Document:

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                                                                    EXHIBIT 4.3

THIS WARRANT AND THE SHARES ISSUABLE HEREUNDER HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR
OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT
OR PURSUANT TO RULE 144 OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE
CORPORATION AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.

                             WARRANT TO PURCHASE STOCK

Corporation:                 Endgate Corporation, a Delaware corporation
Number of Shares:            See below
Class of Stock:              See below
Initial Exercise Price:      See below
Issue Date:                  March 16, 1998
Expiration Date:             March 15, 2003

     THIS WARRANT CERTIFIES THAT, for the agreed upon value of $1.00 and for
other good and valuable consideration, SILICON VALLEY BANK ("Holder") is
entitled to purchase the number of fully paid and nonassessable shares of the
class of securities (the "Shares") of the corporation (the "Company") at the
initial exercise price per Share (the "Warrant Price") all as set forth herein
and as adjusted pursuant to Article 2 of this Warrant, subject to the provisions
upon the terms and conditions set forth of this Warrant The Warrant Price shall
be equal to the price per share at which the Company after the date hereof first
sells its shares of capital stock in an offering in which the Company receives
not less than Ten Million Dollars ($10,000,000) including cancellation of
indebtedness and exercise of warrants (net or cash) (the "Equity Event") and the
Shares subject to this Warrant shall be the class of securities sold in the
Equity Event provided that if the Obligations under that certain Bridge Loan and
Security Agreement between Company and Holder (the "Loan Agreement") are not
repaid in full by April 30, 1998, then, at Holder's option (elected as of
Holder's first exercise of rights hereunder), the Warrant Price shall be equal
to $3.00 per share and the type of security subject to this Warrant shall be
Series C Preferred. The number of Shares subject to the Warrant shall initially
be the quotient derived by dividing Fifteen Thousand Dollars ($15,000) by the
Warrant Price. On the date that the Company requests a Bridge Advance under the
Loan Agreement the Warrant sha11 initially be for an additional number of Shares
equal to the quotient derived by dividing Twenty Two Thousand Five Hundred
Dollars ($22,500) by the Warrant Price. On the date that the Company requests a
Bridge Advance that causes the outstanding balance under the Loan Agreement to
exceed $750,000, this Warrant shall initially be for an additional number of
Shares equal to the quotient derived by dividing Thirty Seven Thousand Five
Hundred Dollars ($37,500) by the Warrant Price.

ARTICLE 1.   EXERCISE.

     1.1 METHOD OF EXERCISE. Holder may exercise this Warrant by delivering a
duly executed Notice of Exercise in substantially the form attached as Appendix
1 to the principal office of the Company, Unless Holder is exercising the
conversion right set forth in Section 1.2, Holder shall also deliver to the
Company a check for the aggregate Warrant Price for the Shares being purchased.

     1.2 CONVERSION RIGHT. In lieu of exercising this Warrant as specified in
Section 1.1, Holder may from time to time convert this Warrant, in whole or in
part, into a number of Shares

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determined by dividing (a) the aggregate fair market value of the Shares or
other securities otherwise issuable upon exercise of this Warrant minus the
aggregate Warrant Price of such Shares by (b) the fair market value of one
Share. The fair market value of the Shares shall be determined pursuant Section
1.4.

     1.3 NO RIGHTS AS SHAREHOLDER. This Warrant does not entitle Holder to any
voting rights as a shareholder of the Company prior to the exercise hereof.

     1.4 FAIR MARKET VALUE. If the Shares are traded in a public market, the
fair market value of the Shares shall be the closing price of the Shares (or the
closing price of the Company's stock into which the Shares are convertible)
reported for the business day immediately before Holder delivers its Notice of
Exercise to the Company. If the Shares are not traded in a public market, the
Board of Directors of the Company shall determine fair market value in its
reasonable good faith judgment.

     1.5 DELIVERY OF CERTIFICATE AND NEW WARRANT. Promptly after Holder
exercises or converts this Warrant, the Company shall deliver to Holder
certificates for the Shares acquired and, if this Warrant has not been fully
exercised or converted and has not expired, a new Warrant representing the
Shares not so acquired.

     1.6 REPLACEMENT OF WARRANTS. On receipt of evidence reasonably satisfactory
to the Company of the loss, theft, destruction or mutilation of this Warrant
and, in the case of loss, theft or destruction, on delivery of an indemnity
agreement reasonably satisfactory in form and amount to the Company and its
legal counsel or, in the case of mutilation, or surrender and cancellation of
this Warrant, the Company shall execute and deliver, in lieu of this Warrant, a
new warrant of like tenor.

     1.7 REPURCHASE ON SALE, MERGER, OR CONSOLIDATION OF THE COMPANY.

          1.7.1 "ACQUISITION". For the purpose of this Warrant, "Acquisition"
means any sale, license, or other disposition of all or substantially all of the
assets of the Company, or any reorganization, consolidation, or merger of the
Company in which the holders of the Company's securities before the transaction
beneficially own less than 50% of the outstanding voting securities of the
surviving entity after the transaction.

          1.7.2 ASSUMPTION OF WARRANT. Upon the closing of any Acquisition the
successor entity shall assume the obligations of this Warrant, and this Warrant
shall be exercisable for the same securities, cash, and property a would be
payable for the Shares issuable upon exercise of the unexercised portion of this
Warrant as if such Shares were outstanding on the record date for the
Acquisition and subsequent closing. The Warrant Price shall be adjusted
accordingly. Notwithstanding the foregoing, if the successor entity does not
assume the obligations of the Warrant, the Company and such successor shall pay
Holder in cash an amount equal to three (3.) times the Warrant Price per share,
not later thin the closing of such Acquisition. In exchange for such payment,
this Warrant shall be canceled as of the date of the Acquisition.

