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Logging On

One of the fundamental concepts of the Windows 2000 security model is the idea that a user must log on to a Windows 2000 computer before accessing any of its resources. By enforcing a mandatory logon, Windows 2000 prevents unauthorized users from accessing the system and can prevent authorized users from having more access than the computer's administrator wants them to.

Once logged on, the computer knows who the user is and can then provide or deny access as appropriate. In a Domain environment, access to resources can be allowed or denied to any security principal in the Domain—where a security principal is a either a user or a machine.


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