realm

The realm is a string that uniquely identifies an editor and how they edited the data. Realms can be used to differentiate edits made through a feature service as opposed to those made directly to the data in the geodatabase. If a realm string is present, it is appended to the username using the "@" character. For example, a realm string of "denver" is appended to the user "John" to give a user name of "John@denver". For more information, see Configure a realm for a feature service.