Re: Security Problem
Since you're talking about physically moving computers and the effect that causes on networking, I have to assume you are talking about wireless networking. So it sounds like the problem is that you have 18 wireless computers competing for connections in a small space. That sounds like an RF or radio interference problem, not a networking problem.
If you shutdown all machines but one (or disable their wireless adapters) can it connect? If you rotate through all the machines, can they each connect by themselves?
Actually, a better question would be, can you use connect any of them with a physical cable instead of wireless?