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   tp_ctrlcts() - get or set CTS handshake setting

   nOldCtrl := tp_ctrlcts(nPort, [nNewCtrl])

   nPort       Serial port number.
   nNewCtrl    New CTS control setting.

   Returns     Original CTS control setting.

   Gets or sets the CTS handshake setting.  This setting may be one of:

       0   Ignore CTS.
       1   Require CTS to output characters.

   If nNewCtrl is omitted, tp_ctrlcts() just returns the current
   setting.  If nNewCtrl is specified, it changes the setting and
   returns the original value.

   The default setting when a port is opened is 0.

   Example:

       tp_ctrlcts(1, 1)    // Enable CTS handshake on port 1.