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I know this is an old thread, but beware - if you hide all the Administrator accounts like that, you will essentially lock yourself out of being able to use the admin password in UAC popups.
Better...

I realize this thread is old, but it comes up near the top when googling this problem, so here's another link for anyone still researching it...

http://support.microsoft.com/kb/894278

I think Steve123 meant that signal is called a beacon.