<PAGE>   1
                                                                Exhibit 10.2




                            WALL DATA INCORPORATED

                            1993 STOCK OPTION PLAN

                  AS AMENDED AND RESTATED ON OCTOBER 15, 1996

SECTION 1.  PURPOSE

         The purpose of the 1993 Restated Stock Option Plan (this "Plan") is to
provide a means whereby selected employees, directors, officers, agents,
consultants, advisors and independent contractors of Wall Data Incorporated
(the "Company"), or of any parent or subsidiary (as defined in subsection 5.8
and referred to hereinafter as "related corporations") thereof, may be granted
incentive stock options and/or nonqualified stock options to purchase the
Common Stock (as defined in Section 3) of the Company, in order to attract and
retain the services or advice of such employees, directors, officers, agents,
consultants, advisors and independent contractors and to provide added
incentive to such persons by encouraging stock ownership in the Company.

SECTION 2.  ADMINISTRATION

         This Plan shall be administered by the Board of Directors of the
Company (the "Board") or a committee or committees (which term includes
subcommittees) appointed by, and consisting of two or more members of, the
Board.  The administrator of this Plan shall hereinafter be referred to as the
"Plan Administrator."  If and so long as the Common Stock is registered under
Section 12(b) or 12(g) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), the Board shall consider, in selecting the Plan Administrator
and the membership of any committee acting as Plan Administrator of the Plan
with respect to any persons subject or likely to become subject to Section 16
under the Exchange Act, the provisions regarding (a) "outside directors," as
contemplated by Section 162(m) of the Internal Revenue Code of 1986, as amended
(the "Code"), and (b) "nonemployee directors," as contemplated by Rule 16b-3
under the Exchange Act.  The Board may delegate the responsibility for
administering the Plan with respect to designated classes of eligible
Participants to different committees, subject to such limitations as the Board
deems appropriate.  Committee members shall serve for such term as the Board
may determine, subject to removal by the Board at any time.



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Wall Data Incorporated                                                   Page 1
1993 Stock Option Plan
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         2.1     PROCEDURES

         The Board shall designate one of the members of the Plan Administrator
as chairman.  The Plan Administrator may hold meetings at such times and places
as it shall determine.  The acts of a majority of the members of the Plan
Administrator present at meetings at which a quorum exists, or acts reduced to
or approved in writing by all Plan Administrator members, shall be valid acts
of the Plan Administrator.

         2.2     RESPONSIBILITIES

         Except for the terms and conditions explicitly set forth in this Plan,
the Plan Administrator shall have the authority, in its discretion, to
determine all matters relating to the options to be granted under this Plan,
including selection of the individuals to be granted options, the number of
shares to be subject to each option, the exercise price, and all other terms
and conditions of the options.  Grants under this Plan need not be identical in
any respect, even when made simultaneously.  The interpretation and
construction by the Plan Administrator of any terms or provisions of this Plan
or any option issued hereunder, or of any rule or regulation promulgated in
connection herewith, shall be conclusive and binding on all interested parties,
so long as such interpretation and construction with respect to incentive stock
options correspond to the requirements of Section 422 of the Code, the
regulations thereunder and any amendments thereto.

         2.3     SECTION 16(B) COMPLIANCE AND BIFURCATION OF PLAN

         Notwithstanding anything in this Plan to the contrary, the Board, in
its absolute discretion, may bifurcate this Plan so as to restrict, limit or
condition the use of any provision of this Plan to participants who are
officers and directors subject to Section 16 of the Exchange Act without so
restricting, limiting or conditioning this Plan with respect to other
participants.

SECTION 3.  STOCK SUBJECT TO THIS PLAN

         The stock subject to this Plan shall be the Company's Common Stock
(the "Common Stock") presently authorized but unissued or subsequently acquired
by the Company.  Subject to adjustment as provided in Section 7, the aggregate
amount of Common Stock to be delivered upon the exercise of all options granted
under this Plan shall not exceed (a) 835,000 shares as such Common Stock was
constituted on the effective date of this Plan, as restated, plus (b) an
additional number of shares of its Common Stock equal to the number of shares
of Common Stock which are currently reserved for issuance under this
corporation's 1983 Restated Stock Option Plan and which become available at and
as of July 28, 1994 from the unexercised



