In some situations, you may want to add a security warning to Windows NT that users will see before they log in. Doing so is an easy task, but it does require editing the registry.
To create a security warning, follow these steps:
The next time you or a user logs in, Windows NT will display the security warning before letting you log in.
Note: Editing the registry is risky, so be sure you have a verified backup before making any changes.