tp_symodem() - send files using Ymodem or Ymodem-G

   nError := tp_symodem(nPort, cFile|acFiles, [cProgress])

   nPort       Serial port number.
   cFile       File name.
   acFiles     Array of file names.
   cProgress   Progress function name.

   Returns     Error code.

   Sends one or more files using Ymodem or Ymodem-G protocol.  You may
   specify either the name of a single file, or an array of file names.
   See File Transfers for more details.

   Example:

       nError := tp_symodem(1, "C:\UP\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.