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Wall Data Incorporated                                                   Page 2
1993 Stock Option Plan

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portion of cancelled or terminated or expired options outstanding under the
1983 Restated Stock Option Plan on the date hereof, up to a maximum of
1,625,000 shares of Common Stock (after giving effect to such 4:1 reverse stock
split).  If any option granted under this Plan shall expire or be surrendered,
exchanged for another option, cancelled or terminated for any reason without
having been exercised in full, the unpurchased shares subject thereto shall
thereupon again be available for purposes of this Plan, including for
replacement options which may be granted in exchange for such expired,
surrendered, exchanged, cancelled or terminated options.

SECTION 4.  ELIGIBILITY

         An incentive stock option may be granted only to any individual who,
at the time the option is granted, is an employee of the Company or any related
corporation.  A nonqualified stock option may be granted to any employee,
director, officer, agent, consultant, advisor or independent contractor of the
Company or any related corporation, whether an individual or an entity.  Any
party to whom an option is granted under this Plan shall be referred to
hereinafter as an "Optionee."

SECTION 5.  TERMS AND CONDITIONS OF OPTIONS

         Options granted under this Plan shall be evidenced by written
agreements which shall contain such terms, conditions, limitations and
restrictions as the Plan Administrator shall deem advisable and which are not
inconsistent with this Plan.  Notwithstanding the foregoing, options shall
include or incorporate by reference the following terms and conditions:

         5.1     NUMBER OF SHARES AND PRICE

         The maximum number of shares that may be purchased pursuant to the
exercise of each option and the price per share at which such option is
exercisable (the "exercise price") shall be as established by the Plan
Administrator, provided that the Plan Administrator shall act in good faith to
establish the exercise price which shall be not less than the fair market value
per share of the Common Stock at the time the option is granted with respect to
incentive stock options, and also provided that, with respect to incentive
stock options granted to greater than 10% shareholders, the exercise price
shall be as required by subsection 6.1.  Notwithstanding the foregoing, the
maximum number of shares with respect to which an option or options may be
granted to any Optionee in any one fiscal year of the Company shall not exceed
100,000 shares except that the Company may make an additional one-time grant to
newly-hired employees of up to 150,000 shares (the "Maximum Annual Optionee
Grant").



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Wall Data Incorporated                                                   Page 3
1993 Stock Option Plan


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         5.2     TERM AND MATURITY

         Subject to the restrictions contained in Section 6 with respect to
granting incentive stock options to greater than 10% shareholders, the term of
each incentive stock option shall be as established by the Plan Administrator
and, if not so established, shall be 10 years from the date it is granted but
in no event shall it exceed 10 years.  The term of each nonqualified stock
option shall be as established by the Plan Administrator and, if not so
established, shall be 10 years.  To ensure that the Company or related
corporation will achieve the purpose and receive the benefits contemplated in
this Plan, any option granted to any Optionee hereunder shall, unless the
condition of this sentence is waived or modified in the agreement evidencing
the option or by resolution adopted at any time by the Plan Administrator, be
exercisable according to the following schedule:

<TABLE>
<CAPTION>
Period of Optionee's Continuous Relationship
With the Company or Related Corporation From
       the Date the Option Is Granted            Portion of Total Option Which Is Exercisable
---------------------------------------------------------------------------------------------
      <S>                                                        <C>
               After one year                                         25%

      Each completed month thereafter                            An additional
                                                                    2.0833%
</TABLE>

         5.3     EXERCISE

         Subject to the vesting schedule described in subsection 5.2, each
option may be exercised in whole or in part at any time and from time to time;
provided, however, that no fewer than 100 shares (or the remaining shares then
purchasable under the option, if less than 100 shares) may be purchased upon
any exercise of option rights hereunder and that only whole shares will be
issued pursuant to the exercise of any option.  During an Optionee's lifetime,
any options granted under this Plan are personal to him or her and are
exercisable solely by such Optionee.  Options shall be exercised by delivery to
the Company of notice of the number of shares with respect to which the option
is exercised, together with payment of the exercise price.

