Configuration information for a given Application Server domain is stored in a central repository that is shared by all instances in that domain. The central repository can only be written to by the DAS. However, configuration information in the central repository is made available to administration clients via AMX MBeans.
The configuration MBeans are those that modify the underlying domain.xml or related files. Collectively, they form a model representing the configuration and deployment repository and the operations that can be performed on them.
The Group Attribute of configuration MBeans, obtained from getGroup(), has a value of com.sun.appserv.management.base.AMX.GROUP_CONFIGURATION.