It is possible to create another parent domain in Active Directory and create objects under it that may appear identical to objects in adjacent domain trees. These collections of domain trees are called forests. Active Directory refers to a single domain tree as a forest of one tree. You can also set up trust relationships between these trees, and allow users of one tree in the forest to access the resources in another tree. You would find yourself adding trees to your forest, for example, when you acquire another IT department in a corporate takeover or merger, or when migrating objects from one domain to another, or integrating with legacy NT domains.
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