The following code illustrates how to cause modal WinProcessSecondaryWindows or WinSecondaryWindow calls to return.

 #define INCL_SW
 #include <os2me.h>

 case WM_COMMAND:
    switch (SHORT1FROMMP(mp1)) {
       case DID_CANCEL:
          /* Dismiss the window  */
          WinDismissSecondaryWindow (hwnd, DID_CANCEL);
          break;
    }