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          1.7.3 PUBLIC OFFERING. For purposes of this Warrant, a "Public
Offering" means the sale of the Company's Common Stock pursuant to a
registration statement under the Securities Act of 1933, as amended, for an
underwritten public offering (other than a registration on Form S-8, Form S-4 or
comparable forms), which results in aggregate cash proceeds (prior to
underwriters' commissions and expenses) to the Company of more than $7,500,000.
Immediately prior to the closing of any Public Offering prior to the Expiration
Date, any portion of this Warrant then not exercised or exercisable will be
exercisable for the number of shares of the Company's Common Stock that would
have resulted from the conversion, pursuant to the Company's Articles of
Incorporation then in effect in the amount of the maximum number of shares of
Preferred Stock that could have been acquired by the Holder upon the exercise of
the unexpired portion of this Warrant immediately prior to such Public Offering.

ARTICLE 2      ADJUSTMENT TO THE SHARES.

     2.1 STOCK DIVIDENDS, SPLITS, ETC. If the Company declares or pays a
dividend on its common stock (or the Shares if the Shares are securities other
than common stock) payable in common stock, or other securities, subdivides the
outstanding common stock into a greater amount of common stock, or, if the
Shares are securities other than common stock, subdivides the Shares in a
transaction that increases the amount of common stock into which the Shares are
convertible, then upon exercise of this Warrant, for each Share acquired, Holder
shall receive, without cost to Holder, the total number and kind of securities
to which Holder would have been entitled had Holder owned the Shares of record
as of the date the dividend or subdivision occurred.

     2.2 RECLASSIFICATION, EXCHANGE OR SUBSTITUTION. Upon any reclassification,
exchange, substitution, or other event that results in a change of the number
and/or class of the securities issuable upon exercise or conversion of this
Warrant, Holder shall be entitled to receive, upon exercise or conversion of
this Warrant, the number and kind of securities and property that Holder would
have received for the Shares if this Warrant had been exercised immediately
before such reclassification, exchange, substitution, or other event. Such an
event shall include any automatic conversion of the outstanding or issuable
securities of the Company of the same class or series as the Shares to common
stock pursuant to the terms of the Company's Articles of Incorporation upon the
closing of a registered public offering of the Company's common stock. The
Company or its successor shall promptly issue to Holder a new Warrant for such
new securities or other property. The new Warrant shall provide for adjustments
which shall be as nearly equivalent as may be practicable to the adjustments
provided for in this Article 2 including without limitation, adjustments to the
Warrant Price and to the number of securities or property issuable upon exercise
of the new Warrant. The provisions of this Section 2.2 shall similarly apply to
successive reclassifications, exchanges, substitutions, or other events.

     2.3 ADJUSTMENTS FOR COMBINATIONS. ETC. If the outstanding Shares are
combined or consolidated, by reclassification or otherwise, into a lesser number
of shares, the Warrant Price shall be proportionately increased.

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     2.4 ADJUSTMENTS FOR DILUTING ISSUANCES. The number of shares of common
stock issuable upon conversion of the Shares, shall be subject to adjustment,
from time to time in the manner set forth on Exhibit A in the event of Diluting
Issuances (as defined on Exhibit A).

     2.5 NO IMPAIRMENT. The Company shall not, by amendment of its Articles of
Incorporation or through a reorganization, transfer of assets, consolidation,
merger, dissolution, issue, or sale of securities or any other voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed under this Warrant by the Company, but shall at all times
in good faith assist in carrying out of all the provisions of this Article 2 and
in taking all such action as may be necessary or appropriate to protect Holder's
rights under this Article 2 against impairment.

     2.6 FRACTIONAL SHARES. No fractional Shares shall be issuable upon exercise
or conversion of the Warrant and the number of Shares to be issued shall be
rounded down to the nearest whole Share. If a fractional share interest arises
upon any exercise or conversion of the Warrant, the Company shall eliminate such
fractional share interest by paying Holder amount computed by multiplying the
fractional interest by the fair market value of a full Share.

     2.7 CERTIFICATE AS TO ADJUSTMENTS. Upon each adjustment of the Warrant
Price, the Company shall promptly compute such adjustment, and furnish Holder
with a certificate of its Chief Financial Officer setting forth such adjustment
and the facts upon which such adjustment is based. The Company shall, upon
written request with reasonable notice, furnish Holder a certificate setting
forth the Warrant Price in effect upon the date thereof and the series of
adjustments leading to such Warrant Price.

ARTICLE 3.     REPRESENTATIONS AND COVENANTS OF THE COMPANY.

     3.1 REPRESENTATIONS AND WARRANTIES. The Company hereby represents and
warrants to the Holder that all Shares which may be issued upon the exercise of
the purchase right represented by this Warrant, and all securities, if any,
issuable upon conversion of the Shares (assuming payment of the Warrant Price),
shall, upon issuance, be duly authorized, validly issued, fully paid and
nonassessable, and free of any liens and encumbrances except for restrictions on
transfer provided for herein or under applicable federal and state securities
laws. The issued and outstanding shares of the Company on the Issue Date are set
forth in the capitalization table attached hereto.

