The Access Manager information tree contains information pertinent to system access. Each Access Manager instance creates and maintains a separate information tree in Sun Java System Directory Server. An Access Manager information tree can have any name (suffix). The Access Manager information tree includes realms (and sub-realms, if needed), as described in the following section.
A realm and any sub-realms are part of the Access Manager information tree and can contain configuration information that defines a set of users and/or groups, how users authenticate, which resources users can access, and the information that is available to applications after users are given access to resources. A realm or sub-realm can also contain other configuration information, including globalization configuration, password reset configuration, session configuration, console configuration, and user preferences. A realm or sub-realm can also be empty.
You can create a realm using either the Access Manager Console or the amadmin CLI utility. For more information refer to the Console online help or the Chapter 14, The amadmin Command Line Tool, in Sun Java System Access Manager 7 2005Q4 Administration Guide.