Another hit:
http://www.windowsitpro.com/Article/ArticleID/47605/47605.html

So it seems since the binary HKCU value is already loaded into memory when the user logs in, and written back from there when logging out, it has to be written either when the user's logged off into the HKEY_USERS\-GUID- section, or put as a startup/run once thing before the user logs on.

Edited by masken (2006-02-01 10:04 PM)
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The tart is out there