FlushComm( nIdComDev, nQueue )-> <nReturn>
------------------------------------------------------------------------------


 PARAMETER:

  <nIdComDev>   Identifies the communication device to be flushed. This is
                the value returned by OpenComm()

  <nQueue>      Specifies the queue to be flushed. If this parameter is
                is zero, the transmission queue is flushed. If the parameter
                is one, the receiving queue is flushed.


 RETURNS:

  <nReturn> is zero if the function is successful. If it is less than zero
  then <nIdComDev> is not a valid device or <nQueue. is not a valid device.
  The return value is positive if there is an error for the specified
  device. For a list of the possible error values, see GetCommError()


 DESCRIPTION:

  This function flushes all characters from the transmission or receiving
  queue of the specified communications device. See SAMPLES\TestComm.prg for
  an example of the communication functions

 SOURCE:

  SOURCE\WINAPI\COMM.C