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The screen saver for the hidden account is set to the "Windows XP" screen saver with "On resume, display Welcome screen" checked.
At Hide user accounts from the Windows XP Welcome screen, one can download a tool that makes it easy to hide and unhide accounts. The webpage also mentions that the Ctrl-Alt-Del trick for logging into hidden accounts has a a pitfall - "it will fail to work if a user is still currently logged in."
If I hit Ctrl-End, the cursor is placed in the passwod field for one of the visible accounts, but hitting Ctrl-Alt-Del at that point has no effect and I can't get back into the logged in account.
I've found I can get around this problem by logging into one of the visible accounts and then immediately logging off that account. If I then hit Ctrl-Alt-Del a couple of times, I get the "Log On to Windows" user name and password prompt and can regain access to the hidden account under which I'm already logged in.
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