Computers How To Set Up A Computer Network For Three Computers?

How to set up a computer network for three computers? - computers

We have 3 computers at work and we try to contact all together, so that we can change the primary server and the other two files, you can dump. It's okay if they are all open, because we are in a secure network. To the extent that you can export files in any of the other computer. A team is running Vista and the other two are Windows XP. Any help would be very grateful. Thank you.