ReadComm( nIdComm, @cBuffer )-> <nBytesRead>
------------------------------------------------------------------------------


 PARAMETER:

  <nIdComm>     Is the numeric identifier for the opened device, or zero if
                an error occured

  <cBuffer>     Is a string variable supplied by reference, where the
                incomming bytes are stored. The lenght of the buffer also
                specifies the number of bytes that are read. You can use the
                SPACE( n ) function to initialize this buffer.


 RETURNS:

  <nBytesRead> is the number of bytes read, or zero if an error occured.



 DESCRIPTION:

  ReadComm() reads up to a specified number of bytes from the given
  communications device. When an error occurs, the cause of the error can be
  determined by using GetCommError to retrieve the error code. Since
  errors can occur when no bytes are present, if the return value is zero,
  the GetCommError function should be used to ensure that no error occurred. 
  Please see the SAMPLES\TestComm.prg file for a working sample.


 SOURCE:

  SOURCE\WINAPI\COMM.C