This example uses WinFlashWindow to flash an inactive window to draw the user's attention to an important message in the window.

#define INCL_WINFRAMEMGR        /* Window Frame Functions       */
#define INCL_WINDIALOGS         /* Window Dialog Mgr Functions  */
#include <os2.h>

BOOL  fSuccess;         /* Success indicator                    */
HWND  hwnd;             /* window handle                        */

/* flash window to get user's attention */
fSuccess = WinFlashWindow(hwnd, TRUE);

/* vital message is displayed */
WinMessageBox(HWND_DESKTOP,
    hwnd,                      /* client-window handle   */
    "Important message: must be seen by user",/* message */
    "Vital message",           /* title of the message   */
    0,                         /* message box id         */
    MB_NOICON | MB_OK);        /* icon and button flags  */