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SetClassWord         Set Word Value Into Window Structure

WORD SetClassWord(hWnd, nIndex, wNewWord)
HWND hWnd;
int nIndex;
WORD wNewWord;

                nIndex
        |----------------------------------------------|
        |GCW_CBCLSEXTRA    Additional Window Class Info|
        |GCW_CBWNDEXTRA    Additional Window Info      |
        |GCW_HBRBACKGROUND Handle to background brush  |
        |GCW_HCURSOR       Handle of cursor            |
        |GCW_HICON         Handle of icon              |
        |GCW_HMODULE       Handle of module            |
        |GCW_STYLE         Style bits                  |
        |Offset            Of cbClsExtra bytes         |
        +----------------------------------------------+

Returns:    Previous word from window structure.