Mother of All Demos

"The Mother of All Demos turns 50":

On December 9, 1968, Douglas Engelbart gave a demo of NLS, the "oN-Line System", to the Fall Joint Computer Conference of the ACM and IEEE. Later dubbed The Mother of All Demos, it demonstrated many concepts that would later become fundamental elements of personal computing, including the mouse, windows, hypertext, graphics, video conferencing, and word processing.