Yep, and because of his .plan files, and no other historical details around the technology, I think it's safe to say he invented it. In 1999, QuakeWorld was the

Yep, and because of his .plan files, and no other historical details around the technology, I think it's safe to say he invented it. In 1999, QuakeWorld was the first, to my knowledge, implementation of client-side prediction in a first-person shooter. But I'm almost certain there were rudimentary client-side prediction models that existed before John Carmack, which is why I say I think he was the first to "invent" it, but frankly I'm not so sure about that. I mean think about terminals, as an example. I do think with near certainty he was the first to invent the client-server with client-side prediction architecture in time stepped software, or more specifically in an FPS.