NAME
        IND_SETTHRESH -- Set the key repeat threshold

   FUNCTION
        This command sets the time that a key must be held down before
        it can repeat.  The repeatability of a key may be restricted
        (as, for example, are the shift keys).

        This command always executes immediately.

   IO REQUEST - a timerequest
        tr_node.io_message      mn_replyport set if quick i/o is not possible
        tr_node.io_device       preset by the call to opendevice
        tr_node.io_unit         preset by the call to opendevice
        tr_node.io_command      ind_setthresh
        tr_node.io_flags        iob_quick set if quick i/o is possible
        tr_time.tv_secs         the threshold seconds
        tr_time.tv_micro        the threshold microseconds