         5.4     PAYMENT OF EXERCISE PRICE

         The exercise price for shares purchased under an option shall be paid
in full to the Company by delivery of consideration equal to the product of the
option exercise price and the number of shares purchased.  Such consideration
must be paid in cash or by check, or, unless the Plan Administrator at any time
determines otherwise, a



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Wall Data Incorporated                                                   Page 4
1993 Stock Option Plan

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combination of cash and/or check and one or both of the following alternative
forms:  (a) tendering Common Stock already owned by the Optionee for at least
six months (or any shorter period necessary to avoid a charge to the Company's
earnings for financial reporting purposes) having a fair market value on the
day prior to the exercise date equal to the aggregate option exercise price; or
(b) delivery of a properly executed exercise notice, together with irrevocable
instructions, to (i) a brokerage firm designated by the Company to deliver
promptly to the Company the aggregate amount of sale or loan proceeds to pay
the option exercise price and any withholding tax obligations that may arise in
connection with the exercise and (ii) the Company to deliver the certificates
for such purchased shares directly to such brokerage firm, all in accordance
with the regulations of the Federal Reserve Board.

         In addition, the exercise price for shares purchased under an option
may be paid, either singly or in combination with one or more of the
alternative forms of payment authorized by this Section 5.4, by (y) delivery of
a full-recourse promissory note executed by the Optionee; provided that (i)
such note delivered in connection with an incentive stock option shall, and
such note delivered in connection with a nonqualified stock option may, in the
sole discretion of the Plan Administrator, bear interest at a rate specified by
the Plan Administrator but in no case less than the rate required to avoid
imputation of interest (taking into account any exceptions to the imputed
interest rules) for federal income tax purposes, (ii) the Plan Administrator in
its sole discretion shall specify the term and other provisions of such note at
the time an incentive stock option is granted or at any time prior to exercise
of a nonqualified stock option, (iii) the Plan Administrator may require that
the Optionee pledge to the Company for the purpose of securing the payment of
such note the shares of Common Stock to be issued to the Optionee upon exercise
of the option and may require that the certificate representing such shares be
held in escrow in order to perfect the Company's security interest, and (iv)
the Plan Administrator in its sole discretion may at any time restrict or
rescind this right upon notification to the Optionee; or (z) such other
consideration as the Plan Administrator may permit.

         5.5     WITHHOLDING TAX REQUIREMENT

         The Company or any related corporation may require an Optionee to pay
the Company the amount of taxes required by any government to be withheld or
otherwise deducted and paid with respect to such payment. Subject to the Plan
and applicable law and unless the Plan Administrator determines otherwise, the
Optionee may satisfy withholding obligations, in whole or in part, by paying
cash, by electing to have the Company withhold shares of Common Stock or by
transferring shares of Common Stock to the Company, in such amounts as are
equivalent to the fair market value of the withholding obligation.  The Company
shall have the right to withhold from any shares of Common Stock issuable
pursuant to the exercise of an option or



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Wall Data Incorporated                                                   Page 5
1993 Stock Option Plan

<PAGE>   6
from any cash amounts otherwise due or to become due from the Company to the
Optionee an amount equal to such taxes.

         5.6     HOLDING PERIODS

                 5.6.1       SECURITIES AND EXCHANGE ACT SECTION 16

         If an individual subject to Section 16 of the Exchange Act sells
shares of Common Stock obtained upon the exercise of a stock option within six
months after the date the option was granted, such sale may result in
short-swing profit recovery under Section 16(b) of the Exchange Act.

                 5.6.2       TAXATION OF STOCK OPTIONS

         In order to obtain certain tax benefits afforded to incentive stock
options under Section 422 of the Code, an Optionee must hold the shares issued
upon the exercise of an incentive stock option for two years after the date of
grant of the option and one year from the date of exercise.  An Optionee may be
subject to the alternative minimum tax at the time of exercise of an incentive
stock option.

         The Plan Administrator may require an Optionee to give the Company
prompt notice of any disposition of shares of Common Stock acquired by the
exercise of an incentive stock option prior to the expiration of such holding
periods.

         Tax advice should be obtained when exercising any option and prior to
the disposition of the shares issued upon the exercise of any option.