     3.2 NOTICE OF CERTAIN EVENTS. If the Company proposes at any time (a) to
declare any dividend or distribution upon its common stock, whether in cash,
property, stock, or other securities and whether or not a regular cash dividend;
(b) to effect any reclassification or recapitalization of common stock; or (c)
to merge or consolidate with or into any other corporation, or sell, or
otherwise convey all or substantially all of its assets, or to liquidate,
dissolve or wind up; or (d) offer holders of registration rights the opportunity
to participate in an underwritten public offering of the Company's securities
for cash, then, in connection with each such event, the Company shall give
Holder (1) in respect of the matters referred to in (b) and (c) above, at least
20 days prior written notice of the date on which a record will be taken for
such dividend or distribution rights (and specifying the date on which the
holders of common stock will

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be entitled thereto) or for determining rights to vote, if any; (2) in the case
of the matters referred to in (b) and (c) above at least 20 days prior written
notice of the date when the same will take place (and specifying the date on
which the holders of common stock will be entitled to exchange their common
stock for securities or other property deliverable upon the occurrence of such
event); and (3) in the case of the matter referred to in (d) above, the same
notice as is given to the holders of such registration rights.

     3.3 INFORMATION RIGHTS. So long as the Holder holds this Warrant and/or any
of the Shares, the Company shall deliver to the Holder promptly after mailing,
copies of all notices or other written communications it would be entitled to
were it a shareholder.

     3.4 REGISTRATION UNDER SECURITIES ACT OF 1933, AS AMENDED. The Holder of
the Warrant shall become a party to the Amended and Restated Investor Rights
Agreement, except for the right of first refusal set forth therein, and the
common stock into which the Shares are convertible shall be subject to the
registration rights granted to the purchasers in the Equity Event or, if this
Warrant is for another Series of Preferred Stock, then the registration rights
held by the purchasers of such Preferred Stock.

ARTICLE 4.     REPRESENTATIONS AND COVENANTS OF HOLDER.

     This Warrant has been entered into by the Company in reliance upon the
following representations and covenants of Holder, which by its acceptance
hereof the Holder (including any permitted transferee of Holder on behalf of
such transferee) hereby confirms:

     4.1 INVESTMENT PURPOSE. The right to acquire Preferred Stock or the
Preferred Stock issuable upon exercise of Holder's rights contained herein will
be acquired for investment and not with a view to the sale or distribution of
any part thereof; and the Holder has no present intention of selling or engaging
in any public distribution of the same except pursuant to a registration or
exemption.

     4.2 PRIVATE ISSUE. Holder understands (i) that the Preferred Stock,
issuable upon exercise of the Holder's rights contained herein is not registered
under the 1933 Act or qualified under applicable state securities laws on the
ground that the issuance contemplated by this Warrant Agreement will be exempt
from the registration and qualifications requirements thereof; and (ii) that the
Company's reliance on such exemption is predicated on the representations set
forth in this Section 4.

     4.3 FINANCIAL RISK. Holder has such knowledge and experience in financial
and business matters as to be capable of evaluating the merits and risks of its
investment and has the ability to bear the economic risks of its investment.

     4.4 RISK OF NO REGISTRATION. Holder understands that if the Company does
not register with the Securities and Exchange Commission pursuant to Section 12
of the 1933 Act, or file reports pursuant to Section 15(d) of the Securities
Exchange Act of 1934 (the "1934 Act"), or if a registration statement covering
the securities under the 1933 Act is not in effect when it desires to sell (i)
the rights to purchase Preferred Stock pursuant to this Warrant Agreement, or
(ii) the Preferred Stock issuable upon exercise of the right to purchase, it may
be required to hold

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such securities for an indefinite period. The Holder also understands that any
sale of the rights of the Holder to purchase Preferred Stock which might be made
by it in reliance upon Rule 144 under the 1933 Act may be made only in
accordance with the terms and conditions of that Rule.

     4.5 ACCREDITED INVESTOR. Holder is an "accredited investor" within the
meaning of Rule 501 of Regulation D under the Act, as presently in effect.

ARTICLE 5.     MISCELLANEOUS.

     5.1 TERM. This Warrant is exercisable, in whole or in part, at any time and
from time to time on or before the Expiration Date.

     5.2 LEGENDS. This Warrant and the Shares (and the securities issuable,
directly or indirectly, upon conversion of the Shares, if any) shall be
imprinted with a legend in substantially the following form:

          THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
          1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED OR OTHERWISE
          TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT
          OR PURSUANT TO RULE 144 OR AN OPINION OF COUNSEL REASONABLY
          SATISFACTORY TO THE CORPORATION AND ITS COUNSEL THAT SUCH REGISTRATION
          IS NOT REQUIRED.

     5.3 COMPLIANCE WITH SECURITIES LAWS ON TRANSFER. This Warrant and the
Shares issuable upon exercise this Warrant (and the securities issuable,
directly or indirectly, upon conversion of the Shares, if any) may not be
transferred or assigned in whole or in part without compliance with applicable
federal and state securities laws by the transferor and the transferee
(including, without limitation, the delivery of investment representation
letters and legal opinions reasonably satisfactory to the Company, as reasonably
requested by the Company). The Company shall not require Holder to provide an
opinion of counsel if the transfer is to an affiliate of Holder or if there is
no material question as to the availability of current information as referenced
in Rule 144(c), Holder represents that it has complied with Rule 144(d) and (e)
in reasonable detail, the selling broker represents that it has complied with
Rule 144(f), and the Company is provided with a copy of Holder's notice of
proposed sale.

