## Presentation Device Driver Reference for OS/2

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### GreCombineRegion Parameter - cmdMode

cmdMode (LONG) - input Method of combination.

CRGN_OR Union of hrgnSrc1 and hrgnSrc2.
CRGN_COPY Uses hrgnSrc1 only. hrgnSrc2 is ignored.
CRGN_XOR Symmetric difference of hrgnSrc1 and hrgnSrc2.
CRGN_AND Intersection of hrgnSrc1 and hrgnSrc2.
CRGN_DIFF Uses hrgnSrc1 and not (hrgnSrc2).