         5.7     NONTRANSFERABILITY OF OPTIONS

         No option granted under the Plan may be assigned, pledged or
transferred by the Optionee other than by will or by the laws of descent and
distribution, and during the Optionee's lifetime, such options may be exercised
only by the Optionee or a permitted assignee or transferee of the Optionee (as
provided below).  Notwithstanding the foregoing, and to the extent permitted by
Section 422 of the Code, the Plan Administrator, in its sole discretion, may
permit such assignment, transfer and exercisability and may permit an Optionee
to designate a beneficiary who may exercise the option after the Optionee's
death; provided, however, that any option so assigned or transferred shall be
subject to all the same terms and conditions contained in the instrument
evidencing the option.

         5.8     TERMINATION OF RELATIONSHIP

         If the Optionee's relationship with the Company or any related
corporation ceases for any reason other than termination for cause, death or
total disability, and



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unless by its terms the option sooner terminates or expires, then the portion
of the option which is not exercisable at the time of such cessation shall
terminate immediately upon such cessation, unless the Plan Administrator
determines otherwise, and the portion of the option which is exercisable at the
time of such cessation (i) may be exercised for a three-month period after such
cessation and (ii) shall terminate at the end of such period following
cessation as to all shares for which it has not theretofore been exercised,
unless the Plan Administrator determines otherwise.  If, in the case of an
incentive stock option, an Optionee's relationship with the Company or any
related corporation changes (i.e., from employee to nonemployee, such as a
consultant), such change shall constitute a termination of an Optionee's
employment with the Company or any related corporation and the Optionee's
incentive stock option shall terminate in accordance with this subsection 5.8.
Upon the expiration of the three-month period following cessation of employment
in the case of an incentive stock option, or at any time prior to the
expiration of the option in the case of a nonqualified stock option, the Plan
Administrator shall have sole discretion in a particular circumstance to extend
the exercise period following such cessation to any date up to the termination
or expiration of the option.  If, however, in the case of an incentive stock
option, the Optionee does not exercise the Optionee's option within three
months after cessation of employment, the option will no longer qualify as an
incentive stock option under the Code.

         If an Optionee is terminated for cause, any option granted hereunder
shall automatically terminate as of the first discovery by the Company of any
reason for termination for cause, and such Optionee shall thereupon have no
right to purchase any shares pursuant to such option.  "Termination for cause"
shall mean dismissal for dishonesty, conviction or confession of a crime
punishable by law (except minor violations), fraud, misconduct or disclosure of
confidential information.  If an Optionee's relationship with the Company or
any related corporation is suspended pending an investigation of whether or not
the Optionee shall be terminated for cause, all the Optionee's rights under any
option granted hereunder likewise shall be suspended during the period of
investigation.

         If an Optionee's relationship with the Company or any related
corporation ceases because of a total disability, the portion of the Optionee's
option which is exercisable at the time of such cessation shall not terminate
or, in the case of an incentive stock option, cease to be treated as an
incentive stock option until the end of the 12-month period following such
cessation (unless by its terms it sooner terminates and expires).  As used in
this Plan, the term "total disability" refers to a mental or physical
impairment of the Optionee which is expected to result in death or which has
lasted or is expected to last for a continuous period of 12 months or more and
which causes the Optionee to be unable, in the opinion of the Company and two
independent physicians, to perform his or her duties for the Company and to be
engaged in any



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Wall Data Incorporated                                                   Page 7
1993 Stock Option Plan
<PAGE>   8
substantial gainful activity.  Total disability shall be deemed to have
occurred on the first day after the Company and the two independent physicians
have furnished their opinion of total disability to the Plan Administrator.

         Options granted under the Plan shall not be affected by any change of
relationship with the Company so long as the Optionee continues to be an
employee, director, officer, agent, consultant, advisor or independent
contractor of the Company or of a related corporation; however, a change in an
Optionee's status from an employee to a nonemployee (e.g., consultant or
independent contractor) shall result in the termination of an outstanding
incentive stock option held by such Optionee.  The Plan Administrator, in its
absolute discretion, may determine all questions of whether particular leaves
of absence constitute a termination of services; provided, however, that with
respect to incentive stock options, such determination shall be subject to any
requirements contained in the Code.  The foregoing notwithstanding, with
respect to incentive stock options, employment shall not be deemed to continue
beyond the first 90 days of such leave, unless the Optionee's reemployment
rights are guaranteed by statute or by contract.

