Document:

Exhibit 4.1

THE SECURITIES REPRESENTED BY THIS DOCUMENT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR THE SECURITIES LAWS OF ANY
STATE OR OTHER COUNTRY, AND MAY NOT BE OFFERED, SOLD TRANSFERRED, PLEDGED,
HYPOTHECATED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO (I) AN EFFECTIVE
REGISTRATION STATEMENT UNDER THE ACT AND ANY APPLICABLE STATE LAWS, (II) TO THE
EXTENT APPLICABLE, RULE 144 UNDER THE ACT (OR ANY SIMILAR RULE UNDER THE ACT
RELATING TO THE DISPOSITION OF SECURITIES), OR (III) AN OPINION OF COUNSEL, IF
SUCH OPINION SHALL BE REASONABLY SATISFACTORY TO COUNSEL TO THE ISSUER, THAT AN
EXEMPTION FROM REGISTRATION UNDER THE ACT AND APPLICABLE STATE LAW IS AVAILABLE.

                               RHOMBIC CORPORATION
                              CONVERTIBLE DEBENTURE

No. 1

Total Principal Amount: $2,500,000

February 20, 2001

FOR VALUE RECEIVED, the undersigned, RHOMBIC CORPORATION, a Nevada corporation
(the "Company"), hereby promises to pay to the order of Commodore Capital, Inc.
a financial organization located in Nevis West Indies or assigns (the "Holder"),
in lawful money of the United States of America, and in immediately payable
funds, the principal sum of two million five hundred thousand dollars
($2,500,000), with interest thereon, both before and after default until paid,
at the rate of ten percent (10%) per annum, upon the terms and conditions set
forth herein.

1. MATURITY DATE/INTEREST PAYMENTS. The Company shall pay to the Holder
quarterly interest payments in cash with the first payment due on May 1, 2001.
Upon conversion of this Debenture as allowed in this Agreement, all accumulated
but unpaid interest shall be extinguished. This Debenture shall mature and all
principal and accrued interest shall be fully due and payable by the Company to
Holder on April 17, 2002 (the "Maturity Date"). Interest shall be computed on
the actual days in a year and the actual number of days elapsed. Holder shall
fund this Debenture in incremental amounts of $100,000USD commencing May 5, 2001
with twenty five (25) equal payments every fifteen (15) days thereafter. The
first payment shall be in the amount of $200,000 USD $100,000 of which is hereby
acknowledged as received. The payments shall be on the dates specified in
Schedule A.

2. CONVERTIBILITY. This Debenture may be converted by the Holder at any time
beginning upon execution of this Debenture and ending upon the Maturity Date at
a conversion rate of one (1) share of Company Common Stock (the "Shares") per an
amount equal to 80% of the closing price of the common stock, as quoted on the
OTC BB, on the day the transmission of funds to the company is confirmed by the
Holder. The Holder, within its discretion, may not transmit an incremental
payment if the closing common stock price, as quoted on the OTC BB, falls below
$0.15 per share. No accrued interest will be paid upon conversion. The Shares to
<PAGE>
be issued upon conversion shall not be subject to any liens, security interests,
pledges, encumbrances, charges, restrictions, demands or claims of any other
party whatsoever. Company shall use its best efforts to expeditiously file with
and have declared effective by the Securities and Exchange Commission a
registration statement in an appropriate form to register the Shares issuable
upon conversion of this Debenture to ensure that Company will have freely
tradable stock available to Holder in the event Holder elects to convert this
Debenture to Shares.

3. PREPAYMENT. The Company may prepay this Debenture prior to the Maturity Date
and prior to the receipt of a conversion election, in whole or in part, at any
time.

4. TRANSFERABILITY. This Debenture shall be freely transferable and assignable
by the Holder provided such transfer or assignment is in compliance with
applicable federal and state securities laws.

5. TERMINATION. Holder may terminate funding this Debenture immediately upon the
occurrence of any of the following events:

a. Bankruptcy or insolvency of the Company;

b. Serious violations (SEC, Reporting, or other) that would adversely affect the
Company's publicly traded stock; or

A prohibition against selling Company product(s) in the United States.

6. DEFAULT. In the event of the Company's failure to pay the principal and
interest due hereunder within ten (10) days following the Maturity Date, Holder
shall have the option, by written notice to the Company, to declare the unpaid
principal amount due to Holder, together with all accrued interest thereon,
immediately due and payable. In the event Company fails to cure the default
within twenty (20) days of the date of receipt of the written notice by Holder,
Holder may pursue any legal remedy available to Holder.

