I need to take a running windows desktop box that's part of a domain, give it a new computer name, and then continue working on it (with the box having the new name), without having to reboot at all.

Since starting work at my new place (though after almost 8 months it's not 'new' anymore) my first priority was to get the desktops in order. We now have a standard build (that takes 2 hours rather ...