Secretary

         1. EXERCISE OF OPTION. Effective as of today, ___________, 19__, the
undersigned ("Optionee") hereby elects to exercise Optionee's option to purchase
_________ shares of the Common Stock (the "Shares") of The Center for Adaptive
Systems Applications, Inc. (the "Company") under and pursuant to the 1995 Stock
Plan, as amended (the "Plan") and the [ ] Incentive [ ] Nonstatutory Stock
Option Agreement dated ________, 19__ (the "Option Agreement").

         2. REPRESENTATIONS OF OPTIONEE. Optionee acknowledges that Optionee has
received, read and understood the Plan and the Option Agreement and agrees to
abide by and be bound by their terms and conditions.

         3. RIGHTS AS STOCKHOLDER. Until the stock certificate evidencing such
Shares is issued (as evidenced by the appropriate entry on the books of the
Company or of a duly authorized transfer agent of the Company), no right to vote
or receive dividends or any other rights as a stockholder shall exist with
respect to the Optioned Stock, notwithstanding the exercise of the Option. The
Company shall issue (or cause to be issued) such stock certificate promptly
after the Option is exercised. No adjustment will be made for a dividend or
other right for which the record date is prior to the date the stock certificate
is issued, except as provided in Section 12 of the Plan.

                 Optionee shall enjoy rights as a stockholder until such time as
Optionee disposes of the Shares or the Company or its assignee(s) exercises the
Right of First Refusal hereunder. Upon such exercise, Optionee shall have no
further rights as a holder of the Shares so purchased except the right to
receive payment for the Shares so purchased in accordance with the provisions of
this Agreement, and Optionee shall forthwith cause the certificate(s) evidencing
the Shares so purchased to be surrendered to the Company for transfer or
cancellation.

         4. COMPANY'S RIGHT OF FIRST REFUSAL. Before any Shares held by Optionee
or any transferee (either being sometimes referred to herein as the "Holder")
may be sold or otherwise transferred (including transfer by gift or operation of
law), the Company or its assignee(s) shall


<PAGE>


have a right of first refusal to purchase the Shares on the terms and
conditions set forth in this Section (the "Right of First Refusal").

                 (a) NOTICE OF PROPOSED TRANSFER. The Holder of the Shares shall
deliver to the Company a written notice (the "Notice") stating: (i) the Holder's
bona fide intention to sell or otherwise transfer such Shares; (ii) the name of
each proposed purchaser or other transferee ("Proposed Transferee"); (iii) the
number of Shares to be transferred to each Proposed Transferee; and (iv) the
bona fide cash price or other consideration for which the Holder proposes to
transfer the Shares (the "Offered Price"), and the Holder shall offer the Shares
at the Offered Price to the Company or its assignee(s).

                 (b) EXERCISE OF RIGHT OF FIRST REFUSAL. At any time within
thirty (30) days after receipt of the Notice, the Company or its assignee(s)
may, by giving written notice to the Holder, elect to purchase all, but not less
than all, of the Shares proposed to be transferred to any one or more of the
Proposed Transferees, at the purchase price determined in accordance with
subsection (c) below.

                 (c) PURCHASE PRICE. The purchase price ("Purchase Price") for
the Shares purchased by the Company or its assignee(s) under this Section shall
be the Offered Price. If the Offered Price includes consideration other than
cash, the cash equivalent value of the non-cash consideration shall be
determined by the Board of Directors of the Company in good faith.

                 (d) PAYMENT. Payment of the Purchase Price shall be made, at
the option of the Company or its assignee(s), in cash (by check), by
cancellation of all or a portion of any outstanding indebtedness of the Holder
to the Company (or, in the case of repurchase by an assignee, to the assignee),
or by any combination thereof within 30 days after receipt of the Notice or in
the manner and at the times set forth in the Notice.

                 (e) HOLDER'S RIGHT TO TRANSFER. If all of the Shares proposed
in the Notice to be transferred to a given Proposed Transferee are not purchased
by the Company or its assignee(s) as provided in this Section, then the Holder
may sell or otherwise transfer such Shares to that Proposed Transferee at the
Offered Price or at a higher price, provided that such sale or other transfer is
consummated within 120 days after the date of the Notice and provided further
that any such sale or other transfer is effected in accordance with any
applicable securities laws and the Proposed Transferee agrees in writing that
the provisions of this Section shall continue to apply to the Shares in the
hands of such Proposed Transferee. If the Shares described in the Notice are not
transferred to the Proposed Transferee within such period, a new Notice shall be
given to the Company, and the Company or its assignees shall again be offered
the Right of First Refusal before any Shares held by the Holder may be sold or
otherwise transferred.

                 (f) EXCEPTION FOR CERTAIN FAMILY TRANSFERS. Anything to the
contrary contained in this Section notwithstanding, the transfer of any or all
of the Shares during the Optionee's lifetime or on the Optionee's death by will
or intestacy to the Optionee's immediate family or a


<PAGE>

trust for the benefit of the Optionee's immediate family shall be exempt
from the provisions of this Section. "Immediate Family" as used herein shall
mean spouse, lineal descendant or antecedent, father, mother, brother or
sister. In such case, the transferee or other recipient shall receive and
hold the Shares so transferred subject to the provisions of this Section, and
there shall be no further transfer of such Shares except in accordance with
the terms of this Section.

                 (g) TERMINATION OF RIGHT OF FIRST REFUSAL. The Right of First
Refusal shall terminate as to any Shares 90 days after the first sale of Common
Stock of the Company to the general public pursuant to a registration statement
on Form S-1, SB-1 or SB-2 (or successor forms) filed with and declared effective
by the Securities and Exchange Commission under the Securities Act of 1933, as
amended.

         5. TAX CONSULTATION. Optionee understands that Optionee may suffer
adverse tax consequences as a result of Optionee's purchase or disposition of
the Shares. Optionee represents that Optionee has consulted with any tax
consultants Optionee deems advisable in connection with the purchase or
disposition of the Shares and that Optionee is not relying on the Company for
any tax advice.

         6. RESTRICTIVE LEGENDS AND STOP-TRANSFER ORDERS.

                 (a) LEGENDS. Optionee understands and agrees that the Company
shall cause the legends set forth below or legends substantially equivalent
thereto, to be placed upon any certificate(s) evidencing ownership of the Shares
together with any other legends that may be required by the Company or by state
or federal securities laws:

                 THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED
                 UNDER THE SECURITIES ACT OF 1933 (THE "ACT") AND MAY NOT BE
                 OFFERED, SOLD OR OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED
                 UNLESS AND UNTIL REGISTERED UNDER THE ACT OR, IN THE OPINION OF
                 COUNSEL SATISFACTORY TO THE ISSUER OF THESE SECURITIES, SUCH
                 OFFER, SALE OR TRANSFER, PLEDGE OR HYPOTHECATION IS IN
                 COMPLIANCE THEREWITH.

                 THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
                 CERTAIN RESTRICTIONS ON TRANSFER AND A RIGHT OF FIRST REFUSAL
                 HELD BY THE ISSUER OR ITS ASSIGNEE(S) AS SET FORTH IN THE
                 EXERCISE NOTICE BETWEEN THE ISSUER AND THE ORIGINAL HOLDER OF
                 THESE SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL
                 OFFICE OF THE ISSUER. SUCH TRANSFER


                                    -3-
<PAGE>

                 RESTRICTIONS AND RIGHT OF FIRST REFUSAL ARE BINDING ON
                 TRANSFEREES OF THESE SHARES.

                 (b) STOP-TRANSFER NOTICES. Optionee agrees that, in order to
ensure compliance with the restrictions referred to herein, the Company may
issue appropriate "stop transfer" instructions to its transfer agent, if any,
and that, if the Company transfers its own securities, it may make appropriate
notations to the same effect in its own records.

                 (c) REFUSAL TO TRANSFER. The Company shall not be required (i)
to transfer on its books any Shares that have been sold or otherwise transferred
in violation of any of the provisions of this Agreement or (ii) to treat as
owner of such Shares or to accord the right to vote or pay dividends to any
purchaser or other transferee to whom such Shares shall have been so
transferred.

         7. SUCCESSORS AND ASSIGNS. The Company may assign any of its rights
under this Agreement to single or multiple assignees, and this Agreement shall
inure to the benefit of the successors and assigns of the Company. Subject to
the restrictions on transfer herein set forth, this Agreement shall be binding
upon Optionee and his or her heirs, executors, administrators, successors and
assigns.

