Notifies a graphics mode application when it must save or redraw its screen image.
#define INCL_VIO
#include <os2.h>
ULONG SaveRedrawIndic; /* Save/redraw indicator. */
PULONG NotifyType; /* Notify type (returned). */
HVIO VioHandle; /* Reserved. Must be 0. */
APIRET rc; /* Return code. */
rc = VioSavRedrawWait(SaveRedrawIndic, NotifyType,
VioHandle);