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CombineRgn           Make new region from two existing regions

short CombineRgn(hDestRgn, hScrRgn1, hScrRgn2, nCombineMode)
HRGN hDestRgn;
HRGN hScrRgn1;
HRGN hScrRgn2;
short nCombineMode;


        Combine region is one item from each column or'd (|) together:

             Resulting Type                      Operation
 |-------------------------------------+------------------------------------|
 | ERROR          None created         | RGN_AND   Overlapping only         |
 | NULLREGION     New is empty         | RGN_OR    Union                    |
 | SIMPLEREGION   No overlapped borders| RGN_XOR   Union except overlapping |
 | COMPLEXREGION  Overlapped borders   | RGN_DIFF                           |
 |                                     | RGN_COPY  Copy region1             |
 +--------------------------------------------------------------------------+