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   tp_getwatch() - find an activated input watch

   nWatch := tp_getwatch()

   Returns     Watch handle.

   Checks to see if any input watches have matched.  If any have, it
   returns the handle of one of them, and decrements that one's match
   count.  The watch handle is the number returned by the tp_watch()
   function call that set the watch.

   If several watches have matched, the order in which they are returned
   by tp_getwatch() is not the order in which they were received.

       nXmodem := tp_getwatch(1, "Start your Xmodem download now")
           // Watch for Xmodem download (for some imaginary BBS).

       nZRQINIT := tp_getwatch(1, "*" + chr(24) + "B00")
           // Watch for Zmodem auto-download request.

       do while .T.
           ...process some data...
           nWatch := tp_getwatch()
           do case
           case nWatch == nXmodem
               tp_rxmodem(1, "C:\DOWN\XFILE")
           case nWatch == nZRQINIT
               tp_rzmodem(1, "C:\DOWN")
           endcase
       enddo