7. NOTICES. Notices to be given hereunder shall be in writing and shall be
deemed to have been sufficiently given if delivered personally or sent by
overnight courier or messenger or sent by registered or certified mail (air mail
if overseas), return receipt requested, or by telex, facsimile transmission,
telegram or similar means of communication. Notice shall be deemed to have been
received on the date of personal delivery, telex, facsimile transmission,
telegram or similar means of communication, or if sent by overnight courier or
messenger, shall be deemed to have been received on the next delivery day after
deposit with the courier or messenger, or if sent by certified or registered
mail, return receipt requested, shall be deemed to have been received on the
fifth business day after the date of mailing. The Parties shall give written
notice of any change of address to each other.

                                       2
<PAGE>
8. INVESTOR STATUS. By providing the principal amount(s) set forth in this
Debenture, Holder acknowledges and certifies that this Debenture represents a
highly speculative investment and that Holder's personal financial situation is
such that (i) Holder can afford to hold the Debenture for an indefinite period
of time and to sustain a complete loss of this investment, and (ii) Holder has
adequate means of providing for Holder's current needs and possible
contingencies and has no need for liquidity in this investment in the Company.
By virtue of Holder's knowledge and experience in financial and business
matters, Holder is capable of evaluating the merits and risks of an investment
in the securities.

Holder, if a corporation, partnership, trust or other form of business entity,
(i) is authorized and otherwise duly qualified to purchase and hold the
Debenture, (ii) has obtained such additional tax and other advice that it has
deemed necessary, and (iii) has not been formed for the specific purpose of
acquiring the Debenture.

Holder consents to the affixing by the Company of such legends on certificates
representing the securities as any applicable federal or state securities law
may require from time to time. Holder further acknowledges and certifies that in
evaluating the suitability of an investment in the Company, Holder has relied on
Holder's own independent investigations and has not relied upon any
representations or other information (whether oral or written) from the Company,
and its officers, directors, agents, employees or representatives. Holder
acknowledges that in making the decision to invest in the Company, Holder has,
prior to any purchase of the securities, been given the information on the
Company, its business, and its financials, had access and opportunity to examine
this offer, and had an opportunity to ask questions of, and to receive answers
from, the Company or any person acting on its behalf concerning the terms and
conditions of this offering. Holder has been furnished with access to all
publicly available materials relating to the business, finances, and operations
of the Company and material relating to the offer and sale of the securities
which have been requested. Holder has received complete and satisfactory answers
to any such inquiries. Holder acknowledges that Holder has not received any
formal disclosure document regarding this investment, and Holder is an
accredited investor as defined in Rule 501 of Regulation D of the Securities Act
of 1933, as amended.

9. GOVERNING LAW. This Debenture shall be governed by and construed and
interpreted in accordance with the laws of the state of Nevada applicable to
contracts made and to be performed entirely therein, without giving effect to
the rules and conflicts of law.

10. ATTORNEYS FEES. In the event of default by the Company requiring the Holder
or any assignee thereof to refer this Debenture to an attorney for collection,
the Company agrees to pay all reasonable costs and expenses incurred in
attempting or effecting collection hereunder, including reasonable attorney's
fees, whether or not suit is instituted.

11. MODIFICATION. This Debenture may be modified or amended only by an agreement
in writing signed by the party against whom the agreement is sought to be
enforced.

                                       3
<PAGE>
12. CONFORMITY WITH LAW. All agreements between the Company and Holder are
expressly limited, so that in no event or contingency whatsoever, whether by
reason of the advancement of the proceeds of this Debenture, acceleration of
maturity of the unpaid principal balance, or otherwise, shall the amount paid or
agreed to be paid to Holder of this Debenture for the use, forbearance, or
detention of the money to be advanced under this Debenture exceed the highest
lawful rate permissible under applicable usury laws. If, under any circumstances
whatsoever, fulfillment of any provision of this Debenture or any other
agreement pertaining hereto, after timely performance of such provision is due,
shall involve transcending the limit of validity prescribed by law which a court
of competent jurisdiction deems applicable, then, ipso facto, the obligations to
be fulfilled shall be reduced to the limit of such validity, and if, under any
circumstances whatsoever, Holder shall ever receive as interest an amount that
exceeds the highest lawful rate, the amount that would be excessive interest
shall be applied to the reduction of the unpaid principal balance under this
Debenture and not to the payment of interest, or, if such excessive interest
exceeds the unpaid balance of principal under this Debenture, such excess shall
be refunded to Company. This provision shall control every other provision of
all agreements between Company and Holder.

