.
	.
	. Application Event Loop
	.
	case WM_REDRAW:
			RedrawWindow( msg[3], (GRECT *)&msg[4] );
			break;
	.
	.


VOID
RedrawWindow( WORD winhandle, GRECT *dirty )
{
	GRECT rect;

	wind_update( BEG_UPDATE );
	
	wind_get( winhandle, WF_FIRSTXYWH, &rect.g_x, &rect.g_y, &rect.g_w, 
			&rect.g_h);
	while( rect.g_w && rect.g_h )
	{
		if( rc_intersect( dirty, &rect ) )
		{
			/*
			 * Do your drawing here...constrained to the rectangle in g.
			 */
		}

		wind_get( winhandle, WF_NEXTXYWH, &rect.g_x, &rect.g_y, &rect.g_w, 	
				&rect.g_h);
	}

	wind_update( END_UPDATE );
}