         8. INTERPRETATION. Any dispute regarding the interpretation of this
Agreement shall be submitted by Optionee or by the Company forthwith to the
Company's Board of Directors or the committee thereof that administers the Plan,
which shall review such dispute at its next regular meeting. The resolution of
such a dispute by the Board or committee shall be final and binding on the
Company and on Optionee.

         9. GOVERNING LAW; SEVERABILITY. This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware excluding that
body of law pertaining to conflicts of law. Should any provision of this
Agreement be determined by a court of law to be illegal or unenforceable, the
other provisions shall nevertheless remain effective and shall remain
enforceable.

         10. NOTICES. Any notice required or permitted hereunder shall be given
in writing and shall be deemed effectively given upon personal delivery or four
(4) days after deposit in the United States mail by certified mail, with postage
and fees prepaid, addressed to the other party at its address as shown below
beneath its signature, or to such other address as such party may designate in
writing from time to time to the other party.

         11. FURTHER INSTRUMENTS. The parties agree to execute such further
instruments and to take such further action as may be reasonably necessary to
carry out the purposes and intent of this Agreement.


                                      -4-
<PAGE>

         12. DELIVERY OF PAYMENT. Optionee herewith delivers to the Company the
full Exercise Price for the Shares.

         13. ENTIRE AGREEMENT. The Plan and Notice of Grant/Option Agreement are
incorporated herein by reference. This Agreement, the Plan, the Option Agreement
and the Investment Representation Statement constitute the entire agreement of
the parties with respect to the subject matter hereof and supersede in their
entirety all prior undertakings and agreements of the Company and Optionee with
respect to the subject matter hereof, and may not be modified adversely to the
Optionee's interest except by means of a writing signed by the Company and
Optionee.

Submitted by:                             Accepted by:

OPTIONEE:                                 THE CENTER FOR ADAPTIVE SYSTEMS
                                          APPLICATIONS, INC.

                                          By:
                                                --------------------------------

                                          Its:
                                                --------------------------------

      (Signature)

ADDRESS:                                  ADDRESS:

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

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


                                      -5-
<PAGE>

                                    EXHIBIT B

                       INVESTMENT REPRESENTATION STATEMENT

OPTIONEE         :

COMPANY          :       THE CENTER FOR ADAPTIVE SYSTEMS APPLICATIONS, INC.

SECURITY         :       COMMON STOCK

AMOUNT           :

DATE             :

In connection with the purchase of the above-listed Securities, the undersigned
Optionee represents to the Company the following:

                 (a) Optionee is aware of the Company's business affairs and
financial condition and has acquired sufficient information about the Company to
reach an informed and knowledgeable decision to acquire the Securities. Optionee
is acquiring these Securities for investment for Optionee's own account only and
not with a view to, or for resale in connection with, any "distribution" thereof
within the meaning of the Securities Act of 1933, as amended (the "Securities
Act").

                 (b) Optionee acknowledges and understands that the Securities
constitute "restricted securities" under the Securities Act and have not been
registered under the Securities Act in reliance upon a specific exemption
therefrom, which exemption depends upon, among other things, the BONA FIDE
nature of Optionee's investment intent as expressed herein. In this connection,
Optionee understands that, in the view of the Securities and Exchange
Commission, the statutory basis for such exemption may be unavailable if
Optionee's representation was predicated solely upon a present intention to hold
these Securities for the minimum capital gains period specified under tax
statutes, for a deferred sale, for or until an increase or decrease in the
market price of the Securities, or for a period of one year or any other fixed
period in the future. Optionee further understands that the Securities must be
held indefinitely unless they are subsequently registered under the Securities
Act or an exemption from such registration is available. Optionee further
acknowledges and understands that the Company is under no obligation to register
the Securities. Optionee understands that the certificate evidencing the
Securities will be imprinted with a legend that prohibits the transfer of the
Securities unless they are registered or such registration is not required in
the opinion of counsel satisfactory to the Company and any other legend required
under applicable state securities laws.

<PAGE>

                 (c) Optionee is familiar with the provisions of Rule 701 and
Rule 144, each promulgated under the Securities Act, which, in substance, permit
limited public resale of "restricted securities" acquired, directly or
indirectly from the issuer thereof, in a non-public offering subject to the
satisfaction of certain conditions. Rule 701 provides that if the issuer
qualifies under Rule 701 at the time of the grant of the Option to the Optionee,
the exercise will be exempt from registration under the Securities Act. In the
event the Company becomes subject to the reporting requirements of Section 13 or
15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
ninety (90) days thereafter (or such longer period as any market stand-off
agreement may require) the Securities exempt under Rule 701 may be resold,
subject to the satisfaction of certain of the conditions specified by Rule 144,
including: (1) the resale being made through a broker in an unsolicited
"broker's transaction" or in transactions directly with a market maker (as said
term is defined under the Exchange Act); and, in the case of an affiliate, (2)
the availability of certain public information about the Company, (3) the amount
of Securities being sold during any three-month period not exceeding the
limitations specified in Rule 144(e), and (4) the timely filing of a Form 144,
if applicable.

         In the event that the Company does not qualify under Rule 701 at the
time of grant of the Option, then the Securities may be resold in certain
limited circumstances subject to the provisions of Rule 144, which requires the
resale to occur not less than two years after the later of the date the
Securities were sold by the Company or the date the Securities were sold by an
affiliate of the Company, within the meaning of Rule 144; and, in the case of
acquisition of the Securities by an affiliate, or by a non-affiliate who
subsequently holds the Securities less than three years, the satisfaction of the
conditions set forth in sections (1), (2), (3) and (4) of the paragraph
immediately above.

                 (d) Optionee hereby agrees that if so requested by the Company
or any representative of the underwriters in connection with any registration of
the offering of any securities of the Company under the Securities Act, Optionee
shall not sell or otherwise transfer any Shares or other securities of the
Company during the 180-day period following the date of the final Prospectus
contained in a registration statement of the Company filed under the Securities
Act; provided, however, that such restriction shall only apply to the first
registration statement of the Company to become effective under the Securities
Act which includes securities to be sold on behalf of the Company to the public
in an underwritten public offering under the Securities Act. The Company may
impose stop-transfer instructions with respect to securities subject to the
foregoing restrictions until the end of such 180-day period.


                                      -2-
<PAGE>

                 (e) Optionee further understands that in the event all of the
applicable requirements of Rule 701 or 144 are not satisfied, registration under
the Securities Act, compliance with Regulation A, or some other registration
exemption will be required; and that, notwithstanding the fact that Rules 144
and 701 are not exclusive, the staff of the Securities and Exchange Commission
has expressed its opinion that persons proposing to sell private placement
securities other than in a registered offering and otherwise than pursuant to
Rules 144 or 701 will have a substantial burden of proof in establishing that an
exemption from registration is available for such offers or sales, and that such
persons and their respective brokers who participate in such transactions do so
at their own risk. Optionee understands that no assurances can be given that any
such other registration exemption will be available in such event.

                                   Signature of Optionee:


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

                                   -------------------------------------------
                                   Print Name

                                   Date:                     , 19
                                         --------------------    ---

<PAGE>

               THE CENTER FOR ADAPTIVE SYSTEMS APPLICATIONS, INC.

                    STOCK OPTION AGREEMENT -- EARLY EXERCISE

         Unless otherwise defined herein, the terms defined in the Stock Plan
shall have the same defined meanings in this Stock Option Agreement (the "Option
Agreement").

     NOTICE OF STOCK OPTION GRANT


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

         You have been granted an option to purchase Common Stock of the
Company, subject to the terms and conditions of the Plan and this Option
Agreement, as follows:

         Grant Number

         Date of Grant

         Vesting Commencement Date

         Exercise Price per Share

         Total Number of Shares Granted

         Total Exercise Price

         Type of Option:                          ____Incentive Stock Option

                                                  ____Nonstatutory Stock Option

         Term/Expiration Date:

         EXERCISE AND VESTING SCHEDULE:

         This Option shall be exercisable in whole or in part, and shall vest
according to the following vesting schedule:


                                      -2-
<PAGE>

         TERMINATION PERIOD:

         This Option may be exercised, to the extent it is then vested, for
sixty days after Optionee ceases to be a Service Provider. Upon death or
Disability of the Optionee, this Option may be exercised, to the extent it is
then vested, for one year after Optionee ceases to be Service Provider. In no
event shall this Option be exercised later than the Term/Expiration Date as
provided above.

