The Identity Manager is a core framework feature. As the name implies it keeps record of user and groups identities and manages access credentials.
The Identity Manager is a pluggable framework module. There are several implementations available, namely:
Soon it will be available a proprieatary DB-based implementation for users with no identity manager compatibility issues. It's aimed at small enterprise and B2C web sites.
The Identity Manager offers the following features:
The complete Identity Manager interface can be inspected here.
The user guide shows examples on how to use the identity manager.
The objects used by the framework and by the identity manager to store the relevant data are described here.