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The Security Subsystem

We made a couple of references to the security subsystem in the context of extensibility earlier in the chapter. Like the environment subsystems, another class of systems called integral subsystems offers services to the NT kernel, and the security subsystem is one of them. Like the environment subsystems, the security subsystem runs in user mode, and its job is, as the name implies, to provide security for the operating system. All transactions within the operating system and with outside forces (typically people) that have been deemed by Windows 2000's programmers to be potentially "life" threatening to the system are observed or controlled in one way or another by the security subsystem.

An obvious job of the security subsystem would be to prevent unauthorized use of files or hard disk volumes without correct password (assuming passwords were required to access that resource). Any user who hasn't been granted the requisite rights will be bounced at the door.


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