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   tp_flush() - flush output buffer

   nError := tp_flush(nPort, [nTimeout])

   nPort       Serial port number.
   nTimeout    Port timeout, default -1.

   Returns     Error code.

   Waits until the output buffer is empty.  nTimeout is the maximum
   number of seconds to wait, up to 1800 seconds, or -1 to wait forever.

   Example:

       tp_send(1, "Logged off at " + time() + chr(13) + chr(10))
       tp_flush(1, 10)     // Wait till message sent....
       HangupModem()       // ...before hanging up.