A little history lesson for those out there in library land who don't know who Dr. Douglas Engelbart is. Engelbart gave the world a couple things that we, as library professionals, use every day. He invented a small device capable of positioning a cursor in an X-Y display environment. We call such a device a computer mouse. He also created an interesting technology that allowed the linkage of information to a given word displayed on a computer screen, in other words, hypertext.
Then there's his idea that we'd call Windows, the video conferencing idea, his notion about e-mail, and something called copy and paste.
He displayed and explained these ideas at a demonstration in 1968 which came to be called "The Mother of All Demos." Watch the video over at Google and see how our world changed forever.