The Data Store authentication module allows a user to authenticate against one or more of a realm's identity data stores (depending on the authentication process configuration). This authentication module is enabled after installation to authenticate to the identity data store configured for the top level realm during installation. Depending on the deployment, this might be the embedded configuration data store (for user storage in sample deployments) or a defined external data store (for user storage in real world deployments). If you change the identity data store definition for the top level realm, the Data Store authentication module adapts to the modified data store definition. After installation, additional identity data stores can be added to the top level or sub realms and configured for Data Store authentication. The Data Store authentication module extends the com.sun.identity.idm.IdRepo interface. You can include or remove a configured data store from identity authentication by unchecking User in the Identity Types That Can Be Authenticated attribute in the Data Store profile. For more information on the Data Store authentication module attributes, see Data Store in Sun OpenSSO Enterprise 8.0 Administration Reference.