Support for a Kerberos based Network Authentication Service and the introduction of Enterprise Identity Mapping (EIM) were exciting OS/400® V5R2 announcements during 2002.
O. Medelyan, and I. Witten. JCDL '06: Proceedings of the 6th ACM/IEEE-CS joint conference on Digital libraries, page 296--297. New York, NY, USA, ACM, (2006)