         As used herein, the term "related corporation," when referring to a
subsidiary corporation, shall mean any corporation (other than the Company) in,
at the time of the granting of the option, an unbroken chain of corporations
ending with the Company, if stock possessing 50% or more of the total combined
voting power of all classes of stock of each of the corporations other than the
Company is owned by one of the other corporations in such chain.  When
referring to a parent corporation, the term "related corporation" shall mean
any corporation in an unbroken chain of corporations ending with the Company
if, at the time of the granting of the option, each of the corporations other
than the Company owns stock possessing 50% or more of the total combined voting
power of all classes of stock in one of the other corporations in such chain.

         5.9     DEATH OF OPTIONEE

         If an Optionee dies while he or she has a relationship with the
Company or any related corporation or within the three-month period (or
12-month period in the case of totally disabled Optionees) following cessation
of such relationship, any option held by such Optionee to the extent that the
Optionee would have been entitled to exercise such option, may be exercised
within one year after his or her death by the personal representative of his or
her estate or by the person or persons to whom the Optionee's rights under the
option shall pass by will or by the applicable laws of descent and
distribution.



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1993 Stock Option Plan
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         5.10    NO STATUS AS SHAREHOLDER

         Neither the Optionee nor any party to which the Optionee's rights and
privileges under the option may pass shall be, or have any of the rights or
privileges of, a shareholder of the Company with respect to any of the shares
issuable upon the exercise of any option granted under this Plan unless and
until such option has been exercised.

         5.11    CONTINUATION OF RELATIONSHIP

         Nothing in this Plan or in any option granted pursuant to this Plan
shall confer upon any Optionee any right to continue in the employ or other
relationship of the Company or of a related corporation, or to interfere in any
way with the right of the Company or of any such related corporation to
terminate his or her employment or other relationship with the Company at any
time.

         5.12    MODIFICATION AND AMENDMENT OF OPTION

         Subject to the requirements of Code Section 422 with respect to
incentive stock options and to the terms and conditions and within the
limitations of this Plan, the Plan Administrator may modify or amend
outstanding options granted under this Plan.  The modification or amendment of
an outstanding option shall not, without the consent of the Optionee, impair or
diminish any of his or her rights or any of the obligations of the Company
under such option.  Except as otherwise provided in this Plan, no outstanding
option shall be terminated without the consent of the Optionee.  Unless the
Optionee agrees otherwise, any changes or adjustments made to outstanding
incentive stock options granted under this Plan shall be made in such a manner
so as not to constitute a "modification" as defined in Code Section 425(h) and
so as not to cause any incentive stock option issued hereunder to fail to
continue to qualify as an incentive stock option as defined in Code Section
422(b).

         5.13    LIMITATION ON VALUE FOR INCENTIVE STOCK OPTIONS

         As to all incentive stock options granted under the terms of this
Plan, to the extent that the aggregate fair market value of the stock
(determined at the time the incentive stock option is granted) with respect to
which incentive stock options are exercisable for the first time by the
Optionee during any calendar year (under this Plan and all other incentive
stock option plans of the Company, a related corporation or a predecessor
corporation) exceeds $100,000, such options shall be treated as nonqualified
stock options to the extent required by Section 422 of the Code.



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Wall Data Incorporated                                                   Page 9
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SECTION 6.  GREATER THAN 10% SHAREHOLDERS

         6.1     EXERCISE PRICE AND TERM OF INCENTIVE STOCK OPTIONS

         If incentive stock options are granted under this Plan to employees
who own more than 10% of the total combined voting power of all classes of
stock of the Company or any related corporation, the term of such incentive
stock options shall not exceed five years and the exercise price shall be not
less than 110% of the fair market value of the Common Stock at the time the
incentive stock option is granted.  This provision shall control
notwithstanding any contrary terms contained in an option agreement or any
other document.

         6.2     ATTRIBUTION RULE

         For purposes of subsection 6.1, in determining stock ownership, an
employee shall be deemed to own the stock owned, directly or indirectly, by or
for his or her brothers, sisters, spouse, ancestors and lineal descendants.
Stock owned, directly or indirectly, by or for a corporation, partnership,
estate or trust shall be deemed to be owned proportionately by or for its
shareholders, partners or beneficiaries.  If an employee or a person related to
the employee owns an unexercised option or warrant to purchase stock of the
Company, the stock subject to that portion of the option or warrant which is
unexercised shall not be counted in determining stock ownership.  For purposes
of this Section 6, stock owned by an employee shall include all stock actually
issued and outstanding immediately before the grant of the incentive stock
option to the employee.

