sever is java app which is run as separate process on separate pc (its possible to run it on the same pc, but its senseless). not sure about auto-dj, maybe its possible to source auto-dj from subsonic node, i don't remember. subsonic node will look in mb somewhat like a mobile device connected to mb with ability to play music from it. don't remember, but this 'device' probably will be read-only, ie you must setup monitored folders on the server, not in mb.