There's a great book that details this event in one of the chapters, "What the dormouse said", iirc they used a television broadcast van sitting at the top of a

There's a great book that details this event in one of the chapters, "What the dormouse said", iirc they used a television broadcast van sitting at the top of a hill to bounce the signal from where the machine sat and where the conference was. Stewart Brand was also behind this demo and it was his idea to pipe audio from the machine to the conference, so that any UI lag was accompanied by all the disk seeking noise instead of awkward silence.