     AGREEMENT

                  GRANT OF OPTION. The Administrator of the Company hereby
grants to the Optionee named in the Notice of Grant (the "Optionee"), an option
(the "Option") to purchase the number of Shares set forth in the Notice of
Grant, at the exercise price per Share set forth in the Notice of Grant (the
"Exercise Price"), and subject to the terms and conditions of the Plan, which is
incorporated herein by reference. Subject to Section 13(c) of the Plan, in the
event of a conflict between the terms and conditions of the Plan and this Option
Agreement, the terms and conditions of the Plan shall prevail.

                  If designated in the Notice of Grant as an Incentive Stock
Option ("ISO"), this Option is intended to qualify as an Incentive Stock Option
as defined in Section 422 of the Code. Nevertheless, to the extent that it
exceeds the $100,000 rule of Code Section 422(d), this Option shall be treated
as a Nonstatutory Stock Option ("NSO").

                  EXERCISE OF OPTION.  This Option shall be exercisable during
its term in accordance with the provisions of Section 9 of the Plan as follows:

                           Right to Exercise.

                                    Subject to subsections 2(a)(ii) and 2(a)
(iii) below, this Option shall be exercisable cumulatively according to the
vesting schedule set forth in the Notice of Grant. Alternatively, at the
election of the Optionee, this Option may be exercised in whole or in part at
any time as to Shares that have not yet vested. Vested Shares shall not be
subject to the Company's repurchase right (as set forth in the Restricted Stock
Purchase Agreement, attached hereto as EXHIBIT C-1).

                                    As a condition to exercising this Option for
unvested Shares, the Optionee shall execute the Restricted Stock Purchase
Agreement.

                                    This Option may not be exercised for a
fraction of a Share.

                           METHOD OF EXERCISE.  This Option shall be exercisable
by delivery of an exercise notice in the form attached as Exhibit A (the
"Exercise Notice") which shall state the election to exercise the Option, the
number of Shares with respect to which the Option is being exercised, and such
other representations and agreements as may be required by the Company. The
Exercise Notice shall be accompanied by payment of the aggregate Exercise Price
as to all Exercised Shares. This Option shall


                                      -3-
<PAGE>

be deemed to be exercised upon receipt by the Company of such fully executed
Exercise Notice accompanied by the aggregate Exercise Price.

                  No Shares shall be issued pursuant to the exercise of an
Option unless such issuance and such exercise complies with Applicable Laws.
Assuming such compliance, for income tax purposes the Shares shall be considered
transferred to the Optionee on the date on which the Option is exercised with
respect to such Shares.

                  OPTIONEE'S REPRESENTATIONS. In the event the Shares have not
been registered under the Securities Act of 1933, as amended, at the time this
Option is exercised, the Optionee shall, if required by the Company,
concurrently with the exercise of all or any portion of this Option, deliver to
the Company his or her Investment Representation Statement in the form attached
hereto as EXHIBIT B, and shall read the applicable rules of the Commissioner of
Corporations attached to such Investment Representation Statement.

                  LOCK-UP PERIOD. Optionee hereby agrees that, if so requested
by the Company or any representative of the underwriters (the "Managing
Underwriter") in connection with any registration of the offering of any
securities of the Company under the Securities Act, Optionee shall not sell or
otherwise transfer any Shares or other securities of the Company during the
180-day period (or such other period as may be requested in writing by the
Managing Underwriter and agreed to in writing by the Company) (the "Market
Standoff Period") following the effective date of a registration statement of
the Company filed under the Securities Act. Such restriction shall apply only to
the first registration statement of the Company to become effective under the
Securities Act that includes securities to be sold on behalf of the Company to
the public in an underwritten public offering under the Securities Act. The
Company may impose stop-transfer instructions with respect to securities subject
to the foregoing restrictions until the end of such Market Standoff Period.

                  METHOD OF PAYMENT.  Payment of the aggregate Exercise Price
shall be by any of the following, or a combination thereof, at the election of
the Optionee:

                           cash;

                           check;

                           consideration received by the Company under a formal
cashless exercise program adopted by the Company in connection with the Plan; or

                           surrender of other Shares which, (i) in the case of
Shares acquired upon exercise of an option, have been owned by the Optionee for
more than six (6) months on the date of surrender, and (ii) have a Fair Market
Value on the date of surrender equal to the aggregate Exercise Price of the
Exercised Shares.

                  RESTRICTIONS ON EXERCISE. This Option may not be exercised
until such time as the Plan has been approved by the shareholders of the
Company, or if the issuance of such Shares upon such


                                      -4-
<PAGE>

exercise or the method of payment of consideration for such shares would
constitute a violation of any Applicable Law.

                  NON-TRANSFERABILITY OF OPTION. This Option may not be
transferred in any manner otherwise than by will or by the laws of descent or
distribution and may be exercised during the lifetime of Optionee only by
Optionee. The terms of the Plan and this Option Agreement shall be binding upon
the executors, administrators, heirs, successors and assigns of the Optionee.

                  TERM OF OPTION. This Option may be exercised only within the
term set out in the Notice of Grant, and may be exercised during such term only
in accordance with the Plan and the terms of this Option.

                  TAX CONSEQUENCES. Set forth below is a brief summary as of the
date of this Option of some of the federal tax consequences of exercise of this
Option and disposition of the Shares. THIS SUMMARY IS NECESSARILY INCOMPLETE,
AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. THE OPTIONEE SHOULD
CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING OF THE SHARES.

                           EXERCISE OF NSO.  There may be a regular federal
income tax liability upon the exercise of an NSO. The Optionee will be treated
as having received compensation income (taxable at ordinary income tax rates)
equal to the excess, if any, of the Fair Market Value of the Exercised Shares on
the date of exercise over the Exercise Price. If Optionee is an Employee or a
former Employee, the Company will be required to withhold from Optionee's
compensation or collect from Optionee and pay to the applicable taxing
authorities an amount in cash equal to a percentage of this compensation income
at the time of exercise, and may refuse to honor the exercise and refuse to
deliver Shares if such withholding amounts are not delivered at the time of
exercise.

                           EXERCISE OF ISO.  If this Option qualifies as an ISO,
there will be no regular federal income tax liability upon the exercise of the
Option, although the excess, if any, of the Fair Market Value of the Exercised
Shares on the date of exercise over the Exercise Price will be treated as an
adjustment to the alternative minimum tax for federal tax purposes and may
subject the Optionee to the alternative minimum tax in the year of exercise.

                           DISPOSITION OF SHARES.  In the case of an NSO, if
Shares are held for at least one year, any gain realized on disposition of the
Shares will be treated as long-term capital gain for federal income tax
purposes. In the case of an ISO, if Shares transferred pursuant to the Option
are held for at least one year after exercise and at least two years after the
Date of Grant, any gain realized on disposition of the Shares will also be
treated as long-term capital gain for federal income tax purposes. If Shares
purchased under an ISO are disposed of within one year after exercise or two
years after the Date of Grant, any gain realized on such disposition will be
treated as compensation income (taxable at ordinary income rates) to the extent
of the difference between the Exercise Price of the Exercised Shares and the
lesser of (i) the Fair Market Value of the Exercised Shares on the date of
exercise, or (ii) the sale price of the Exercised Shares. Different rules may
apply if the Shares are subject to a substantial risk of forfeiture (within the
meaning of Section 83 of the Code) at the time of purchase. Any additional gain
will be taxed as capital gain, short-term depending on the period that the ISO
Shares were held.


                                      -5-
<PAGE>

                           NOTICE OF DISQUALIFYING DISPOSITION OF ISO SHARES.
If the Option granted to Optionee herein is an ISO, and if Optionee sells or
otherwise disposes of any of the Shares acquired pursuant to the ISO on or
before the later of (i) the date two years after the Date of Grant, or (ii) the
date one year after the date of exercise, the Optionee shall immediately notify
the Company in writing of such disposition. Optionee agrees that Optionee may be
subject to income tax withholding by the Company on the compensation income
recognized by the Optionee.

