trackpad in 2008.

Computer

"My friend Marvin Minsky tells me there's great controversy in the artificial intelligence community over how many buttons a mouse should have", Jerry Pournelle wrote in 1983. In the matter of the number of buttons, Engelbart favored the view "as many as possible." The prototype that popularized the idea of three buttons as standard had that number only because "we could not find anywhere to fit any more switches."

Those

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