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SET_XOR()                                                           G_EXAM08
   Toggles line drawing to be XORed to the background.

   Syntax
         nOnOrOff = SET_XOR([nOnOrOff])

   Arguments
         OPTIONAL PARAMETERS
         nOnOrOff    Sets whether XOR is on or off
                     0 - XORing OFF [Default], 1 - XORing on

   Returns
         nOnOrOff    Returns whether XOR is on or off.
                     0 - XORing OFF, 1 - XORing on

   Description
         Toggles line drawing, and point setting to be drawn as XOR to the
         background. When XORing is on, the same line or text can be drawn
         again and it will erase the first without changing the underlying
         image.