Globally Unique Service Identifiers!
		ü The very first time a service registers with a lookup service, it is assigned an ID ü ID is globally unique ü Service is required to remember forever ü 60 of the 128 bits express the current system time in 100 ns increments since 1582 ü Remainder is random – 295,147,905,179,352,825,856 choices… ü Allows clients to determine if services registered at different lookups are the same ü Allows lookup servers to notice duplicate registrations