     5.4 TRANSFER PROCEDURE. Subject to the provisions of Sections 4.2 and 4.3,
Holder may transfer all or part of this Warrant or the Shares issuable upon
exercise of this Warrant (or the securities issuable, directly or indirectly,
upon conversion of the Shares, if any) by giving the Company notice of the
portion of the Warrant being transferred setting forth the name, address and
taxpayer identification number of the transferee and surrendering this Warrant
to the Company for reissuance to the transferee(s) (and Holder if applicable).
Unless the Company is filing financial information with the SEC pursuant to the
Securities Exchange Act of 1934, the Company shall have the right to refuse to
transfer any portion of this Warrant to any person who directly competes with
the Company.

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     5.5 NOTICES. All notices and other communications from the Company to the
Holder, or vice versa, shall be deemed delivered and effective when given
personally or mailed by first-class registered or certified mail, postage
prepaid, at such address as may have been furnished to the Company or the
Holder, as the case may be, in writing by the Company or such holder from time
to time.

     5.6 WAIVER. This Warrant and any term hereof may be changed, waived,
discharged or terminated only by an instrument in writing signed by the party
against which enforcement of such change, waiver, discharge or termination is
sought.

     5.7 ATTORNEYS FEES. In the event of any dispute between the parties
concerning the terms and provisions of this Warrant, the party prevailing in
such dispute shall be entitled to collect from the other party all costs
incurred in such dispute, including reasonable attorneys' fees.

     5.8 GOVERNING LAW. This Warrant shall be governed by and construed in
accordance with the laws of the State of California, without giving effect to
its principles regarding conflicts of law.

                              "COMPANY"

                              ENDGATE CORPORATION

                              By: /s/ EDWARD KEIBLE, JR.
                                 ----------------------------------------------

                              Title: PRESIDENT AND CEO
                                    -------------------------------------------

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                                   APPENDIX 1

                               NOTICE OF EXERCISE

     1. The undersigned hereby elects to purchase ___________shares of the
Common/Series __________ Preferred [strike one] Stock of _________________
pursuant to the terms of the attached Warrant and tenders herewith payment of
the purchase price of such shares in full.

     2. The undersigned hereby elects to convert the attached Warrant into
Shares/cash [strike one] in the manner specified in the Warrant. This conversion
is exercised with respect to _____________________ of the Shares covered by the
Warrant.

     [Strike paragraph that does not apply.]

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

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

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

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

     4. The undersigned represents it is acquiring the shares solely for its own
account and not as a nominee for any other party and not with a view toward the
resale or distribution thereof except in compliance with applicable securities
laws.

-----------------------------
(Signature)

-----------------------------
(Date)

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                                    EXHIBIT A

                            Anti-Dilution Provisions

      (FOR PREFERRED STOCK WARRANTS WITH EXISTING ANTI-DILUTION PROTECTION)

     In the event of the issuance (a "Diluting Issuance") by the Company, after
the Issue Date of the Warrant, of securities at a price per share less than the
warrant Price, then the number of shares of common stock issuable upon
conversion of the Shares shall be adjusted in accordance with those provisions
(the "Provisions") of the Company's Certificate of Incorporation that apply to
Diluting Issuance's with respect to the class or series of the Company's stock
for which this Warrant is exercisable.<PAGE>

                                                                    EXHIBIT 10.2

                         ENDGATE TECHNOLOGY CORPORATION

                             1992 STOCK OPTION PLAN

             ADOPTED BY THE BOARD OF DIRECTORS ON SEPTEMBER 21, 1992
              AND APPROVED BY THE STOCKHOLDERS ON FEBRUARY 18, 1993
              AMENDED BY THE BOARD OF DIRECTORS ON JANUARY 19, 1994
                AND APPROVED BY THE STOCKHOLDERS ON MAY 10, 1994
               AMENDED BY THE BOARD OF DIRECTORS ON JULY 30, 1997
                       AND APPROVED BY THE STOCKHOLDERS ON
               AMENDED BY THE BOARD OF DIRECTORS ON MARCH 27, 1998
               AND APPROVED BY THE STOCKHOLDERS ON MARCH 27, 1998
                AMENDED BY THE BOARD OF DIRECTORS ON MAY 27, 1998
               AMENDED BY THE BOARD OF DIRECTORS ON APRIL 22, 1999
               AND APPROVED BY THE STOCKHOLDERS ON APRIL 22, 1999

1.       PURPOSES.

         (a)  The purpose of the Plan is to provide a means by which
selected Employees and Directors of and Consultants to the Company, and its
Affiliates, may be given an opportunity to purchase stock of the Company.

         (b)  The Company, by means of the Plan, seeks to retain the services of
persons who are now Employees or Directors of or Consultants to the Company, to
secure and retain the services of new Employees, Directors and Consultants, and
to provide incentives for such persons to exert maximum efforts for the success
of the Company.

         (c)  The Company intends that the Options issued under the Plan shall,
in the discretion of the Board or any Committee to which responsibility for
administration of the Plan has been delegated pursuant to subsection 3(c), be
either Incentive Stock Options or Nonstatutory Stock Options. All Options shall
be separately designated Incentive Stock Options or Nonstatutory Stock Options
at the time of grant, and in such form as issued pursuant to section 6, and a
separate certificate or certificates will be issued for shares purchased on
exercise of each type of Option.

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2.       DEFINITIONS.

         (a)  "AFFILIATE" means any parent corporation or subsidiary
corporation, whether now or hereafter existing, as those terms are defined in
Sections 424(e) and (f) respectively, of the Code.

