plxormod: Enter or leave xor mode

`plxormod`: Enter or leave xor mode
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#### `plxormod`: Enter or leave xor mode

`plxormod (` | mode ,
| status `)`;

Enter (when ``mode`` is true) or leave (when ``mode`` is false) xor mode for those drivers (e.g., the xwin driver) that support it. Enables erasing plots by drawing twice the same line, symbol, etc. If driver is not capable of xor operation it returns a ``status`` of false.

`mode` (``PLBOOL``, input)

  ``mode`` is true means enter xor mode and ``mode`` is false means leave xor mode.

`status` (``PLBOOL_NC_SCALAR``, output)

  Returned value of the status. ``mode``status of true (false) means driver is capable (incapable) of xor mode.

Redacted form: `plxormod(mode, status)`

This function is used in examples 1 and 20.

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