When it's time to bid farewell to your computer for some time, it's advisable to logoff to secure your computer against unauthorized access.
UP TO SPEED : Active Directory
On a network driven by Windows 2000 Server, the various Windows 2000 network entities, such as domains, trees, and forests, are listed, organized, and maintained in a centralized database on your network called the Active Directory. The average Windows 2000 Professional user may not even be aware of Active Directory, but it's the single most important new feature of Windows 2000 Server. It's a directory service, a database of the hardware, software, and people on a network.
On a network that uses Active Directory, every computer, printer, and user is represented by an object in the database. Each object is composed of attributes (properties) that describe it. For example, a user object's attributes specify her name, location, telephone number, email address, and other more technical elements.
Active Directory enables network administrators to create, troubleshoot, and maintain an enormous hierarchy of computers, if necessary, encompassing virtually any number of users, computers, and domains. Windows 2000 Server configures relationships between the domains automatically. A multinational corporation with tens of thousands of users in offices all over the world can all be part of one Active Directory, consisting of servers distributed in hundreds of locations, all connected by wide-area networking links. ...
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