Well details matter. You require an implementation far more complicated than I have time to advise at the moment. In order for others to effectively help you; you have to provide a lot more technical details then you have already. "Gaming" or "Gambling" terminals isn't very descriptive as most online gambling I've seen is written in either Adobe Flash or Java.
Elaborate on technical details so others may help you.
e.g. what language is the server/clients written in? Is it a custom system or did you purchase a closed source product? The protocols used to communicate? etc. In all likely hood you will still need to port forward to allow external clients to connect to the server (if you require installable clients on your gamblers' machines) or a custom web client would need implemented.
Last edited by sag47; 07-05-2012 at 05:22 PM.