Domain Names of User Repositories
Each user repository is uniquely identified by a domain name. A user in a user repository is uniquely identified by the combination of domain name and user name.
When you log in to CentraSite Control, you must supply the name of a domain in which you are registered and your user name, in the format <DomainName>\<UserName> , for example, Headquarters\JSmith.
The domain name for an authentication configuration of type Internal is always INTERNAL. Since this name is fixed, there can be only one such configuration defined per instance of the CentraSiteregistry.