                           SECTION 83(b) ELECTION FOR UNVESTED SHARES PURCHASED
PURSUANT TO OPTIONS. With respect to the exercise of an Option for unvested
Shares, an election (the "Election") may be filed by the Optionee with the
Internal Revenue Service, WITHIN 30 DAYS of the purchase of the Shares, electing
pursuant to Section 83(b) of the Code to be taxed currently on any difference
between the purchase price of the Shares and their Fair Market Value on the date
of purchase. In the case of an NSO, this will result in a recognition of taxable
income to the Optionee on the date of exercise, measured by the excess, if any,
of the Fair Market Value of the Exercised Shares, at the time the Option is
exercised over the purchase price for the Exercised Shares. Absent such an
election, taxable income will be measured and recognized by Optionee at the time
or times on which the Company's Repurchase Option lapses. In the case of an ISO,
such an election will result in a recognition of income to the Optionee for
alternative minimum tax purposes on the date of exercise, measured by the
excess, if any, of the Fair Market Value of the Exercised Shares, at the time
the Option is exercised, over the purchase price for the Exercised Shares.
Absent such an election, alternative minimum taxable income will be measured and
recognized by Optionee at the time or times on which the Company's Repurchase
Option lapses. Optionee is strongly encouraged to seek the advice of his or her
own tax consultants in connection with the purchase of the Shares and the
advisability of filing of the Election under Section 83(b) of the Code. A form
of Election under Section 83(b) is attached hereto as EXHIBIT C-5 for reference.

                           OPTIONEE ACKNOWLEDGES THAT IT IS OPTIONEE'S SOLE
RESPONSIBILITY AND NOT THE COMPANY'S TO FILE TIMELY THE ELECTION UNDER SECTION
83(b), EVEN IF OPTIONEE REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO MAKE THIS
FILING ON OPTIONEE'S BEHALF.

                  ENTIRE AGREEMENT; GOVERNING LAW. The Plan is incorporated
herein by reference. The Plan and this Option Agreement constitute the entire
agreement of the parties with respect to the subject matter hereof and supersede
in their entirety all prior undertakings and agreements of the Company and
Optionee with respect to the subject matter hereof, and may not be modified
adversely to the Optionee's interest except by means of a writing signed by the
Company and Optionee. This Option Agreement is governed by the internal
substantive laws but not the choice of law rules of California.

                  NO GUARANTEE OF CONTINUED SERVICE. OPTIONEE ACKNOWLEDGES AND
AGREES THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS
EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (NOT
THROUGH THE ACT OF BEING HIRED, BEING GRANTED THIS OPTION OR ACQUIRING SHARES
HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE
TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO
NOT CONSTITUTE AN EXPRESS


                                      -6-
<PAGE>

OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE
VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE IN ANY WAY
WITH OPTIONEE'S RIGHT OR THE COMPANY'S RIGHT TO TERMINATE OPTIONEE'S
RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT CAUSE.

                  Optionee acknowledges receipt of a copy of the Plan and
represents that he or she is familiar with the terms and provisions thereof, and
hereby accepts this Option subject to all of the terms and provisions thereof.
Optionee has reviewed the Plan and this Option in their entirety, has had an
opportunity to obtain the advice of counsel prior to executing this Option and
fully understands all provisions of the Option. Optionee hereby agrees to accept
as binding, conclusive and final all decisions or interpretations of the
Administrator upon any questions arising under the Plan or this Option. Optionee
further agrees to notify the Company upon any change in the residence address
indicated below.

OPTIONEE                                       THE CENTER FOR ADAPTIVE SYSTEMS
                                               APPLICATIONS, INC.

---------------------------------              ---------------------------------
Signature                                      By

---------------------------------              ---------------------------------
Print Name                                     Title

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

---------------------------------
Residence Address


                                      -7-

<PAGE>

                                    EXHIBIT A

                                   STOCK PLAN

                                 EXERCISE NOTICE

The Center for Adaptive Systems Applications, Inc.
1911 Central Avenue
Los Alamos, NM 87544-3023

Attention:  Secretary

      1.   EXERCISE OF OPTION. Effective as of today, ________________, ____,
the undersigned ("Optionee") hereby elects to exercise Optionee's option (the
"Option") to purchase ________________ shares of the Common Stock (the
"Shares") of The Center for Adaptive Systems Applications, Inc. (the "Company")
under and pursuant to the 1995 Stock Plan (the "Plan") and the Stock Option
Agreement dated ______________, _____ (the "Option Agreement").

           DELIVERY OF PAYMENT.  Purchaser herewith delivers to the Company the
full purchase price of the Shares, as set forth in the Option Agreement.

           REPRESENTATIONS OF OPTIONEE. Optionee acknowledges that Optionee has
received, read and understood the Plan and the Option Agreement and agrees to
abide by and be bound by their terms and conditions.

           RIGHTS AS SHAREHOLDER. Until the issuance of the Shares (as
evidenced by the appropriate entry on the books of the Company or of a duly
authorized transfer agent of the Company), no right to vote or receive
dividends or any other rights as a shareholder shall exist with respect to the
optioned stock, notwithstanding the exercise of the Option. The Shares shall be
issued to the Optionee as soon as practicable after the Option is exercised. No
adjustment shall be made for a dividend or other right for which the record
date is prior to the date of issuance except as provided in Section 12 of the
Plan.

           COMPANY'S RIGHT OF FIRST REFUSAL. Before any Shares held by Optionee
or any transferee (either being sometimes referred to herein as the "Holder")
may be sold or otherwise transferred (including transfer by gift or operation
of law), the Company or its assignee(s) shall have a right of first refusal to
purchase the Shares on the terms and conditions set forth in this Section (the
"Right of First Refusal").

                NOTICE OF PROPOSED TRANSFER.  The Holder of the Shares shall
deliver to the Company a written notice (the "Notice") stating: (i) the
Holder's bona fide intention to sell or otherwise transfer such Shares; (ii)
the name of each proposed purchaser or other transferee ("Proposed
Transferee"); (iii) the number of Shares to be transferred to each Proposed
Transferee; and (iv) the bona fide cash price or other consideration for which
the Holder proposes to transfer the Shares (the "Offered Price"), and the
Holder shall offer the Shares at the Offered Price to the Company or its
assignee(s).



<PAGE>

                EXERCISE OF RIGHT OF FIRST REFUSAL.  At any time within thirty
(30) days after receipt of the Notice, the Company and/or its assignee(s) may,
by giving written notice to the Holder, elect to purchase all, but not less
than all, of the Shares proposed to be transferred to any one or more of the
Proposed Transferees, at the purchase price determined in accordance with
subsection (c) below.

                PURCHASE PRICE.  The purchase price ("Purchase Price") for the
Shares purchased by the Company or its assignee(s) under this Section shall be
the Offered Price. If the Offered Price includes consideration other than cash,
the cash equivalent value of the non-cash consideration shall be determined by
the Board of Directors of the Company in good faith.

                PAYMENT. Payment of the Purchase Price shall be made, at the
option of the Company or its assignee(s), in cash (by check), by cancellation
of all or a portion of any outstanding indebtedness of the Holder to the
Company (or, in the case of repurchase by an assignee, to the assignee), or by
any combination thereof within 30 days after receipt of the Notice or in the
manner and at the times set forth in the Notice.

                HOLDER'S RIGHT TO TRANSFER. If all of the Shares proposed in
the Notice to be transferred to a given Proposed Transferee are not purchased
by the Company and/or its assignee(s) as provided in this Section, then the
Holder may sell or otherwise transfer such Shares to that Proposed Transferee
at the Offered Price or at a higher price, provided that such sale or other
transfer is consummated within 120 days after the date of the Notice, that any
such sale or other transfer is effected in accordance with any applicable
securities laws and that the Proposed Transferee agrees in writing that the
provisions of this Section shall continue to apply to the Shares in the hands
of such Proposed Transferee. If the Shares described in the Notice are not
transferred to the Proposed Transferee within such period, a new Notice shall
be given to the Company, and the Company and/or its assignees shall again be
offered the Right of First Refusal before any Shares held by the Holder may be
sold or otherwise transferred.

                EXCEPTION FOR CERTAIN FAMILY TRANSFERS. Anything to the
contrary contained in this Section notwithstanding, the transfer of any or all
of the Shares during the Optionee's lifetime or on the Optionee's death by will
or intestacy to the Optionee's immediate family or a trust for the benefit of
the Optionee's immediate family shall be exempt from the provisions of this
Section. "Immediate Family" as used herein shall mean spouse, lineal descendant
or antecedent, father, mother, brother or sister. In such case, the transferee
or other recipient shall receive and hold the Shares so transferred subject to
the provisions of this Section, and there shall be no further transfer of such
Shares except in accordance with the terms of this Section.


                                      -2-
<PAGE>

                TERMINATION OF RIGHT OF FIRST REFUSAL. The Right of First
Refusal shall terminate as to any Shares upon the first sale of Common Stock of
the Company to the general public pursuant to a registration statement filed
with and declared effective by the Securities and Exchange Commission under the
Securities Act of 1933, as amended.

