This example uses WinFocusChange to change the focus to the selected window, using the handle returned by WinQueryFocus.

#define INCL_WININPUT           /* Window Input Functions       */
#include <os2.h>

HWND  hwndNewFocus;     /* Handle of new focus window           */
BOOL  fSuccess;         /* success indicator                    */
MPARAM  mpParam1;       /* Parameter 1 (select boolean)         */

case WM_SETSELECTION:
     /* if window is being selected, change focus to the window */
     if (SHORTFROMMP(mpParam1))
        {
        if ((hwndNewFocus =
             WinQueryFocus(HWND_DESKTOP)) != 0L)
           fSuccess = WinFocusChange(HWND_DESKTOP, hwndNewFocus,
                                     0L);
        }