‘The Mother of All Demos’ is a name given retrospectively to Douglas Engelbart’s December 9, 1968, computer demonstration at the Fall Joint Computer Conference in San Francisco…
…The 90-minute presentation essentially demonstrated almost all the fundamental elements of modern personal computing: windows, hypertext, graphics, efficient navigation and command input, video conferencing, the computer mouse, word processing, dynamic file linking, revision control, and a collaborative real-time editor (collaborative work)...
…The demonstration was highly influential and spawned similar projects at Xerox PARC in the early 1970s. The underlying technologies influenced both the Apple Macintosh and Microsoft Windows graphical user interface operating systems in the 1980s and 1990s.”
Links to video at Stanford