      2.   TAX CONSULTATION. Optionee understands that Optionee may suffer
adverse tax consequences as a result of Optionee's purchase or disposition of
the Shares. Optionee represents that Optionee has consulted with any tax
consultants Optionee deems advisable in connection with the purchase or
disposition of the Shares and that Optionee is not relying on the Company for
any tax advice.

      3.   RESTRICTIVE LEGENDS AND STOP-TRANSFER ORDERS.

                LEGENDS. Optionee understands and agrees that the Company shall
cause the legends set forth below or legends substantially equivalent thereto,
to be placed upon any certificate(s) evidencing ownership of the Shares
together with any other legends that may be required by the Company or by state
or federal securities laws:

                THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED
                UNDER THE SECURITIES ACT OF 1933 (THE "ACT") AND MAY NOT BE
                OFFERED, SOLD OR OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED
                UNLESS AND UNTIL REGISTERED UNDER THE ACT OR, IN THE OPINION OF
                COMPANY COUNSEL SATISFACTORY TO THE ISSUER OF THESE SECURITIES,
                SUCH OFFER, SALE OR TRANSFER, PLEDGE OR HYPOTHECATION IS IN
                COMPLIANCE THEREWITH.

                THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
                CERTAIN RESTRICTIONS ON TRANSFER AND RIGHT OF FIRST REFUSAL
                OPTIONS HELD BY THE ISSUER OR ITS ASSIGNEE(S) AS SET FORTH IN
                THE EXERCISE NOTICE BETWEEN THE ISSUER AND THE ORIGINAL HOLDER
                OF THESE SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE
                PRINCIPAL OFFICE OF THE ISSUER. SUCH TRANSFER RESTRICTIONS AND
                RIGHT OF FIRST REFUSAL ARE BINDING ON TRANSFEREES OF THESE
                SHARES.

                IT IS UNLAWFUL TO CONSUMMATE A SALE OR TRANSFER OF THIS
                SECURITY, OR ANY INTEREST THEREIN, OR TO RECEIVE ANY
                CONSIDERATION THEREFOR, WITHOUT THE PRIOR WRITTEN CONSENT OF
                THE COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA,
                EXCEPT AS PERMITTED IN THE COMMISSIONER'S RULES.


                                      -3-
<PAGE>

                Optionee understands that transfer of the Shares may be
                restricted by Section 260.141.11 of the Rules of the California
                Corporations Commissioner, a copy of which is attached to
                EXHIBIT B, the Investment Representation Statement.

                STOP-TRANSFER NOTICES. Optionee agrees that, in order to ensure
compliance with the restrictions referred to herein, the Company may issue
appropriate "stop transfer" instructions to its transfer agent, if any, and
that, if the Company transfers its own securities, it may make appropriate
notations to the same effect in its own records.

                REFUSAL TO TRANSFER. The Company shall not be required (i) to
transfer on its books any Shares that have been sold or otherwise transferred
in violation of any of the provisions of this Exercise Notice or (ii) to treat
as owner of such Shares or to accord the right to vote or pay dividends to any
purchaser or other transferee to whom such Shares shall have been so
transferred.

           SUCCESSORS AND ASSIGNS. The Company may assign any of its rights
under this Exercise Notice to single or multiple assignees, and the terms and
conditions of this Exercise Notice shall inure to the benefit of the successors
and assigns of the Company. Subject to the restrictions on transfer herein set
forth, the terms and conditions of this Exercise Notice shall be binding upon
Optionee and his or her heirs, executors, administrators, successors and
assigns.

           INTERPRETATION. Any dispute regarding the interpretation of this
Exercise Notice shall be submitted by Optionee or by the Company forthwith to
the Administrator which shall review such dispute at its next regular meeting.
The resolution of such a dispute by the Administrator shall be final and
binding on all parties.

           GOVERNING LAW; SEVERABILITY.  This Exercise Notice is governed by
the internal substantive laws, but not the choice of law rules, of New Mexico.


                                      -4-
<PAGE>

           ENTIRE AGREEMENT. The Plan and Option Agreement are incorporated
herein by reference. This Exercise Notice, the Plan, the Restricted Stock
Purchase Agreement, the Option Agreement and the Investment Representation
Statement constitute the entire agreement of the parties with respect to the
subject matter hereof and supersede in their entirety all prior undertakings
and agreements of the Company and Optionee with respect to the subject matter
hereof, and may not be modified adversely to the Optionee's interest except by
means of a writing signed by the Company and Optionee.

Submitted by:                                Accepted by:

OPTIONEE                                     THE CENTER FOR ADAPTIVE SYSTEMS
                                             APPLICATIONS, INC.

-----------------------------------          -----------------------------------
Signature                                    By

-----------------------------------          -----------------------------------
Print Name                                   Its


ADDRESS:                                     ADDRESS:
                                             1911 Central Avenue
-----------------------------------          Los Alamos, NM 87544-3023

                                             -----------------------------------
                                             Date Received


                                      -5-
<PAGE>



                                    EXHIBIT B

                       INVESTMENT REPRESENTATION STATEMENT

OPTIONEE        :
COMPANY         :       THE CENTER FOR ADAPTIVE SYSTEMS APPLICATIONS,
INC.
SECURITY        :       COMMON STOCK
AMOUNT          :
DATE            :
In connection with the purchase of the above-listed Securities, the undersigned
Optionee represents to the Company the following:

                Optionee is aware of the Company's business affairs and
financial condition and has acquired sufficient information about the Company
to reach an informed and knowledgeable decision to acquire the Securities.
Optionee is acquiring these Securities for investment for Optionee's own
account only and not with a view to, or for resale in connection with, any
"distribution" thereof within the meaning of the Securities Act of 1933, as
amended (the "Securities Act").

                Optionee acknowledges and understands that the Securities
constitute "restricted securities" under the Securities Act and have not been
registered under the Securities Act in reliance upon a specific exemption
therefrom, which exemption depends upon, among other things, the bona fide
nature of Optionee's investment intent as expressed herein. In this connection,
Optionee understands that, in the view of the Securities and Exchange
Commission, the statutory basis for such exemption may be unavailable if
Optionee's representation was predicated solely upon a present intention to
hold these Securities for the minimum capital gains period specified under tax
statutes, for a deferred sale, for or until an increase or decrease in the
market price of the Securities, or for a period of one year or any other fixed
period in the future. Optionee further understands that the Securities must be
held indefinitely unless they are subsequently registered under the Securities
Act or an exemption from such registration is available. Optionee further
acknowledges and understands that the Company is under no obligation to
register the Securities. Optionee understands that the certificate evidencing
the Securities will be imprinted with a legend which prohibits the transfer of
the Securities unless they are registered or such registration is not required
in the opinion of counsel satisfactory to the Company, a legend prohibiting
their transfer without the consent of the Commissioner of Corporations of the
State of California and with any other legend required under applicable state
securities laws.

                Optionee is familiar with the provisions of Rule 701 and Rule
144, each promulgated under the Securities Act, which, in substance, permit
limited public resale of "restricted securities" acquired, directly or
indirectly from the issuer thereof, in a non-public offering subject to the
satisfaction of certain conditions. Rule 701 provides that if the issuer
qualifies under Rule 701 at the time of the grant of the Option to the
Optionee, the exercise will be exempt from registration under the Securities
Act. In the event the Company becomes subject to the reporting requirements of
Section 13 or 15(d) of the Securities Exchange Act of 1934, ninety (90) days
thereafter (or such longer period as any market stand-off agreement may
require) the Securities exempt under Rule 701 may be resold, subject to the
satisfaction of certain of the conditions specified by Rule 144, including: (1)
the resale being made through a broker in an unsolicited "broker's transaction"
or in transactions directly with a


<PAGE>

market maker (as said term is defined under the Securities Exchange Act of
1934); and, in the case of an affiliate, (2) the availability of certain public
information about the Company, (3) the amount of Securities being sold during
any three month period not exceeding the limitations specified in Rule 144(e),
and (4) the timely filing of a Form 144, if applicable.

                In the event that the Company does not qualify under Rule 701
at the time of grant of the Option, then the Securities may be resold in
certain limited circumstances subject to the provisions of Rule 144, which
requires the resale to occur not less than one year after the later of the date
the Securities were sold by the Company or the date the Securities were sold by
an affiliate of the Company, within the meaning of Rule 144; and, in the case
of acquisition of the Securities by an affiliate, or by a non-affiliate who
subsequently holds the Securities less than two years, the satisfaction of the
conditions set forth in sections (1), (2), (3) and (4) of the paragraph
immediately above.

