If u try join your own novawold server by Lan cable (without using your always too slow internet connexion), u will have an error message (incorrect key receive from the server...or something like that)
You receive the correct key by novaworld in the short laps of time before starting loading the map......dont need to load the map...just go back and join by LAN IP...the key will remain until you close Comanche 4 or if the server reboot.

but i didnt tryed if it work with many PC with the same Nova login info