IN WITNESS WHEREOF, the Company and Holder have executed this Debenture as of
March 7, 2001.

The Company

RHOMBIC CORPORATION
a Nevada corporation

/s/ Roger Duffield
-------------------------------------
BY:  Roger Duffield
ITS: President

The Holder

COMMODORE CAPITAL, INC.

BY: Its Director, FN Management, Ltd.
-------------------------------------

                                       4
<PAGE>
SCHEDULE A

                      Date Due/
Payment Amount      Date Received       New Total Principal       Initial by Co.
--------------      -------------       -------------------       --------------
$
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$
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$
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$
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$
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$
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$
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$
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$
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$
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$
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$
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$
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$
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$
------------      --------/--------         -----------             -----------<PAGE>   1

                                                                    EXHIBIT 4.1

                                   BARRA, INC.

                       1996 EMPLOYEE STOCK PURCHASE PLAN*

--------

*        As amended by Amendment Number One To The BARRA, Inc. 1996 Employee
         Stock Purchase Plan, effective as of August 1, 1996, and by Amendment
         Number Two to The BARRA, Inc. 1996 Employee Stock Purchase Plan,
         effective as of August 27, 1997.

<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----

<S>                                                                       <C>
I.       PURPOSE.............................................................1

2.       DEFINITIONS.........................................................1

3.       ELIGIBILITY.........................................................2

4.       PARTICIPATION.......................................................3

5.       OFFERING............................................................4

6.       PURCHASE OF STOCK...................................................5

7.       PAYMENT AND DELIVERY................................................5

8.       RECAPITULATION......................................................5

9.       MERGER, LIQUIDATION, OTHER CORPORATION TRANSACTIONS.................6

10.      TRANSFERABILITY.....................................................6

11.      AMENDMENT OR TERMINATION OF THE PLAN................................6

12.      ADMINISTRATION......................................................7

13.      COMMITTEE RULES FOR FOREIGN JURISDICTIONS...........................7

14.      SECURITIES LAWS REQUIREMENTS........................................7

15.      GOVERNMENT REGULATIONS..............................................7

16.      NO ENLARGEMENT OF EMPLOYEE RIGHTS...................................7

17.      GOVERNING LAW.......................................................8

18.      EFFECTIVE DATE......................................................8

</TABLE>

                                      -i-

<PAGE>   3

                                   BARRA, INC.

                       1996 EMPLOYEE STOCK PURCHASE PLAN*

1.       PURPOSE.

         The purpose of this Plan is to provide an opportunity for Employees of
BARRA, Inc. (the "Corporation") and its Designated Subsidiaries, to purchase
Common Stock of the Corporation and thereby to have an additional incentive to
contribute to the prosperity of the Corporation. It is the intention of the
Corporation that the Plan qualify as an "Employee Stock Purchase Plan" under
Section 423 of the Internal Revenue Code of 1986, as amended, and the Plan shall
be construed in accordance with this intention.

2.       DEFINITIONS.

         (a) "BOARD" shall mean the Board of Directors of the Corporation.

         (b) "CODE" shall mean the Internal Revenue Code of 1986, as amended.

         (c) "COMMITTEE" shall mean the committee appointed by the Board in
accordance with Section 12 of the Plan.

         (d) "COMMON STOCK" shall mean the Common Stock of the Corporation, or
any stock into which such Common Stock may be converted.

         (e) "COMPENSATION" shall mean an Employee's wages or salary and other
amounts payable to an Employee on account of personal services rendered by the
Employee to the Corporation or a Designated Subsidiary and which are reportable
as wages or other compensation on the Employee's Form W-2, plus pre-tax
contributions of the Employee under a cash or deferred arrangement (401(k) plan)
or cafeteria plan maintained by the Corporation or a Designated Subsidiary, but
excluding, however, (1) non-cash fringe benefits, (2) special payments as
determined by the Committee (e.g., moving expenses, unused vacation, severance
pay), (3) income from the exercise of stock options or other stock purchases and
(4) any other items of Compensation as determined by the Committee.

