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   tp_onhimark() - notify on high-water mark

   nNote := tp_onhimark(nPort, [cFunction])

   nPort       Serial port number.
   cFunction   Name of notification function.

   Returns     Notification handle.

   Requests notification when the input buffer of a given port fills up
   to the high-water mark.  If cFunction is omitted, deletes any
   onhimark notification request for that port.

   Example:

       tp_onhimark(1, "GetBlock")