Thanks. But what if it is not under the same domain but on the same subnet or local LAN, would this still be possible?
Yes. In this case you must know the administrator password on the remote machine, and the password must not be empty.
Also, if it's an XP remote machine, you should disable 'Simple file sharing' feature. If it's a Win 7 remote machine, the UAC (User Access Control) for network connections must be disabled.