EIM identifier
An EIM identifier represents a person or entity in an enterprise. A typical network consists of various hardware platforms and applications and their associated user registries. Most platforms and many applications use platform-specific or application-specific user registries. These user registries contain all of the user identification information for users who work with those servers or applications.
When you create an EIM identifier and associate it with the various user identities for a person or entity, it becomes easier to build heterogeneous, multiple-tier applications (for example, a single sign-on environment). When you create an EIM identifier and associations, it also becomes easier to build and use tools that simplify the administration involved with managing every user identity that a person or entity has within the enterprise.