         (b)  "BOARD" means the Board of Directors of the Company.

         (c)  "CODE" means the Internal Revenue Code of 1986, as amended.

         (d)  "COMMITTEE"  means a Committee  appointed by the Board in
accordance  with subsection 3(c) of the Plan.

         (e)  "COMPANY" means Endgate Technology Corporation, a California
corporation.

         (f)  "CONSULTANT" means any person, including an advisor, engaged by
the Company or an Affiliate to render consulting or advisory services and who is
compensated for such services, PROVIDED that the term "Consultant" shall not
include Directors who are paid only a director's fee by the Company or who are
not compensated by the Company for their services as Directors.

         (g)  "CONTINUOUS STATUS AS AN EMPLOYEE, DIRECTOR OR CONSULTANT"
means the employment or relationship as a Director or Consultant is not
interrupted or terminated by the Company or any Affiliate. The Board, in its
sole discretion, may determine whether Continuous Status as an Employee,
Director or Consultant shall be considered interrupted in the case of: (i) any
leave of absence approved by the Board, including sick leave, military leave, or
any other personal leave; PROVIDED, HOWEVER, that for purposes of Incentive
Stock Options, any such leave may not exceed ninety (90) days, unless
reemployment upon the expiration of such leave is guaranteed by contract
(including certain Company policies) or statute; or (ii) transfers between
locations of the Company or between the Company, Affiliates or its successor.

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         (h)  "DIRECTOR" means a member of the Board.

         (i)  "DISINTERESTED PERSON" means a Director: (i) who was not during
the one year prior to service as an administrator of the Plan granted or awarded
equity securities pursuant to the Plan or any other plan of the Company or any
of its affiliates entitling the participants therein to acquire equity
securities of the Company or any of its affiliates except as permitted by Rule
16b-3(c)(2)(i); or (ii) who is otherwise considered to be a "disinterested
person" in accordance with Rule 16b-3(c)(2)(i), or any other applicable rules,
regulations or interpretations of the Securities and Exchange Commission.

         (j)  "EMPLOYEE" means any person, including Officers and Directors,
employed by the Company or any Affiliate of the Company. Neither service as a
Director nor payment of a director's fee by the Company shall be sufficient to
constitute "employment" by the Company.

         (k)  "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

         (l)  "FAIR  MARKET  VALUE"  means,  as of any  date,  the  value of the
common stock of the Company determined as follows:

              (1)  If the common stock is listed on any established stock
exchange or a national market system, including without limitation the National
Market System of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, the Fair Market Value of a share of common stock
shall be the closing sales price for such stock (or the closing bid, if no sales
were reported) as quoted on such system or exchange (or the exchange with the
greatest volume of trading in common stock) on the last market trading day prior
to the day of determination, as reporting in the Wall Street Journal or such
other source as the Board deems reliable;

              (2)  If the common stock is quoted on the NASDAQ System (but not
on the National Market System thereof) or is regularly quoted by a recognized
securities dealer but

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selling prices are not reported, the Fair Market Value of a share of common
stock shall be the mean between the high bid and high asked prices for the
common stock on the last market trading day prior to the day of determination,
as reported in the Wall Street Journal or such other source as the Board deems
reliable;

              (3)  In the absence of an established market for the common stock,
 the Fair Market Value shall be determined in good faith by the Board.

         (m)  "INCENTIVE STOCK OPTION" means an Option intended to qualify as an
incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.

         (n)  "NONSTATUTORY  STOCK  OPTION"  means an Option not  intended  to
qualify  as an  Incentive  Stock Option.

         (o)  "OFFICER" means a person who is an officer of the Company within
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

         (p)  "OPTION" means a stock option granted pursuant to the Plan.

         (q)  "OPTION AGREEMENT" means a written agreement between the Company
and an Optionee evidencing the terms and conditions of an individual Option
grant. The Option Agreement is subject to the terms and conditions of the Plan.

         (r)  "OPTIONED STOCK" means the common stock of the Company subject to
an Option.

         (s)  "OPTIONEE" means an Employee, Director or Consultant who holds an
outstanding Option.

         (t)  "PLAN" means this 1992 Stock Option Plan.

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<PAGE>

         (u)  "RULE 16B-3" means Rule 16b-3 of the  Exchange Act or any
successor to Rule 16b-3, as in effect when discretion is being exercised with
respect to the Plan.

3.       ADMINISTRATION.

         (a)  The Plan shall be administered by the Board unless and until the
Board delegates administration to a Committee, as provided in subsection 3 (c).

         (b)  The Board  shall  have the  power,  subject  to, and  within  the
limitations of, the express provisions of the Plan:

              (1)  To determine from time to time which of the persons eligible
under the Plan shall be granted Options; when and how the Option shall be
granted; whether the Option will be an Incentive Stock Option or a Nonstatutory
Stock Option; the provisions of each Option granted (which need not be
identical), including the time or times such Option may be exercised in whole or
in part; and the number of shares for which an Option shall be granted to each
such person.

              (2)  To construe and interpret the Plan and Options granted under
it, and to establish, amend and revoke rules and regulations for its
administration. The Board, in the exercise of this power, may correct any
defect, omission or inconsistency in the Plan or in any Option Agreement, in a
manner and to the extent it shall deem necessary or expedient to make the Plan
fully effective.

              (3)  To amend the Plan as provided in Section 11.

