For an operating system, it is essential to provide both effective and extendable security to its resources. Two of the forerunners in this area are Microsoft Windows NT and Microsoft Windows 2000. What features of Windows NT/2000 make it possible to have a flexible and extendable security? What should be done to make a Windows NT/2000 system use a different access mechanism in place of the default password authentication method? This paper addresses these questions.
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