                Optionee further understands that in the event all of the
applicable requirements of Rule 701 or 144 are not satisfied, registration
under the Securities Act, compliance with Regulation A, or some other
registration exemption will be required; and that, notwithstanding the fact
that Rules 144 and 701 are not exclusive, the Staff of the Securities and
Exchange Commission has expressed its opinion that persons proposing to sell
private placement securities other than in a registered offering and otherwise
than pursuant to Rules 144 or 701 will have a substantial burden of proof in
establishing that an exemption from registration is available for such offers
or sales, and that such persons and their respective brokers who participate in
such transactions do so at their own risk. Optionee understands that no
assurances can be given that any such other registration exemption will be
available in such event.

                Optionee understands that the certificate evidencing the
Securities will be imprinted with a legend that prohibits the transfer of the
Securities without the consent of the Commissioner of Corporations of
California. Optionee has read the applicable Commissioner's Rules with respect
to such restriction, a copy of which is attached.

                                                Signature of Optionee:

                                                ________________________________

                                                Date:___________________________


                                      -2-
<PAGE>


                                  ATTACHMENT 1

              STATE OF CALIFORNIA - CALIFORNIA ADMINISTRATIVE CODE
         Title 10. Investment - Chapter 3. Commissioner of Corporations

     260.141.11: RESTRICTION ON TRANSFER. (a)    The issuer of any security upon
which a restriction on transfer has been imposed pursuant to Sections 260.102.6,
260.141.10 or 260.534 shall cause a copy of this section to be delivered to each
issuee or transferee of such security at the time the certificate evidencing the
security is delivered to the issuee or transferee.

         (b)  It is unlawful for the holder of any such security to consummate a
              sale or transfer of such security, or any interest therein,
              without the prior written consent of the Commissioner (until this
              condition is removed pursuant to Section 260.141.12 of these
              rules), except:

                  to the issuer;

                  pursuant to the order or process of any court;

                  to any person described in Subdivision (i) of Section 25102 of
     the Code or Section 260.105.14 of these rules;

                  to the transferor's ancestors, descendants or spouse, or any
     custodian or trustee for the account of the transferor or the transferor's
     ancestors, descendants, or spouse; or to a transferee by a trustee or
     custodian for the account of the transferee or the transferee's ancestors,
     descendants or spouse;

                  to holders of securities of the same class of the same issuer;

                  by way of gift or donation inter vivos or on death;

                  by or through a broker-dealer licensed under the Code (either
     acting as such or as a finder) to a resident of a foreign state, territory
     or country who is neither domiciled in this state to the knowledge of the
     broker-dealer, nor actually present in this state if the sale of such
     securities is not in violation of any securities law of the foreign state,
     territory or country concerned;

                  to a broker-dealer licensed under the Code in a principal
     transaction, or as an underwriter or member of an underwriting  syndicate
     or selling group;

                  if the interest sold or transferred is a pledge or other lien
     given by the purchaser to the seller upon a sale of the security for which
     the Commissioner's written consent is obtained or under this rule not
     required;

                  by way of a sale qualified under Sections 25111, 25112, 25113
     or 25121 of the Code, of the securities to be transferred, provided that no
     order under Section 25140 or subdivision (a) of Section 25143 is in effect
     with respect to such qualification;

                  by a corporation to a wholly owned subsidiary of such
     corporation, or by a wholly owned subsidiary of a corporation to such
     corporation;

                  by way of an exchange qualified under Section 25111, 25112 or
     25113 of the Code, provided that no order under Section 25140 or
     subdivision (a) of Section 25143 is in effect with respect to such
     qualification;

                  between residents of foreign states, territories or countries
     who are neither domiciled nor actually present in this state;

                  to the State Controller pursuant to the Unclaimed Property Law
     or to the administrator of the unclaimed property law of another state; or

                  by the State Controller pursuant to the Unclaimed Property Law
     or by the administrator of the unclaimed property law of another state if,
     in either such case, such person (i) discloses to potential purchasers at
     the sale that transfer of the securities is restricted under this rule,
     (ii) delivers to each purchaser a copy of this rule, and (iii) advises the
     Commissioner of the name of each purchaser;

                  by a trustee to a successor trustee when such transfer does
     not involve a change in the beneficial ownership of the securities;

                  by way of an offer and sale of outstanding securities in an
     issuer transaction that is subject to the qualification requirement of
     Section 25110 of the Code but exempt from that qualification requirement by
     subdivision (f) of Section 25102; provided that any such transfer is on the
     condition that any certificate evidencing the security issued to such
     transferee shall contain the legend required by this section.

         (c)  The certificates representing all such securities subject to such
              a restriction on transfer, whether upon initial issuance or upon
              any transfer thereof, shall bear on their face a legend,
              prominently stamped or printed thereon in capital letters of not
              less than 10-point size, reading as follows:

         "IT IS UNLAWFUL TO CONSUMMATE A SALE OR TRANSFER OF THIS SECURITY, OR
         ANY INTEREST THEREIN, OR TO RECEIVE ANY CONSIDERATION THEREFOR, WITHOUT
         THE PRIOR WRITTEN CONSENT OF THE COMMISSIONER OF CORPORATIONS OF THE
         STATE OF CALIFORNIA, EXCEPT AS PERMITTED IN THE COMMISSIONER'S RULES.


<PAGE>

                                   EXHIBIT C-1

               THE CENTER FOR ADAPTIVE SYSTEMS APPLICATIONS, INC.

                                 1995 STOCK PLAN

                       RESTRICTED STOCK PURCHASE AGREEMENT

         THIS AGREEMENT is made between Jerry Y. Wind (the "Purchaser") and The
Center for Adaptive Systems Applications, Inc. (the "Company") as of September
___, 1999.

         Unless otherwise defined herein, the terms defined in the 1995 Stock
Plan shall have the same defined meanings in this Agreement.

                                    RECITALS

         A.   Pursuant to the exercise of the option (grant number ____)
granted to Purchaser under the Plan and pursuant to the Option Agreement dated
_______________, ____ by and between the Company and Purchaser with respect to
such grant (the "Option"), which Plan and Option Agreement are hereby
incorporated by reference, Purchaser has elected to purchase _________ of those
shares of Common Stock which have not become vested under the vesting schedule
set forth in the Option Agreement ("Unvested Shares"). The Unvested Shares and
the shares subject to the Option Agreement which have become vested are
sometimes collectively referred to herein as the "Shares".

         B.   As required by the Option Agreement, as a condition to
Purchaser's election to exercise the option, Purchaser must execute this
Agreement, which sets forth the rights and obligations of the parties with
respect to Shares acquired upon exercise of the Option.

              REPURCHASE OPTION.

                If Purchaser's status as a Service Provider is terminated for
any reason, including for cause, death, and Disability, the Company shall have
the right and option to purchase from Purchaser, or Purchaser's personal
representative, as the case may be, all of the Purchaser's Unvested Shares as
of the date of such termination at the price paid by the Purchaser for such
Shares (the "Repurchase Option").

                Upon the occurrence of such termination, the Company may
exercise its Repurchase Option by delivering personally or by registered mail,
to Purchaser (or his transferee or legal representative, as the case may be),
within ninety (90) days of the termination, a notice in writing indicating the
Company's intention to exercise the Repurchase Option and setting forth a date
for closing not later than thirty (30) days from the mailing of such notice.
The closing shall take place at the Company's office. At the closing, the
holder of the certificates for the Unvested Shares being transferred shall
deliver the stock certificate or certificates evidencing the Unvested Shares,
and the Company shall deliver the purchase price therefor.


<PAGE>

                At its option, the Company may elect to make payment for the
Unvested Shares to a bank selected by the Company. The Company shall avail
itself of this option by a notice in writing to Purchaser stating the name and
address of the bank, date of closing, and waiving the closing at the Company's
office.

                If the Company does not elect to exercise the Repurchase Option
conferred above by giving the requisite notice within ninety (90) days
following the termination, the Repurchase Option shall terminate.

                The Repurchase Option shall terminate in accordance with the
vesting schedule contained in Optionee's Option Agreement.

           TRANSFERABILITY OF THE SHARES; ESCROW.