         (f) "CORPORATION" shall mean BARRA, Inc., a California corporation.

         (g) "DESIGNATED SUBSIDIARY" shall mean a Subsidiary which has been
designated by the Board as eligible to participate in the Plan.

--------

* As amended by Amendment Number One To The BARRA, Inc. 1996 Employee
      Stock Purchase Plan, effective as of August 1, 1996, and by Amendment
      Number Two to The BARRA, Inc. 1996 Employee Stock Purchase Plan,
      effective as of August 27, 1997.

<PAGE>   4

         (h) "EMPLOYEE" shall mean an individual employed (within the meaning of
Code Section 3401(c) and the regulations thereunder) by the Corporation or a
Designated Subsidiary.

         (i) "ENTRY DATE" shall mean the first day of each Option Period.

         (j) "EXERCISE DATE" shall mean the last business day of each
Exercise Period.

         (k) "EXERCISE PERIOD" shall mean a three-month, six-month or other
period as determined by the Board. The first Exercise Period during an Option
Period shall commence on the first day of such Option Period. Subsequent
Exercise Periods, if any, shall run consecutively after the termination of the
preceding Exercise Period. The last Exercise Period in an Option Period shall
terminate on the last day of such Option Period.

         (l) "FAIR MARKET VALUE" shall mean the value of one (1) share of Common
Stock on the relevant date, determined as follows:

             (1) If the shares are traded on an exchange, the reported "closing
price" on the next preceding trading day;

             (2) If the shares are traded over-the-counter on the NASDAQ System
or on the NASDAQ National Market System, the closing price of the Common Stock
on said System on the preceding trading day in U.S. dollars; and

             (3) If neither (1) nor (2) applies, the fair market value as
determined by the Committee in good faith. Such determination shall be
conclusive and binding on all persons.

         (m) "OPTION PERIOD" shall mean a period of up to twenty-seven (27)
months as determined by the Committee. The Board may determine that the Option
Period and the Exercise Period are the same.

         (n) "PARTICIPANT" shall mean a participant in the Plan as described in
Section 4 of the Plan.

         (o) "PLAN" shall mean this employee stock purchase plan.

         (p) "SHAREHOLDER" shall mean a record holder of shares entitled to vote
shares of Common Stock under the Corporation's by-laws.

         (q) "SUBSIDIARY" shall mean any corporation (other than the
Corporation) in an unbroken chain of corporations beginning with the
Corporation, as described in Code Section 424(f).

<PAGE>   5

3.       ELIGIBILITY.

         Any Employee regularly employed on a full-time basis by the Corporation
or by any Designated Subsidiary on an Entry Date shall be eligible to
participate in the Plan with respect to the Option Period commencing on such
Entry Date, provided that the Committee may establish administrative rules
requiring that employment commence some minimum period (e.g., one pay period)
prior to an Entry Date to be eligible to participate with respect to that Entry
Date and provided further that (1) the Board may extend eligibility to part-time
Employees pursuant to criteria and procedures established by the Committee and
(2) the Board may impose an eligibility period on participation of up to two
years with respect to participation on any prospective Entry Date. The Board may
also determine that a designated group of highly compensated Employees (e.g.,
Employees subject to Rule 16b-3 promulgated under the Securities Exchange Act of
1934) are ineligible to participate in the Plan. An Employee shall be considered
employed on a full-time basis unless his or her customary employment is less
than 20 hours per week or five months per year. No Employee may participate in
the Plan if immediately after an option is granted the Employee owns or is
considered to own (within the meaning of Code Section 424(d)), shares of stock,
including stock which the Employee may purchase by conversion of convertible
securities or under outstanding options granted by the Corporation, possessing
five percent (5%) or more of the total combined voting power or value of all
classes of stock of the Corporation or of any of its Subsidiaries. All Employees
who participate in the Plan shall have the same rights and privileges under the
Plan except for differences which may be mandated by local law and which are
consistent with Code Section 423(b)(5). The Board may impose restrictions on
eligibility and participation of Employees who are officers and directors to
facilitate compliance with federal or state securities laws or foreign laws.

