A first computer sends a request to the second computer to access the application. The second computer determines that the user has not yet been authenticated to the application. The second computer redirects the request to a third computer. The third computer determines that the user has been authenticated to the third computer. The third computer authenticates the user to the application. The second computer returns a session key to the third computer for a session between the application and the user. The session has a scope of the second computer or the application but not a scope of a domain. The third computer generates another session key with a scope of the domain and sends the domain-scope session key to the first computer.