Directory Services

U

universal group
A group that can contain members from any domain and can be granted permissions to resources in any domain in the current domain forest.
update sequence number
A type of identifier that is used to control replication between domain controllers in Microsoft Windows 2000 and Windows Server 2003 family operating systems.
UPN
See user principal name.
user principal name
A logon name type of a user on a Microsoft Windows 2000 or Windows Server 2003 network. The user principal name consists of the user object name used in Active Directory, followed by the at symbol (@) and then, typically, the Domain Name System parent domain. For example, JeffSmith in the Fabrikam.com domain tree might have the user principal name jeffsmith@fabrikam.com.
USN
See update sequence number.