From this thread in the forums: http://www.jppf.org/forums/viewtopic.php?t=633
"Just to allow user on computing node monitor locally if is it working, allow him temporary disable node from computing network to maximize local performance.
This can be very simple application. Not as task monitor. (I think this is special extension than can be made by myself). Yes tray support (port from JDIC) is in JDK6."