The easiest way is to edit your domain GPO under Computer
Configuration\Windows Settings\Security\Local Policies\Security Options. In
there you'll find a setting that controls the messages box that comes up (if
configured) when you press ctrl-alt-del. Unfortunately I don't remember the
name of the setting, but I'm sure you'll find it.
Or you could do it the hard way with Regini from the Resource Kit and write
a script that changes the appropriate registry settings. Regini runs the
scripts you write that add and modify registry subkeys and entries.
Display a Legal notice caption that appears when they press ctrl-alt-delete:
Hive: HKEY_LOCAL_MACHINE\SOFTWARE
Key: \Microsoft\Windows NT\Current Version\Winlogon
Name: LegalNoticeCaption
Type: REG_SZ
Value: Whatever you want for the title of the message box
Hive: HKEY_LOCAL_MACHINE\SOFTWARE
Key: Microsoft\Windows NT\Current Version\Winlogon
Name: LegalNoticeText
Type: REG_SZ
Value: Whatever you want for the text of the message box
Regards,
/Jimmy