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  Argument
 
    action    _GAND, _GOR, GPRESET, _GPSET, or _GXOR
 
  Description
 
    The _SetWriteMode procedure sets the logical write operation to be
    used when drawing lines. _GPSET (the default) causes lines to be
    drawn in the current graphics color. _GXOR performs a logical
    exclusive OR operation with the original screen image. The values
    _GAND, _GOR, and _GPRESET specify other logical operations. See
    the _PutImage help entry for more details on these logical
    operations.
 
    In QuickPascal 1.0, the _SetWriteMode function affects lines drawn
    with the _LineTo and _Rectangle procedures only.
 
  _GrStatus Returns
 
    _GrInvalidParameter, _GrNotInProperMode