                Purchaser hereby authorizes and directs the Secretary of the
Company, or such other person designated by the Company, to transfer the
Unvested Shares as to which the Repurchase Option has been exercised from
Purchaser to the Company.

                To insure the availability for delivery of Purchaser's Unvested
Shares upon repurchase by the Company pursuant to the Repurchase Option under
Section 1, Purchaser hereby appoints the Secretary, or any other person
designated by the Company as escrow agent, as its attorney-in-fact to sell,
assign and transfer unto the Company, such Unvested Shares, if any, repurchased
by the Company pursuant to the Repurchase Option and shall, upon execution of
this Agreement, deliver and deposit with the Secretary of the Company, or such
other person designated by the Company, the share certificates representing the
Unvested Shares, together with the stock assignment duly endorsed in blank,
attached hereto as EXHIBIT C-2. The Unvested Shares and stock assignment shall
be held by the secretary in escrow, pursuant to the Joint Escrow Instructions
of the Company and Purchaser attached as EXHIBIT C-3 hereto, until the Company
exercises its Repurchase Option, until such Unvested Shares are vested, or
until such time as this Agreement no longer is in effect. As a further
condition to the Company's obligations under this Agreement, the spouse of the
Purchaser, if any, shall execute and deliver to the Company the Consent of
Spouse attached hereto as EXHIBIT C-4. Upon vesting of the Unvested Shares, the
escrow agent shall promptly deliver to the Purchaser the certificate or
certificates representing such Shares in the escrow agent's possession
belonging to the Purchaser, and the escrow agent shall be discharged of all
further obligations hereunder; provided, however, that the escrow agent shall
nevertheless retain such certificate or certificates as escrow agent if so
required pursuant to other restrictions imposed pursuant to this Agreement.

                The Company, or its designee, shall not be liable for any act
it may do or omit to do with respect to holding the Shares in escrow and while
acting in good faith and in the exercise of its judgment.

                Transfer or sale of the Shares is subject to restrictions on
transfer imposed by any applicable state and federal securities laws. Any
transferee shall hold such Shares subject to all the provisions hereof and the
Exercise Notice executed by the Purchaser with respect to any Unvested Shares
purchased by Purchaser and shall acknowledge the same by signing a copy of this
Agreement.


                                      -2-

<PAGE>

                  OWNERSHIP, VOTING RIGHTS, DUTIES. This Agreement shall not
affect in any way the ownership, voting rights or other rights or duties of
Purchaser, except as specifically provided herein.

                  LEGENDS. The share certificate evidencing the Shares issued
hereunder shall be endorsed with the following legend (in addition to any legend
required under applicable federal and state securities laws):

                  THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
                  CERTAIN RESTRICTIONS UPON TRANSFER AND RIGHTS OF REPURCHASE AS
                  SET FORTH IN AN AGREEMENT BETWEEN THE COMPANY AND THE
                  STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF
                  THE COMPANY.

                  ADJUSTMENT FOR STOCK SPLIT. All references to the number of
Shares and the purchase price of the Shares in this Agreement shall be
appropriately adjusted to reflect any stock split, stock dividend or other
change in the Shares which may be made by the Company pursuant to Section 12 of
the Plan after the date of this Agreement.

                  NOTICES. Notices required hereunder shall be given in person
or by registered mail to the address of Purchaser shown on the records of the
Company, and to the Company at their respective principal executive offices.

                  SURVIVAL OF TERMS. This Agreement shall apply to and bind
Purchaser and the Company and their respective permitted assignees and
transferees, heirs, legatees, executors, administrators and legal successors.

                  SECTION 83(b) ELECTION. Purchaser hereby acknowledges that he
or she has been informed that, with respect to the exercise of an Option for
Unvested Shares, an election (the "Election") may be filed by the Purchaser with
the Internal Revenue Service, within 30 days of the purchase of the exercised
Shares, electing pursuant to Section 83(b) of the Code to be taxed currently on
any difference between the purchase price of the exercised Shares and their Fair
Market Value on the date of purchase. In the case of a Nonstatutory Stock
Option, this will result in a recognition of taxable income to the Purchaser on
the date of exercise, measured by the excess, if any, of the Fair Market Value
of the exercised Shares, at the time the Option is exercised over the purchase
price for the exercised Shares. Absent such an Election, taxable income will be
measured and recognized by Purchaser at the time or times on which the Company's
Repurchase Option lapses. In the case of an Incentive Stock Option, such an
Election will result in a recognition of income to the Purchaser for alternative
minimum tax purposes on the date of exercise, measured by the excess, if any, of
the Fair Market Value of the exercised Shares, at the time the option is
exercised, over the purchase price for the exercised Shares. Absent such an
Election, alternative minimum taxable income will be measured and recognized by
Purchaser at the time or times on which the Company's Repurchase Option lapses.
Purchaser is strongly encouraged to seek the advice of his or her own tax
consultants in connection with the purchase of the Shares and the advisability
of filing of the Election under Section 83(b) of the Code. A form of Election
under Section 83(b) is attached hereto as Exhibit C-5 for reference.


                                      -3-
<PAGE>

                  PURCHASER ACKNOWLEDGES THAT IT IS PURCHASER'S SOLE
RESPONSIBILITY AND NOT THE COMPANY'S TO FILE TIMELY THE ELECTION UNDER SECTION
83(b) OF THE CODE, EVEN IF PURCHASER REQUESTS THE COMPANY OR ITS REPRESENTATIVE
TO MAKE THIS FILING ON PURCHASER'S BEHALF.

                  REPRESENTATIONS. Purchaser has reviewed with his own tax
advisors the federal, state, local and foreign tax consequences of this
investment and the transactions contemplated by this Agreement. Purchaser is
relying solely on such advisors and not on any statements or representations of
the Company or any of its agents. Purchaser understands that he (and not the
Company) shall be responsible for his own tax liability that may arise as a
result of this investment or the transactions contemplated by this Agreement.

                  GOVERNING LAW. This Agreement shall be governed by the
internal substantive laws, but not the choice of law rules, of California.

         Purchaser represents that he has read this Agreement and is familiar
with its terms and provisions. Purchaser hereby agrees to accept as binding,
conclusive and final all decisions or interpretations of the Board upon any
questions arising under this Agreement.


                                      -4-
<PAGE>

         IN WITNESS WHEREOF, this Agreement is deemed made as of the date first
set forth above.

OPTIONEE                                       THE CENTER FOR ADAPTIVE SYSTEMS
                                               APPLICATIONS, INC.

---------------------------------              ---------------------------------
Signature                                      By

---------------------------------              ---------------------------------
Print Name                                     Title

---------------------------------
---------------------------------
Residence Address

Dated:                         ,
      -------------------------  -------


                                      -5-
<PAGE>

                                   EXHIBIT C-2

                      ASSIGNMENT SEPARATE FROM CERTIFICATE

         FOR VALUE RECEIVED I, __________________________, hereby sell, assign
and transfer unto The Center for Adaptive Systems Applications, Inc.
_____________________ (__________) shares of the Common Stock of The Center for
Adaptive Systems Applications, Inc. standing in my name of the books of said
corporation represented by Certificate No. _____ herewith and do hereby
irrevocably constitute and appoint _______________ to transfer the said stock on
the books of the within named corporation with full power of substitution in the
premises.

         This Stock Assignment may be used only in accordance with the
Restricted Stock Purchase Agreement between The Center for Adaptive Systems
Applications, Inc. and the undersigned dated ______________, _____.

Dated: _______________,____             Signature:______________________________



INSTRUCTIONS: Please do not fill in any blanks other than the signature line.
The purpose of this assignment is to enable the Company to exercise its
"repurchase option," as set forth in the Agreement, without requiring additional
signatures on the part of the Purchaser.


<PAGE>

                                   EXHIBIT C-3

                            JOINT ESCROW INSTRUCTIONS

                                                        _________________, ____
Corporate Secretary
The Center for Adaptive Systems Applications, Inc.
1911 Central Avenue
Los Alamos, NM 87544-3023
Dear _________________:

         As Escrow Agent for both The Center for Adaptive Systems Applications,
Inc. (the "Company"), and the undersigned purchaser of stock of the Company (the
"Purchaser"), you are hereby authorized and directed to hold the documents
delivered to you pursuant to the terms of that certain Restricted Stock Purchase
Agreement (the "Agreement") between the Company and the undersigned, in
accordance with the following instructions:

         1. In the event the Company and/or any assignee of the Company
(referred to collectively for convenience herein as the "Company") exercises the
Company's repurchase option set forth in the Agreement, the Company shall give
to Purchaser and you a written notice specifying the number of shares of stock
to be purchased, the purchase price, and the time for a closing hereunder at the
principal office of the Company. Purchaser and the Company hereby irrevocably
authorize and direct you to close the transaction contemplated by such notice in
accordance with the terms of said notice.

