you dont need any scripts if you are gonna box on 1 PC, just get Keyclone software. Easy to make it work.

Also you can split screen windows with WoWs running different accounts but you dont have to. You can minimize of of windows for example and make other char follow your main, assisting him in whatever he does.

If you want 2 computers, I am not sure but I think you need router or something to connect PCs and then use some kind of software (keyclone/synergy for example) to send keystrokes from main PC to "slave".