s.setChildItem(Signal.LANGUAGE, Signal.GUI_LANGUAGE); s.setChildItem(Signal.OBJECT, getChildItem(Controller.SYSTEM_USER_INTERFACE));
s.setChild(Signal.LANGUAGE, Signal.GUI_LANGUAGE); s.setChild(Signal.OBJECT, getChild(Controller.SYSTEM_USER_INTERFACE));
    protected void hideSystemUserInterface(Signal s) throws Exception {        if (s != null) {            s.setChildItem(Signal.LANGUAGE, Signal.GUI_LANGUAGE);            s.setChildItem(Signal.OBJECT, getChildItem(Controller.SYSTEM_USER_INTERFACE));        } else {            throw new Exception("Could not hide system user interface. The signal is null.");        }    }