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I am speaking strictly from a web programming perspective here.

But I know that I "send" more or less info to computers based on user level access. It's as simple as this

if (userlevel == x) {
//something here (ie, send all holecards)
}

I don't know much about windows programming, but I can't imagine it would be too hard to do that. There's no reason it can't be running on the same client and have that programming on the server side.

I'm not saying that's the case, but that's one way that one person could receive some info and another person couldn't.