Amazingly, you can watch the whole thing: https://www.youtube.com/watch?v=yJDv-zdhzMY

So worth the watch. The list of novel contributions outlined in the demonstration is incredibly impressive, but you also have to include the developments that went into making the presentation itself. For example, high-speed modems were developed an a microwave transmission system engineered so that they could run the software and teleconference remotely from miles away — no mean feat in 1968!