This example shows the use of the WinQueryHelpInstance call during the processing of a WM_INITMENU message in order to obtain the handle for sending an HM_SET_ACTIVE_WINDOW message.

#define INCL_WIN
#include <os2.h>

MRESULT wm_initmenu( HWND hWnd, ULONG ulMsg, MPARAM mp1, MPARAM mp2 )
{
   /* Send message to establish the current window's parent      */
   /* as the active help window.                                 */
   WinSendMsg( WinQueryHelpInstance( hWnd ),
               HM_SET_ACTIVE_WINDOW,
               (MPARAM)WinQueryWindow( hWnd, QW_PARENT ),
               (MPARAM)WinQueryWindow( hWnd, QW_PARENT ) );

   /* Pass message on for default processing                     */
   return WinDefWindowProc( hWnd, ulMsg, mp1, mp2 );
}