Group Policy application rules for domain controllers

Domain controllers pull some security settings only from group policy objects linked to the root of the domain. Because domain controllers share the same account database for the domain, certain security settings must be set uniformly on all domain controllers. This ensures that the members of the domain have a consistent experience regardless of which domain controller they use to log on. Windows 2000 accomplishes this task by allowing only certain setting in the group policy to be applied to domain controllers at the domain level. This group policy behavior is different for member server and workstations.

ripped from : http://support.microsoft.com/kb/259576/en-us#appliesto

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