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                                                                    EXHIBIT 99.4


                               AMENDMENT NO. 4 TO
                             WALL DATA INCORPORATED
                        1994 NONOFFICER STOCK OPTION PLAN
                   AS AMENDED AND RESTATED ON OCTOBER 15, 1996

        The Wall Data Incorporated 1994 Nonofficer Stock Option Plan (the
"Plan") is amended as follows:

        1.      Section 3 of the Plan is amended to read as follows:

        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 6,
        the aggregate amount of Common Stock to be delivered upon the exercise
        of all options granted under this Plan shall not exceed 1,585,000 shares
        of Common Stock. 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.



        The date of the adoption of this Amendment No. 4 by the Board of
Directors of the Company is December 1, 1998. The effective date of this
Amendment No. 4 shall be December 1, 1998, the date of adoption by the Board of
Directors.