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  Name:     islpt() - verify that an lpt port is in the system
  Usage:    <logical> = islpt([<port>])
  Params:   integer <port> - the port number to check for, optional,
            if left off then port #1 is assumed.
  Returns:  logical .T. if an lpt port present at <port>.

 ---------------------------------- Example ---------------------------------

                 if (! islpt(1))
                      ? "You need to buy a parallel printer port"
                 endif