The following code illustrates processing a modal secondary window by dispatching messages while the modal window is displayed.

 #define INCL_SW
 #include <os2me.h>

 HWND hwndFrame;

 hwndFrame = WinLoadSecondaryWindow (HWND_DESKTOP, /* Parent window */
                                     HWND_DESKTOP, /* Owner window  */
                                     MyDlgProc,    /* Dialog proc   */
                                     NULL,         /* Module handle */
                                     ID_DIALOG,    /* Resource ID   */
                                     NULL);        /* Create params */
 WinProcessSecondaryWindow (hwndFrame);