Douglas Engelbart Demonstrates Interactive Computing

A Computer Demonstration in San Francisco

On December 9, 1968, Douglas Engelbart and colleagues from the Stanford Research Institute demonstrated their online system at a computing conference in San Francisco. They showed people editing information, following links and working together at a distance. Engelbart operated a terminal on stage while the underlying system was at SRI in Menlo Park. The audience could see screen output and video arranged as part of the presentation. That connection was important to the argument: the machine was being used as an instrument for ongoing work, with people and equipment distributed across more than one location, rather than as an appliance waiting for a batch of calculations.

The Mouse Was a Small Part of the Idea

A hand moved a pointing device while other controls and keys gave commands. The mouse became the most famous object associated with the demonstration because it can be recognized in a modern desk setup. Engelbart's broader interest was how people could organize and improve difficult intellectual work. Structured documents could be viewed in different ways, edited and connected with references. Collaboration required that participants be able to see what others were doing and respond. The pointing device was valuable because it made selecting and changing things on a display easier within this larger arrangement.

Why the Demonstration Had to Be Live

Films and diagrams can show what a designer hopes a system will do. A live demonstration gives an audience a different sort of evidence, because commands and responses happen in front of them and failures are possible. Engelbart's group had to coordinate links, displays, cameras and people at both ends. Remote collaboration meant more than showing two faces on a screen: participants could work with shared information while communicating. The performance depended on considerable preparation, but that preparation was part of what it demonstrated. An interactive system useful for groups had to function as a combination of software, communications and human procedures.

What Later Computers Did With Those Ideas

Personal computers and networks eventually made several of these functions familiar, in forms very different from the SRI system. It would be misleading to say the audience saw a finished version of every later tool. They saw convincing examples of operations that could change what computing meant for a writer, researcher or team. The demonstration also preserved a question that outlasted its hardware: whether giving people better ways to point, revise, refer and coordinate could improve their collective ability to solve a problem. The lasting subject was the work people did together; the devices were ways of making that work possible. The archived recording gives later viewers access to the public performance, even though it cannot reproduce what the terminal felt like to use.