When adding a user entry to the user repository for a broker instance, you can specify one of three predefined groups: admin, user, or anonymous. If no group is specified, the default group user is assigned. Groups should be assigned as follows:
user group. For normal (non-administration) Message Queue client users. Most client users are in the user group. By default, users in this group can produce messages to all topics and queues, consume messages from all topics and queues, and browse messages in any queue.
anonymous group. For Message Queue clients that do not want a user name that is known to the broker, possibly because the client application does not know of a real user name to use. This account is analogous to the anonymous account present in most FTP servers. You can assign only one user at a time to the anonymous group. You should restrict the access privileges of this group as compared to the user group or you should remove users from the group at deployment time.
You cannot rename or delete these system-created groups, or create new groups. However, you can specify access rules that define the operations that the members of that group can perform. For more information, see User Authorization: The Access Control Properties File.