4.       PARTICIPATION.

         4.1 An Employee who is eligible to participate in the Plan in
accordance with Section 3 may become a Participant by filing, on a date
prescribed by the Committee prior to an applicable Entry Date, a completed
payroll deduction authorization and Plan enrollment form provided by the
Corporation. An eligible Employee may authorize payroll deductions at the rate
of any whole percentage of the Employee's Compensation, not to exceed fifteen
percent (15%) of the Employee's Compensation, or such lesser percentage as
specified by the Committee as applied to an Entry Date or Option Period. All
payroll deductions may be held by the Corporation and commingled with its other
corporate funds. No interest shall be paid or credited to the Participant with
respect to such payroll deductions except where required by local law as
determined by the Committee. A separate bookkeeping account for each Participant
shall be maintained by the Corporation under the Plan and the amount of each
Participant's payroll deductions shall be credited to such account. A
Participant may not make any additional payments into such account.

         4.2 Under procedures established by the Committee, a Participant may
suspend or discontinue participation in the Plan at any time during an Exercise
Period by completing and filing a new payroll deduction authorization and Plan
enrollment form with the Corporation. A

<PAGE>   6

Participant may increase or decrease his or her rate of payroll deductions only
effective on an Entry Date by filing a new payroll deduction authorization and
Plan enrollment form. If a new payroll deduction authorization and Plan
enrollment form is not filed with the Corporation, the rate of payroll
deductions shall continue at the originally elected rate throughout the Option
Period unless the Board determines to change the permissible rate.

         If a Participant suspends participation during an Exercise Period, his
or her accumulated payroll deductions will remain in the Plan for purchase of
shares as specified in Section 6 on the following Exercise Date, but the
Participant will not again participate until he or she completes a new payroll
deduction authorization and Plan enrollment form. The Committee may establish
rules limiting the frequency with which Participants may suspend and resume
payroll deductions under the Plan and may impose a waiting period on
Participants wishing to resume suspended payroll deductions. If a Participant
discontinues participation in the Plan, the amount credited to the Participant's
individual account shall be paid to the Participant without interest (except
where required by local law). In the event any Participant terminates employment
with the Corporation or any Subsidiary for any reason (including death) prior to
the expiration of an Option Period, the Participant's participation in the Plan
shall terminate and all amounts credited to the Participant's account shall be
paid to the Participant or the Participant's estate without interest (except
where required by local law). Whether a termination of employment has occurred
shall be determined by the Committee. The Committee may also establish rules
regarding when leaves of absence or change of employment status (e.g., from
full-time to part-time) will be considered to be a termination of employment,
and the Committee may establish termination of employment procedures for this
Plan which are independent of similar rules established under other benefit
plans of the Corporation and its Subsidiaries.

         In the event of a Participant's death, any accumulated payroll
deductions will be paid, without interest, to the estate of the Participant.

5.       OFFERING.

         5.1 The maximum number of shares of Common Stock which may be issued
pursuant to the Plan shall be 1,125,000 shares. The Board may designate any
amount of available shares for offering for any Option Period determined
pursuant to Section 5.2.

         5.2 Each Option Period, Entry Date and Exercise Period shall be
determined by the Board. The Board shall have the power to change the duration
of future Option Periods or future Exercise Periods, and to determine whether or
not to have overlapping Option Periods, with respect to any prospective
offering, without shareholder approval, and without regard to the expectations
of any Participants.

         5.3 With respect to each Option Period, each eligible Employee who has
elected to participate as provided in Section 4.1 shall be granted an option to
purchase that number of shares of Common Stock which may be purchased with the
payroll deductions accumulated on behalf of such Employee (assuming payroll
deductions at a rate of 15% of Compensation) during each Exercise Period within
such Option Period at the purchase price specified in

<PAGE>   7

Section 5.4 below; provided, however, (1) in no event shall the Employee be
entitled to accrue rights to purchase shares under the Plan (and all other
employee stock purchase plans, as defined in Code Section 423, of the
Corporation and its subsidiaries) at a rate which exceeds $25,000 of the Fair
Market Value of such stock (determined at the time the option is granted) for
any calendar year in which such option is outstanding at any time, and (2) the
maximum shares subject to any option shall in no event exceed 500.

         5.4 The option price under each option shall be the lower of: (i) a
percentage (not less than eighty-five percent (85%)) established by the Board
("Designated Percentage") of the Fair Market Value of the Common Stock on the
Entry Date on which an option is granted, or (ii) the Designated Percentage of
the Fair Market Value on the Exercise Date on which the Common Stock is
purchased. The Board may change the Designated Percentage with respect to any
future Option Period, but not below eighty-five percent (85%).

