System Role Properties (Management Studio)
Use the System Roles page to view the system role definitions that are currently defined for the report server. A system role definition contains a named collection of tasks that are performed relative to the entire site, instead of an individual item. Role definitions are assigned to a user or groups to create a resulting role assignment. The tasks in the role definition specify what the user or group can do.
Reporting Services has two predefined system role definitions: System Administrator and System User. You can modify these role definitions by changing the task list, or you can create a new system role that supports a different combination of tasks. Editing a role definition affects all role assignments that include the role definition.
System role assignments are used only on a report server that runs in native mode. If the report server is configured for SharePoint integration, this page is not available.