File and Directory Access Control Lists (ACLs)
Just to make sure we are all on the same page, an Access Control List (ACL)—pronounced in geek circles as “ackle”—is exactly what it sounds like. An ACL is a list of SIDs or Security Identifiers; these identifiers can belong to users, resources (such as a machine), and rights. Based on user accounts, this can include machine accounts, system accounts, files, and so on. Permissions and roles are established that determine what happens when an authenticated user makes a request. Just remember that it is quite difficult to authorize a user until that user has been authenticated so that you have an identity; otherwise, you're just authorizing the anonymous user.
In Windows 2000, the most familiar ACL ...
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