         5.5 If the total number of shares of Common Stock for which options
granted under the Plan are exercisable exceeds the maximum number of shares
offered on any Entry Date, the number of shares which may be purchased under
options granted on the Entry Date shall be reduced on a pro rata basis in as
nearly a uniform manner as shall be practicable and equitable. In this event,
payroll deductions shall also be reduced or refunded accordingly.

         5.6 In the event that the Fair Market Value of the Corporation's Common
Stock is lower on the first day of an Exercise Period within an Option Period
(subsequent "Reassessment Date") than it was on the Entry Date for such Option
Period, all Employees participating in the Plan on the Reassessment Date shall
be deemed to have relinquished the unexercised portion of the option granted on
the Entry Date and to have enrolled in and received a new option commencing on
such Reassessment Date, unless the Board has determined not to permit
overlapping Option Periods or to restrict such transfers to lower price Option
Periods.

6.       PURCHASE OF STOCK.

         Upon the expiration of each Exercise Period, a Participant's option
shall be exercised automatically for the purchase of whole shares of Common
Stock which the accumulated payroll deductions credited to the Participant's
account at that time shall purchase at the applicable price specified in Section
5.4. Any amount not applied to the purchase of common stock by reason of the
limit on the maximum number of purchasable shares or by reason that such amount
would be insufficient to purchase an additional whole share will be refunded to
the participant.

7.       PAYMENT AND DELIVERY.

         Upon the exercise of an option, the Corporation shall deliver to the
Participant the whole and fractional shares of Common Stock purchased on the
Participant's behalf. The Board may permit or require that shares be deposited
directly with a broker designated by the Participant (or a broker selected by
the Committee) or to a designated agent of the Company, and the Committee may
utilize electronic or automated methods of share transfer. The Board

<PAGE>   8

may require that shares be retained with such broker or agent for a designated
period of time (and may restrict dispositions during that period) and/or may
establish other procedures to permit tracking of disqualifying dispositions of
such shares and/or to restrict transfer of such shares. The Corporation shall
retain the amount of payroll deductions used to purchase Common Stock as full
payment for the Common Stock and the Common Stock shall then be fully paid and
non-assessable. No Participant shall have any voting, dividend, or other
stockholder rights with respect to shares subject to any option granted under
the Plan until the option has been exercised and shares issued.

8.       RECAPITALIZATION.

         If after the grant of an option, but prior to the purchase of Common
Stock under the option, there is any increase or decrease in the number of
outstanding shares of Common Stock because of a stock split, stock dividend,
combination or recapitalization of shares subject to options, the number of
shares to be purchased pursuant to an option, the share limit of Section 5.3 and
the maximum number of shares specified in Section 5.1 shall be proportionately
increased or decreased, the terms relating to the purchase price with respect to
the option shall be appropriately adjusted by the Board, and the Board shall
take any further actions which, in the exercise of its discretion, may be
necessary or appropriate under the circumstances.

         The Board, if it so determines in the exercise of its sole discretion,
also may adjust the number of shares specified in Section 5.1, as well as the
price per share of Common Stock covered by each outstanding option and the
maximum number of shares subject to any individual option, in the event the
Corporation effects one or more reorganizations, recapitalizations, spin-offs,
split-ups, rights offerings or reductions of shares of its outstanding Common
Stock.

         The Board's determinations under this Section 8 shall be conclusive and
binding on all parties.

9.       MERGER, LIQUIDATION, OTHER CORPORATION TRANSACTIONS.

         In the event of the proposed liquidation or dissolution of the
Corporation, the Option Period will terminate immediately prior to the
consummation of such proposed transaction, unless otherwise provided by the
Board in its sole discretion, and all outstanding options shall automatically
terminate and the amounts of all payroll deductions will be refunded without
interest to the Participants.

         In the event of a proposed sale of all or substantially all of the
assets of the Corporation, or the merger or consolidation of the Corporation
with or into another corporation, then in the sole discretion of the Board, (1)
each option shall be assumed or an equivalent option shall be substituted by the
successor corporation or parent or subsidiary of such successor corporation, (2)
a date established by the Board on or before the date of consummation of such
merger, consolidation or sale shall be treated as an Exercise Date, and all
outstanding options shall be

<PAGE>   9

deemed exercisable on such date or (3) all outstanding options shall terminate
and the accumulated payroll deductions shall be returned to the Participants.

