Offline Domain Join
Since Windows NT4, client machines have been able to join Windows domains as long as a direct connection to the domain controller was present.
With Windows 7 and Windows Server 2008 R2, there is now a way to join an offline client to a domain.
A new program called djoin.exe has been introduced
to perform this task.
Like previous versions of Windows, joining a domain is only available on Professional, Enterprise, and Ultimate
editions.
More: VPN Reconnect, Windows Connect Now, indows Mobility Center