A few words on Doug Engelbart
I found that the quip about how the document that they are sharing while having a conversation is not screensharing as we commonly understand it in modern parlance to be pretty illuminating. That modern screensharing is in several ways worse than a demo that came out decades ago is frankly amazing.I've tried to recapture a bit of that early magic with https://coderpad.io/ (multiple cursors, realtime editing/execution of code), but I can only imagine how jaw dropping that demo must have been when it came out.