10.      TRANSFERABILITY.

         Options granted to Participants may not be voluntarily or involuntarily
assigned, transferred, pledged, or otherwise disposed of in any way, and any
attempted assignment, transfer, pledge, or other disposition shall be null and
void and without effect. If a Participant in any manner attempts to transfer,
assign or otherwise encumber his or her rights or interest under the Plan, other
than as permitted by the Code, such act shall be treated as an election by the
participant to discontinue participation in the Plan pursuant to Section 4.2.

11.      AMENDMENT OR TERMINATION OF THE PLAN.

         11.1 The Plan shall continue until May 16, 2006, unless previously
terminated in accordance with Section 11.2.

         11.2 The Board may, in its sole discretion, insofar as permitted by
law, terminate or suspend the Plan, or revise or amend it in any respect
whatsoever, except that, without approval of the shareholders, no such revision
or amendment shall:

             (a) materially increase the number of shares subject to the Plan,
other than an adjustment under Section 8 of the Plan;

             (b) materially modify the requirements as to eligibility for
participation in the Plan, except as otherwise specified in this Plan;

             (c) materially increase the benefits accruing to Participants;

             (d) reduce the purchase price specified in Section 5.4, except as
specified in Section 8;

             (e) extend the term of the Plan beyond the date specified in
Section 11.1; or

             (f) amend this Section 11.2 to defeat its purpose.

12.      ADMINISTRATION.

         The Board shall appoint a Committee consisting of at least two members
who will serve for such period of time as the Board may specify and who may be
removed by the Board at any time. The Committee will have the authority and
responsibility for the day-to-day administration of the Plan, the authority and
responsibility specifically provided in this Plan and any additional duties,
responsibility and authority delegated to the Committee by the Board, which may
include any of the functions assigned to the Board in this Plan. The Committee
shall have full power and authority to promulgate any rules and regulations
which it deems

<PAGE>   10

necessary for the proper administration of the Plan, to interpret the provisions
and supervise the administration of the Plan, and to take all action in
connection with administration of the Plan as it deems necessary or advisable,
consistent with the delegation from the Board. Decisions of the Board and the
Committee shall be final and binding upon all participants. Any decision reduced
to writing and signed by a majority of the members of the Committee shall be
fully effective as if it had been made at a meeting of the Committee duly held.
The Corporation shall pay all expenses incurred in the administration of the
Plan. No Board or Committee member shall be liable for any action or
determination made in good faith with respect to the Plan or any option granted
thereunder.

13.      COMMITTEE RULES FOR FOREIGN JURISDICTIONS.

         The Committee may adopt rules or procedures relating to the operation
and administration of the Plan in non-United States jurisdictions to accommodate
the specific requirements of local laws and procedures. Without limiting the
generality of the foregoing, the Committee is specifically authorized to adopt
rules and procedures regarding handling of payroll deductions, payment of
interest, conversion of local currency, withholding procedures and handling of
stock certificates which vary with local requirements.

14.      SECURITIES LAWS REQUIREMENTS.

         The Corporation shall not be under any obligation to issue Common Stock
upon the exercise of any option unless and until the Corporation has determined
that: (i) it and the Participant have taken all actions required to register the
Common Stock under the Securities Act of 1933, or to perfect an exemption from
the registration requirements thereof; (ii) any applicable listing requirement
of any stock exchange on which the Common Stock is listed has been satisfied;
and (iii) all other applicable provisions of state, federal and applicable
foreign law have been satisfied.

15.      GOVERNMENTAL REGULATIONS.

         This Plan and the Corporation's obligation to sell and deliver shares
of its stock under the Plan shall be subject to the approval of any governmental
authority required in connection with the Plan or the authorization, issuance,
sale, or delivery of stock hereunder.

16.      NO ENLARGEMENT OF EMPLOYEE RIGHTS.

         Nothing contained in this Plan shall be deemed to give any Employee the
right to be retained in the employ of the Corporation or any Designated
Subsidiary or to interfere with the right of the Corporation or Designated
Subsidiary to discharge any Employee at any time.

<PAGE>   11

17.      GOVERNING LAW.

         This Plan shall be governed by California law, but shall be interpreted
to be consistent with the requirements of any employee stock purchase plan under
Code Section 423.

18.      EFFECTIVE DATE.

         This Plan shall be effective May 16, 1996, subject to approval of the
shareholders of the Corporation within 12 months of its adoption by the Board of
Directors.

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