SECTION 7.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION

         The aggregate number and class of shares for which options may be
granted under this Plan, the Maximum Annual Optionee Grant set forth in Section
5.1, the number and class of shares covered by each outstanding option and the
exercise price per share thereof (but not the total price), shall all be
proportionately adjusted for any increase or decrease in the number of issued
shares of Common Stock of the Company resulting from a split-up or
consolidation of shares or any like capital adjustment, or the payment of any
stock dividend.

         7.1     EFFECT OF LIQUIDATION OR REORGANIZATION

                 7.1.1  CASH, STOCK OR OTHER PROPERTY FOR STOCK

         Except as provided in subsection 7.1.2, upon a merger (other than a
merger of the Company in which the holders of Common Stock immediately prior to
the merger have the same proportionate ownership of Common Stock in the
surviving corporation



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immediately after the merger), consolidation, acquisition of property or stock,
separation, reorganization (other than a mere reincorporation or the creation
of a holding company) or liquidation of the Company, as a result of which the
shareholders of the Company receive cash, stock or other property in exchange
for or in connection with their shares of Common Stock, any option granted
hereunder shall terminate, but the Optionee shall have the right immediately
prior to any such merger, consolidation, acquisition of property or stock,
separation, reorganization or liquidation to exercise such Optionee's option in
whole or in part whether or not the vesting requirements set forth in the
option agreement have been satisfied.

                 7.1.2  CONVERSION OF OPTIONS ON STOCK FOR STOCK EXCHANGE

         If the shareholders of the Company receive capital stock of another
corporation ("Exchange Stock") in exchange for their shares of Common Stock in
any transaction involving a merger (other than a merger of the Company in which
the holders of Common Stock immediately prior to the merger have the same
proportionate ownership of common stock in the surviving corporation
immediately after the merger), consolidation, acquisition of property or stock,
separation or reorganization (other than a mere reincorporation or the creation
of a holding company), all options granted hereunder shall be converted into
options to purchase shares of Exchange Stock unless the Company and the
corporation issuing the Exchange Stock, in their sole discretion, determine
that any or all such options granted hereunder shall not be converted into
options to purchase shares of Exchange Stock but instead shall terminate in
accordance with the provisions of subsection 7.1.1.  The amount and price of
converted options shall be determined by adjusting the amount and price of the
options granted hereunder in the same proportion as used for determining the
number of shares of Exchange Stock the holders of the Common Stock receive in
such merger, consolidation, acquisition of property or stock, separation or
reorganization.  The converted options shall be fully vested whether or not the
vesting requirements set forth in the option agreement have been satisfied.

         Upon a merger of the Company in which the holders of the Common Stock
immediately prior to the merger have the same proportionate ownership of common
stock in the surviving corporation immediately after the merger, a mere
reincorporation or the creation of a holding company, each option outstanding
under the Plan shall be assumed or an equivalent option shall be substituted by
the successor corporation or a parent or subsidiary of such corporation, and
the vesting schedule set forth in the instrument evidencing the option shall
continue to apply to such assumed or equivalent option.



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Wall Data Incorporated                                                  Page 11
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         7.2     FRACTIONAL SHARES

         In the event of any adjustment in the number of shares covered by any
option, any fractional shares resulting from such adjustment shall be
disregarded and each such option shall cover only the number of full shares
resulting from such adjustment.

         7.3     DETERMINATION OF BOARD TO BE FINAL

         All Section 7 adjustments shall be made by the Board, and its
determination as to what adjustments shall be made, and the extent thereof,
shall be final, binding and conclusive.  Unless an Optionee agrees otherwise,
any change or adjustment to an incentive stock option shall be made in such a
manner so as not to constitute a "modification" as defined in Code Section
425(h) and so as not to cause his or her incentive stock option issued
hereunder to fail to continue to qualify as an incentive stock option as
defined in Code Section 422(b).