         (c)  The Board may delegate administration of the Plan to a committee
composed of not fewer than two (2) members (the "Committee"), all of the members
of which Committee shall be disinterested persons, if required and as defined by
the provisions of subsection 3(d). If administration is delegated to a
Committee, the Committee shall have, in connection with the administration of
the Plan, the powers theretofore possessed by the Board (and references in this

                                       5
<PAGE>

Plan to the Board shall thereafter be to the Committee), subject, however, to
such resolutions, not inconsistent with the provisions of the Plan, as may be
adopted from time to time by the Board. The Board may abolish the Committee at
any time and revest in the Board the administration of the Plan. Additionally,
prior to the date of the first registration of an equity security of the Company
under Section 12 of the Exchange Act, and notwithstanding anything to the
contrary contained herein, the Board may delegate administration of the Plan to
any person or persons and the term "Committee" shall apply to any person or
persons to whom such authority has been delegated.

         (d)  Any requirement that an administrator of the Plan be a
Disinterested Person shall not apply (i) prior to the date of the first
registration of an equity security of the Company under Section 12 of the
Exchange Act, or (ii) if the Board or the Committee expressly declares that such
requirement shall not apply. Any Disinterested Person shall otherwise comply
with the requirements of Rule 16b-3.

4. SHARES SUBJECT TO THE PLAN.

         (a)  Subject to the provisions of Section 10 relating to adjustments
upon changes in stock, the stock that may be sold pursuant to Options shall not
exceed in the aggregate nine million one hundred eighty-four thousand fifty-five
(9,184,055) shares of the Company's common stock. If any Option shall for any
reason expire or otherwise terminate without having been exercised in full, the
stock not purchased under such Option shall again become available for the Plan.

         (b)  The stock subject to the Plan may be unissued shares or reacquired
shares, bought on the market or otherwise.

                                       6
<PAGE>

5.       ELIGIBILITY.

         (a)  Incentive  Stock  Options may be granted only to  Employees.
Nonstatutory Stock Options may be granted only to Employees, Directors or
Consultants.

         (b)  A Director shall in no event be eligible for the benefits of the
Plan unless at the time discretion is exercised in the selection of the Director
as a person to whom Options may be granted, or in the determination of the
number of shares which may be covered by Options granted to the Director: (i)
the Board has delegated its discretionary authority over the Plan to a Committee
which consists solely of Disinterested Persons; or (ii) the Plan otherwise
complies with the requirements of Rule 16b 3. The Board shall otherwise comply
with the requirements of Rule 16b 3. This subsection 5(b) shall not apply (i)
prior to the date of the first registration of an equity security of the Company
under Section 12 of the Exchange Act, or (ii) if the Board or Committee
expressly declares that it shall not apply.

         (c)  No person shall be eligible for the grant of an Option if, at the
time of grant, such person owns (or is deemed to own pursuant to Section 424(d)
of the Code) stock possessing more than ten percent (10%) of the total combined
voting power of all classes of stock of the Company or of any of its Affiliates
unless the exercise price of such Option is at least one hundred ten percent
(110%) of the Fair Market Value of such stock at the date of grant and the
Option is not exercisable after the expiration of five (5) years from the date
of grant.

6.       OPTION PROVISIONS.

         Each Option shall be in such form and shall contain such terms and
conditions as the Board shall deem appropriate. The provisions of separate
Options need not be identical, but each Option shall include (through
incorporation of provisions hereof by reference in the Option or otherwise) the
substance of each of the following provisions:

                                       7
<PAGE>

         (a)  TERM.  No Option shall be  exercisable  after the  expiration  of
ten (10) years from the date it was granted.

         (b)  PRICE. The exercise price of each Incentive Stock Option shall be
not less than one hundred percent (100%) of the fair market value of the stock
subject to the Option on the date the Option is granted. The exercise price of
each Nonstatutory Stock Option shall be not less than eighty five percent (85%)
of the fair market value of the stock subject to the Option on the date the
Option is granted.

         (c)  CONSIDERATION. The purchase price of stock acquired pursuant to an
Option shall be paid, to the extent permitted by applicable statutes and
regulations, either (i) in cash at the time the option is exercised, or (ii) at
the discretion of the Board or the Committee, either at the time of the grant or
exercise of the Option, (A) by delivery to the Company of other common stock of
the Company, (B) according to a deferred payment or other arrangement (which may
include, without limiting the generality of the foregoing, the use of other
common stock of the Company) with the person to whom the Option is granted or to
whom the Option is transferred pursuant to subsection 6(d), or (C) in any other
form of legal consideration that may be acceptable to the Board.

         In the case of any deferred payment arrangement, interest shall be
payable at least annually and shall be charged at the minimum rate of interest
necessary to avoid the treatment as interest, under any applicable provisions of
the Code, of any amounts other than amounts stated to be interest under the
deferred payment arrangement.

         (d)  TRANSFERABILITY. An Incentive Stock Option shall not be
transferable except by will or by the laws of descent and distribution, and
shall be exercisable during the lifetime of the person to whom the Incentive
Stock Option is granted only by such person. A Nonstatutory Stock Option shall
not be transferable except by will or by the laws of descent and distribution or

                                       8
<PAGE>

pursuant to a qualified domestic relations order as defined by the Code or Title
I of the Employee Retirement Income Security Act, or the rules thereunder (a
"QDRO"), and shall be exercisable during the lifetime of the person to whom the
Option is granted only by such person or any transferee pursuant to a QDRO.

