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Sometimes the UD Agent's tray icon disappears even when it is actually running as your own username. This may cause you to not be able to double-click the Agent and see its progress, which makes you have to abort it with Task Manager (sometimes causing you to lose some time that your computer has spent working). This utility will broadcast a message that says "Microsoft Explorer restarted" to the UD Agent, which causes it to redraw its icon in the system tray.
You can find more info on this here
Submitted by lilhurricane .