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SettingExplanation
Realm A realm is a database of users with a specific name. Users can belong to multiple realms, but any given resource is protected by a single realm. For example, the administration and configuration resources are protected by the "admin" realm, whereas mail is setup by default to use another realm, named "mail".
Group Name The name of a group to which zero or more users belong. It may not contain a colon ":".
Member Name The name of a user or group defined in this realm.

It may not contain a colon ":"

Under UNIX, a user name is not necessarily the UNIX user name, although using the same name makes a lot of sense, especially when using the PowerWeb mail server.

Add a Group Define a new group, initially with no members.
Delete a Group Delete a group from the realm.
Add Member to Group The member may be either a group (in which case its name must be enclosed in square brackets "[]"), or a user name.
Delete Member from Group Remove the specified member from the specified group.
Find Groups Find all group names that match the given wildcard pattern.
Find Members Find all members that belong to the specified group.
Verify Group Name Verify that the group is defined in this realm.
Verify Member Name Verify that the member belongs to the given group in this realm. If the member name is a user name, then hierarchical groups are searched recursively to determine membership.