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   tp_error() - error code from last operation

   nError := tp_error()

   Returns     Error code.

   Returns the error code from the last operation performed.  This code
   is a numeric value that identifies the error.  If there was no error,
   the value returned is zero.  All possible error codes are listed in
   the Error Codes section.

   Example:

       cLine := tp_recvln(1)           // Read a line of input.
       if tp_error() <> 0              // Error during input?
           return                      // Yes - cancel operation.
       endif