PN, you usually make a lot of sense, but I only got half of that. I take issue with your opening statement. I could sit at an HQ or Station terminal and access both the intranet and the internet. Therefore there is a connection. Stranger things happened on the pink side and I had no desire to understand the connectivity there.
My point was, if your system is completely isolated from the outside world, no physical paths, it doesn't matter who made the chips, they can't create a link where none exists.