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   tp_rxcrc() - receive file using Xmodem/CRC

   nError := tp_rxcrc(nPort, cFile, [cProgress)

   nPort       Serial port number.
   cFile       File name.
   cProgress   Progress function name.

   Returns     Error code.

   Receives a single file using Xmodem/CRC protocol.  See File Transfers
   for more details.

   Example:

       nError := tp_rxcrc(1, "C:\DOWN\TEMP.DBF", "Progress")
       // Examples of progress functions may be found in the files
       // PROGRESS.PRG, RZ.PRG, SZ.PRG, TRANSFER.PRG, TRAN2.PRG,
       // and TRAN3.PRG, in the Telepathy sample code directories.