SECTION 8.  SECURITIES REGULATION

         Shares shall not be issued with respect to an option granted under
this Plan unless the exercise of such option and the issuance and delivery of
such shares pursuant thereto shall comply with all relevant provisions of law,
including, without limitation, any applicable state securities laws, the
Securities Act of 1933, as amended, the Exchange Act, the rules and regulations
promulgated thereunder, and the requirements of any stock exchange upon which
the shares may then be listed, and shall be further subject to the approval of
counsel for the Company with respect to such compliance, including the
availability of an exemption from registration for the issuance and sale of any
shares hereunder.  Inability of the Company to obtain from any regulatory body
having jurisdiction, the authority deemed by the Company's counsel to be
necessary for the lawful issuance and sale of any shares hereunder or the
unavailability of an exemption from registration for the issuance and sale of
any shares hereunder shall relieve the Company of any liability in respect of
the nonissuance or sale of such shares as to which such requisite authority
shall not have been obtained.

         As a condition to the exercise of an option, the Company may require
the Optionee to represent and warrant at the time of any such exercise that the
shares are being purchased only for investment and without any present
intention to sell or distribute such shares if, in the opinion of counsel for
the Company, such a representation is required by any relevant provision of the
aforementioned laws.  At the option of the Company, a stop-transfer order
against any shares of stock may be placed on the official stock books and
records of the Company, and a legend indicating that the stock may not be
pledged, sold or otherwise transferred unless an opinion of counsel is provided
(concurred in by counsel for the Company) stating that



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Wall Data Incorporated                                                  Page 12
1993 Stock Option Plan
<PAGE>   13
such transfer is not in violation of any applicable law or regulation, may be
stamped on stock certificates in order to assure exemption from registration.
The Plan Administrator may also require such other action or agreement by the
Optionees as may from time to time be necessary to comply with the federal and
state securities laws.  THIS PROVISION SHALL NOT OBLIGATE THE COMPANY TO
UNDERTAKE REGISTRATION OF THE OPTIONS OR STOCK HEREUNDER.

         Should any of the Company's capital stock of the same class as the
stock subject to options granted hereunder be listed on a national securities
exchange, all stock issued hereunder if not previously listed on such exchange
shall be authorized by that exchange for listing thereon prior to the issuance
thereof.

SECTION 9.  AMENDMENT AND TERMINATION

         9.1     BOARD ACTION

         The Board may at any time suspend, amend or terminate this Plan,
provided that, to the extent required for compliance with Section 422 of the
Code or by any applicable law or regulation, the Company's shareholders must
approve any amendment which will:

                 (a)      increase the total number of shares that may be
issued under this Plan;

                 (b)      modify the class of participants eligible for
participation in this Plan; or

                 (c)      otherwise require shareholder approval under any
applicable law or regulation.

         Such shareholder approval must be obtained within 12 months of the
adoption by the Board of such amendment.

         Any amendment made to this Plan which would constitute a
"modification" to incentive stock options outstanding on the date of such
amendment, shall not be applicable to such outstanding incentive stock options,
but shall have prospective effect only, unless the Optionee agrees otherwise.

         9.2     AUTOMATIC TERMINATION

         Unless sooner terminated by the Board, this Plan shall terminate ten
years from the earlier of (a) the date on which this Plan is adopted by the
Board or (b) the date on which this Plan is approved by the shareholders of the
Company.  No option may be granted after such termination or during any
suspension of this Plan.  The amendment



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Wall Data Incorporated                                                  Page 13
1993 Stock Option Plan
<PAGE>   14
or termination of this Plan shall not, without the consent of the option
holder, impair or diminish any rights or obligations under any option
theretofore granted under this Plan.

SECTION 10.  EFFECTIVENESS OF THIS PLAN

         This Plan shall become effective upon adoption by the Board so long as
it is approved by a majority of stock represented by shareholders voting either
in person or by proxy at a duly held shareholders' meeting any time within 12
months before or after the adoption of this Plan.

Plan adopted by the Board of Directors on January 7, 1993 and approved by the
shareholders on January 28, 1993; Restated Plan adopted by the Board of
Directors on March 16, 1994 and approved by the shareholders on May 19, 1994.
Plan amended and restated by the Board of Directors on October 15, 1996.



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Wall Data Incorporated                                                  Page 14
1993 Stock Option Plan