## Presentation Device Driver Reference for OS/2

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### GreCombineRectRegion Parameter - cmdMode

cmdMode (LONG) - input Method of combination.

CRGN_OR Union of hrgnSrc and prclRect.
CRGN_COPY Uses prclRect only. The hrgnSrc parameter is ignored.
CRGN_XOR Symmetric difference of hrgnSrc and prclRect.
CRGN_AND Intersection of hrgnSrc and prclRect.
CRGN_DIFF Uses hrgnSrc and not (prclRect).