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The Mother of All Demos
The Mother of All Demos is a colloquial name given to a presentation from 1968 for the NLX Machine by Douglass Engelbert in 1968. It was fundamentally a realization of the Memex machine by Dr. Vannever Bush in his famous essay As We May Think. It introduces numerous concepts now standard to computing, including Hypertext, using a mouse (years before Xerox), telecommunications, wireless networking, versioning, and several other things.
It is widely considered one of the most significant events in the history of the development of the computer.