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CallWindowProc      Call window procedure with message to be processed

long CallWindowProc(lpPrevWndFunc, hWnd, wMsg, wParam, lParam)
FARPROC lpPrevWndFunc; /* returned by GetWindowLong */
HWND hWnd;
unsigned wMsg;
WORD wParam;
LONG lParam;


Returns:    Depends on function.

Note:       Used with sub-classing.