         2. At the closing, you are directed (a) to date the stock assignments
necessary for the transfer in question, (b) to fill in the number of shares
being transferred, and (c) to deliver the stock assignments, together with the
certificate evidencing the shares of stock to be transferred, to the Company or
its assignee, against the simultaneous delivery to you of the purchase price (by
cash, a check, or some combination thereof) for the number of shares of stock
being purchased pursuant to the exercise of the Company's repurchase option.

         3. Purchaser irrevocably authorizes the Company to deposit with you any
certificates evidencing shares of stock to be held by you hereunder and any
additions and substitutions to said shares as defined in the Agreement.
Purchaser does hereby irrevocably constitute and appoint you as Purchaser's
attorney-in-fact and agent for the term of this escrow to execute with respect
to such securities all documents necessary or appropriate to make such
securities negotiable and to complete any transaction herein contemplated,
including but not limited to the filing with any applicable state blue sky
authority of any required applications for consent to, or notice of transfer of,
the securities. Subject to the provisions of this paragraph 3, Purchaser shall
exercise all rights and privileges of a stockholder of the Company while the
stock is held by you.

         4. Upon written request of the Purchaser, but no more than once per
calendar year, unless the Company's repurchase option has been exercised, you
will deliver to Purchaser a certificate or certificates representing so many
shares of stock as are not then subject to the Company's repurchase option.
Within 120 days after cessation of Purchaser's continuous employment by or
services to the Company, or any parent or subsidiary of the Company, you will
deliver to Purchaser a certificate or


<PAGE>

certificates representing the aggregate number of shares held or issued
pursuant to the Agreement and not purchased by the Company or its assignees
pursuant to exercise of the Company's repurchase option.

         5. If at the time of termination of this escrow you should have in your
possession any documents, securities, or other property belonging to Purchaser,
you shall deliver all of the same to Purchaser and shall be discharged of all
further obligations hereunder.

         6. Your duties hereunder may be altered, amended, modified or revoked
only by a writing signed by all of the parties hereto.

         7. You shall be obligated only for the performance of such duties as
are specifically set forth herein and may rely and shall be protected in relying
or refraining from acting on any instrument reasonably believed by you to be
genuine and to have been signed or presented by the proper party or parties. You
shall not be personally liable for any act you may do or omit to do hereunder as
Escrow Agent or as attorney-in-fact for Purchaser while acting in good faith,
and any act done or omitted by you pursuant to the advice of your own attorneys
shall be conclusive evidence of such good faith.

         8. You are hereby expressly authorized to disregard any and all
warnings given by any of the parties hereto or by any other person or
corporation, excepting only orders or process of courts of law and are hereby
expressly authorized to comply with and obey orders, judgments or decrees of any
court. In case you obey or comply with any such order, judgment or decree, you
shall not be liable to any of the parties hereto or to any other person, firm or
corporation by reason of such compliance, notwithstanding any such order,
judgment or decree being subsequently reversed, modified, annulled, set aside,
vacated or found to have been entered without jurisdiction.

         9. You shall not be liable in any respect on account of the identity,
authorities or rights of the parties executing or delivering or purporting to
execute or deliver the Agreement or any documents or papers deposited or called
for hereunder.

         10. You shall not be liable for the outlawing of any rights under the
Statute of Limitations with respect to these Joint Escrow Instructions or any
documents deposited with you.

         11. You shall be entitled to employ such legal counsel and other
experts as you may deem necessary properly to advise you in connection with your
obligations hereunder, may rely upon the advice of such counsel, and may pay
such counsel reasonable compensation therefor.

         12. Your responsibilities as Escrow Agent hereunder shall terminate if
you shall cease to be an officer or agent of the Company or if you shall resign
by written notice to each party. In the event of any such termination, the
Company shall appoint a successor Escrow Agent.

         13. If you reasonably require other or further instruments in
connection with these Joint Escrow Instructions or obligations in respect
hereto, the necessary parties hereto shall join in furnishing such instruments.


                                      -2-
<PAGE>

         14. It is understood and agreed that should any dispute arise with
respect to the delivery and/or ownership or right of possession of the
securities held by you hereunder, you are authorized and directed to retain in
your possession without liability to anyone all or any part of said securities
until such disputes shall have been settled either by mutual written agreement
of the parties concerned or by a final order, decree or judgment of a court of
competent jurisdiction after the time for appeal has expired and no appeal has
been perfected, but you shall be under no duty whatsoever to institute or defend
any such proceedings.

         15. Any notice required or permitted hereunder shall be given in
writing and shall be deemed effectively given upon personal delivery or upon
deposit in the United States Post Office, by registered or certified mail 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.

         16. By signing these Joint Escrow Instructions, you become a party
hereto only for the purpose of said Joint Escrow Instructions; you do not become
a party to the Agreement.

         17. This instrument shall be binding upon and inure to the benefit of
the parties hereto, and their respective successors and permitted assigns.


                                      -3-
<PAGE>

         18. These Joint Escrow Instructions shall be governed by the internal
substantive laws, but not the choice of law rules, of California.

PURCHASER                                    THE CENTER FOR ADAPTIVE SYSTEMS
                                             APPLICATIONS, INC.

--------------------------------------       -----------------------------------
Signature                                    By

--------------------------------------       -----------------------------------
Print Name                                   Title

--------------------------------------
--------------------------------------
Residence Address

ESCROW AGENT

--------------------------------------
Corporate Secretary
Dated: ________________________,_____


                                      -4-
<PAGE>

                                   EXHIBIT C-4

                                CONSENT OF SPOUSE

         I, ____________________, spouse of ___________________, have read and
approve the foregoing Restricted Stock Purchase Agreement (the "Agreement"). In
consideration of granting of the right to my spouse to purchase shares of
____________________________, as set forth in the Agreement, I hereby appoint my
spouse as my attorney-in-fact in respect to the exercise of any rights under the
Agreement and agree to be bound by the provisions of the Agreement insofar as I
may have any rights in said Agreement or any shares issued pursuant thereto
under the community property laws or similar laws relating to marital property
in effect in the state of our residence as of the date of the signing of the
foregoing Agreement.

Dated: ___________________,_____                Signature:

                                  EXHIBIT C-5

                          ELECTION UNDER SECTION 83(b)
                      OF THE INTERNAL REVENUE CODE OF 1986

The undersigned taxpayer hereby elects, pursuant to Sections 55 and 83(b) of the
Internal Revenue Code of 1986, as amended, to include in taxpayer's gross income
or alternative minimum taxable income, as the case may be, for the current
taxable year the amount of any compensation taxable to taxpayer in connection
with taxpayer's receipt of the property described below:

         1. The name, address, taxpayer identification number and taxable year
of the undersigned are as follows:

         NAME:                            TAXPAYER:               SPOUSE:
         ADDRESS:
         IDENTIFICATION NO.:              TAXPAYER:               SPOUSE:
         TAXABLE YEAR:

         2. The property with respect to which the election is made is described
as follows: __________ shares (the "Shares") of the Common Stock of The Center
for Adaptive Systems Applications, Inc. (the "Company").

         3. The date on which the property was transferred
is:___________________ ,______.

         4. The property is subject to the following restrictions:

         The Shares may not be transferred and are subject to forfeiture under
         the terms of an agreement between the taxpayer and the Company. These
         restrictions lapse upon the satisfaction of certain conditions
         contained in such agreement.

         5. The fair market value at the time of transfer, determined without
regard to any restriction other than a restriction which by its terms will never
lapse, of such property is: $_________________.

         6. The amount (if any) paid for such property is: $_________________.


<PAGE>

The undersigned has submitted a copy of this statement to the person for whom
the services were performed in connection with the undersigned's receipt of the
above-described property. The transferee of such property is the person
performing the services in connection with the transfer of said property.
THE UNDERSIGNED UNDERSTANDS THAT THE FOREGOING ELECTION MAY NOT BE REVOKED
EXCEPT WITH THE CONSENT OF THE COMMISSIONER.
Dated: ______________________, _____
      _________________________________________
                                  Taxpayer

The undersigned spouse of taxpayer joins in this election.
Dated: _____________________, ______
     _________________________________________
                               Spouse of Taxpayer