         (e)  VESTING. The total number of shares of stock subject to an Option
may, but need not, be allotted in periodic installments (which may, but need
not, be equal). The Option Agreement may provide that from time to time during
each of such installment periods, the Option may become exercisable ("vest")
with respect to some or all of the shares allotted to that period, and may be
exercised with respect to some or all of the shares allotted to such period
and/or any prior period as to which the Option became vested but was not fully
exercised. The Option may be subject to such other terms and conditions on the
time or times when it may be exercised (which may be based on performance or
other criteria) as the Board may deem appropriate. The vesting provisions of
individual Options may vary but in each case will provide for vesting of at
least twenty percent (20%) per year of the total number of shares subject to the
Option. The provisions of this subsection 6(e) are subject to any Option
provisions governing the minimum number of shares as to which an Option may be
exercised.

         (f)  SECURITIES LAW COMPLIANCE. The Company may require any Optionee,
or any person to whom an Option is transferred under subsection 6(d), as a
condition of exercising any such Option, (1) to give written assurances
satisfactory to the Company as to the Optionee's knowledge and experience in
financial and business matters and/or to employ a purchaser representative
reasonably satisfactory to the Company who is knowledgeable and experienced in
financial and business matters, and that he or she is capable of evaluating,
alone or together with the purchaser representative, the merits and risks of
exercising the Option; and (2) to give written assurances satisfactory to the
Company stating that such person is acquiring the stock subject to

                                       9
<PAGE>

the Option for such person's own account and not with any present intention of
selling or otherwise distributing the stock. These requirements, and any
assurances given pursuant to such requirements, shall be inoperative if (i) the
issuance of the shares upon the exercise of the Option has been registered under
a then currently effective registration statement under the Securities Act of
1933, as amended (the "Securities Act"), or (ii) as to any particular
requirement, a determination is made by counsel for the Company that such
requirement need not be met in the circumstances under the then applicable
securities laws.

         (g)  TERMINATION OF EMPLOYMENT OR RELATIONSHIP AS A DIRECTOR OR
CONSULTANT. In the event an Optionee's Continuous Status as an Employee,
Director or Consultant terminates (other than upon the Optionee's death or
disability), the Optionee may exercise his or her Option, but only within such
period of time as is determined by the Board, and only to the extent that the
Optionee was entitled to exercise it at the date of termination (but in no event
later than the expiration of the term of such Option as set forth in the Option
Agreement). In the case of an Incentive Stock Option, the Board shall determine
such period of time (in no event to exceed three (3) months from the date of
termination) when the Option is granted. If, at the date of termination, the
Optionee is not entitled to exercise his or her entire Option, the shares
covered by the unexercisable portion of the Option shall revert to the Plan. If,
after termination, the Optionee does not exercise his or her Option within the
time specified in the Option Agreement, the Option shall terminate, and the
shares covered by such Option shall revert to the Plan.

         (h)  DISABILITY OF OPTIONEE. In the event an Optionee's Continuous
Status as an Employee, Director or Consultant terminates as a result of the
Optionee's disability, the Optionee may exercise his or her Option, but only
within twelve (12) months from the date of such termination (or such shorter
period specified in the Option Agreement), and only to the extent that the
Optionee was entitled to exercise it at the date of such termination (but in no
event later

                                       10
<PAGE>

than the expiration of the term of such Option as set forth in the Option
Agreement). If, at the date of termination, the Optionee is not entitled to
exercise his or her entire Option, the shares covered by the unexercisable
portion of the Option shall revert to the Plan. If, after termination, the
Optionee does not exercise his or her Option within the time specified herein,
the Option shall terminate, and the shares covered by such Option shall revert
to the Plan.

         (i)  DEATH OF OPTIONEE. In the event of the death of an Optionee, the
Option may be exercised, at any time within twelve (12) months following the
date of death (or such shorter period specified in the Option Agreement) (but in
no event later than the expiration of the term of such Option as set forth in
the Option Agreement), by the 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 was entitled to exercise the Option at the date of death. If, at
the time of death, the Optionee was not entitled to exercise his or her entire
Option, the shares covered by the unexercisable portion of the Option shall
revert to the Plan. If, after death, the Optionee's estate or a person who
acquired the right to exercise the Option by bequest or inheritance does not
exercise the Option within the time specified herein, the Option shall
terminate, and the shares covered by such Option shall revert to the Plan.

         (j)  EARLY EXERCISE. The Option may, but need not, include a provision
whereby the Optionee may elect at any time while an Employee, Director or
Consultant to exercise the Option as to any part or all of the shares subject to
the Option prior to the full vesting of the Option. Any unvested shares so
purchased may be subject to a repurchase right in favor of the Company or to any
other restriction the Board determines to be appropriate.

         (k)  WITHHOLDING. To the extent provided by the terms of an Option
Agreement, the Optionee may satisfy any federal, state or local tax withholding
obligation relating to the exercise of such Option by any of the following means
or by a combination of such means: (1) tendering

                                       11
<PAGE>

a cash payment; (2) authorizing the Company to withhold shares from the shares
of the common stock otherwise issuable to the participant as a result of the
exercise of the Option; or (3) delivering to the Company owned and unencumbered
shares of the common stock of the Company.

7.       COVENANTS OF THE COMPANY.

         (a)  During the terms of the Options, the Company shall keep available
at all times the number of shares of stock required to satisfy such Options.

