You can use Active Directory Domains and Trusts to manage domain trusts.
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Understanding Trusts
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Understanding Trust Types
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Understanding Trust Direction
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Understanding Trust Transitivity
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Understanding When to Create an External Trust
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Understanding When to Create a Shortcut Trust
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Understanding When to Create a Realm Trust
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Create a Shortcut Trust
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Create an External Trust
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Create a Realm Trust
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Verify a Trust
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Remove a Trust
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Select the Scope of Authentication for Users