NAME
    IND_SETMTRIG -- Set the conditions for a mouse port report

FUNCTION
    This command sets what conditions must be met by a mouse
    before a pending Read request will be satisfied.  The trigger
    specification is that used by the gameport device.

IO REQUEST
    io_Message      mn_ReplyPort set if quick I/O is not possible
    io_Device       preset by the call to OpenDevice
    io_Unit         preset by the call to OpenDevice
    io_Command      IND_SETMTRIG
    io_Flags        IOB_QUICK set if quick I/O is possible
    io_Length       sizeof(gameportTrigger)
    io_Data         a structure of type GameportTrigger, which
                    has the following elements
        gpt_Keys -
                GPTB_DOWNKEYS set if button down transitions
                trigger a report, and GPTB_UPKEYS set if button up
                transitions trigger a report
        gpt_Timeout -
                a time which, if exceeded, triggers a report;
                measured in vertical blank units (60/sec)
        gpt_XDelta  -
                a distance in x which, if exceeded, triggers a
                report
        gpt_YDelta  -
                a distance in x which, if exceeded, triggers a
                report