UI Automation Events In standard Windows GUI code, you can respond to Windows messages by registering and implementing a message handler function. A WM_NOTIFY message handler is registered and implemented in this way: ; Registration GUIRegisterMsg( $WM_NOTIFY, "WM_NOTIFY" ) ; Implementation Func WM_NOTIFY( $hWnd, $iMsg, $wParam, $lParam ) ; Code EndFunc The WM_NOTIFY function is a callback function. In UI Automation code, you can respond to UI Au