Added this entry to the file: <menuitem priority="5" name="RebootX"> <callback service="com.nokia.xterm" path="/com/nokia/xterm" interface="com.nokia.xterm" method="run_command" bus="session" autostart="true"> <argument type="string">/sbin/reboot</argument> </callback> </menuitem> There is now a button RebootX but all is seems to do is start an xterm window, close it and start another one. I think the command needs root privileges...