If you want to run different exe's on different comps, you just change the address in the setup files to the ip of the comp where the exe it refers to is running.
If you want to split your game server over 2 comps because your comps are too slow or low on ram, you gotta add the second comp's ip in !servertable.txt (on both comps) with the index 1 (the main comp should be index 0), then go to !setup.txt and change ventureserver=false to true and edit serverindex (0 on first comp, 1 on second), then change all IPs to point the main comp (or whatever comp the corresponding exe's are running on).