         (b)  The Company shall seek to obtain from each regulatory commission
or agency having jurisdiction over the Plan such authority as may be required to
issue and sell shares of stock upon exercise of the Options; PROVIDED, HOWEVER,
that this undertaking shall not require the Company to register under the
Securities Act either the Plan, any Option or any stock issued or issuable
pursuant to any such Option. If, after reasonable efforts, the Company is unable
to obtain from any such regulatory commission or agency the authority which
counsel for the Company deems necessary for the lawful issuance and sale of
stock under the Plan, the Company shall be relieved from any liability for
failure to issue and sell stock upon exercise of such Options unless and until
such authority is obtained.

8.       USE OF PROCEEDS FROM STOCK.

         Proceeds from the sale of stock pursuant to Options shall constitute
general funds of the Company.

9.       MISCELLANEOUS.

         (a)  Neither an Optionee nor any person to whom an Option is
transferred under subsection 6(d) shall be deemed to be the holder of, or to
have any of the rights of a holder with respect to, any shares subject to such
Option unless and until such person has satisfied all requirements for exercise
of the Option pursuant to its terms.

                                       12
<PAGE>

         (b) Throughout the term of any Option, the Company shall deliver to the
holder of such Option, not later than one hundred twenty (120) days after the
close of each of the Company's fiscal years during the Option term, such
financial and other information regarding the Company as comprises the annual
report to the stockholders of the Company provided for in the bylaws of the
Company.

         (c)  Nothing in the Plan or any instrument executed or Option granted
pursuant thereto shall confer upon any Employee, Director, Consultant or
Optionee any right to continue in the employ of the Company or any Affiliate (or
to continue acting as a Director or Consultant) or shall affect the right of the
Company or any Affiliate to terminate the employment or relationship as a
Director or Consultant of any Employee, Director, Consultant or Optionee with or
without cause.

         (d)  To the extent that the aggregate Fair Market Value (determined at
the time of grant) of stock with respect to which Incentive Stock Options
granted after 1986 are exercisable for the first time by any Optionee during any
calendar year under all plans of the Company and its Affiliates exceeds one
hundred thousand dollars ($100,000), the Options or portions thereof which
exceed such limit (according to the order in which they were granted) shall be
treated as Nonstatutory Stock Options.

10.      ADJUSTMENTS UPON CHANGES IN STOCK.

         (a)  If any change is made in the stock subject to the Plan, or subject
to any Option (through merger, consolidation, reorganization, recapitalization,
stock dividend, dividend in property other than cash, stock split, liquidating
dividend, combination of shares, exchange of shares, change in corporate
structure or otherwise), the Plan and outstanding Options will be appropriately
adjusted in the class(es) and maximum number of shares subject to the Plan and
the class(es) and number of shares and price per share of stock subject to
outstanding Options.

                                       13
<PAGE>

         (b)  In the event of: (1) a merger or consolidation in which the
Company is not the surviving corporation or (2) a reverse merger in which the
Company is the surviving corporation but the shares of the Company's common
stock outstanding immediately preceding the merger are converted by virtue of
the merger into other property, whether in the form of securities, cash or
otherwise then to the extent permitted by applicable law: (i) any surviving
corporation shall assume any Options outstanding under the Plan or shall
substitute similar Options for those outstanding under the Plan, or (ii) such
Options shall continue in full force and effect. In the event any surviving
corporation refuses to assume or continue such Options, or to substitute similar
options for those outstanding under the Plan, then such Options shall be
terminated if not exercised prior to such event. In the event of a dissolution
or liquidation of the Company, any Options outstanding under the Plan shall
terminate if not exercised prior to such event.

11.      AMENDMENT OF THE PLAN.

         (a)  The Board at any time, and from time to time, may amend the Plan.
However, except as provided in Section 10 relating to adjustments upon changes
in stock, no amendment shall be effective unless approved by the stockholders of
the Company within twelve (12) months before or after the adoption of the
amendment, where the amendment will:

              (1)  Increase the number of shares reserved for options under the
Plan;

              (2)  Modify the requirements as to eligibility for participation
in the Plan (to the extent such modification requires stockholder approval in
order for the Plan to satisfy the requirements of Section 422 of the Code); or

              (3)  Modify the Plan in any other way if such modification
requires stockholder approval in order for the Plan to satisfy the requirements
of Section 422 of the Code or to comply with the requirements of Rule 16b 3.

                                       14
<PAGE>

         (b)  It is expressly contemplated that the Board may amend the Plan in
any respect the Board deems necessary or advisable to provide Optionees with the
maximum benefits provided or to be provided under the provisions of the Code and
the regulations promulgated thereunder relating to Incentive Stock Options
and/or to bring the Plan and/or Incentive Stock Options granted under it into
compliance therewith.

         (c)  Rights and obligations under any Option granted before amendment
of the Plan shall not be altered or impaired by any amendment of the Plan unless
(i) the Company requests the consent of the person to whom the Option was
granted and (ii) such person consents in writing.

12.      TERMINATION OR SUSPENSION OF THE PLAN.

         (a)  The Board may suspend or terminate the Plan at any time. Unless
sooner terminated, the Plan shall terminate on September 20, 2002. No Options
may be granted under the Plan while the Plan is suspended or after it is
terminated.

         (b)  Rights and obligations under any Option granted while the Plan is
in effect shall not be altered or impaired by suspension or termination of the
Plan, except with the consent of the person to whom the Option was granted.

13.      EFFECTIVE DATE OF PLAN.

         The Plan shall become effective as determined by the Board, but no
Options granted under the Plan shall be exercised unless and until the Plan has
been approved by the stockholders of the Company, and, if required, an
appropriate permit has been issued by the Commissioner of Corporations of the
State of California.

                                       15

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