21Jun/090
Display a Text Message On Your Windows Vista Logon Screen
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You can put a notice on your Windows Vista logon screen so that each time when your PC is booted up, it displays a notice to the person who boot up the PC. You can put two lines of text: the caption and the message that describes the caption.
To put the text on Windows Vista logon screen, you will need to edit your Windows' registry entries.
- Press Windows Key + R to bring up "run" window. Type in
regeditto start Windows registry editor. - In registry editor, navigate the tree on the left to
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System. - On the right pane, double click
legalnoticecaptionand type in the text that you want to put it as caption. Click Ok to apply the changes. - On the right pane, double click
legalnoticetextand type in the text that you want to put it as message.Click Ok to apply the changes. - Exit registry editor and Log off to see the changes.

Note: You can also use Start -> All Programs -> Administrative Tools -> Local Security Policy to edit the text message but this option is only available in Windows Vista Business and Enterprise editions.
[via The Windows Club]