Setting up trust among multiple NT domains allows the users of one domain to use resources from another domain. The trusting domain trusts the trusted domain to manage users, groups, and resources. The trusting domain contains the resources that validated users need to access. Trust relationships aren't transitive. In other words, if the A domain trusts B, and B trusts C, A doesn't necessarily trust C. A domain's administrator must explicitly grant a trust to another domain to establish a trust relationship. Trust is one way; if A trusts B, B does not necessarily trust A.
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