In Pictures: The Mother of All Demos - The 1968 presentation that sparked a tech revolution

On December 9, 1968, Dr. Douglas Engelbart addressed a packed theater at the Joint Computer Conference in San Francisco, demonstrating a new computing platform that heralded advancements from the computer mouse to videoconferencing. Forty-five years later, we're still reaping the benefits of his vision.

Revision tracking and control A necessary adjunct to the business of collaborative editing is keeping an accurate record of who did what to a document. In a non-real-time way, NLS as demonstrated by Engelbart had it.

Microsoft Office's Track Changes feature does too: As files get passed around, the comments, additions and deletions of each contributor appear in different colors, waiting for an editor to accept, reject or modify changes.

Collaborative cloud-based tools such as Google Docs, wikis and knowledge bases have embraced revision control even more tightly, with the ability to quickly roll back to previous versions of a file. It's in wikis and other joint projects that collaborative editing and strong revision control have found their strongest advocates. Where would Wikipedia be without revision control?

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