No moment in technology history has ever been more exciting or dangerous than now. The Internet is like a new computer running a flashy, exciting demo. We have been entranced by this demo for fifteen years. But now it is time to get to work, and make the Internet do what we want it to.

-- DAVID GELERNTER is a professor of computer science at Yale and chief scientist at Mirror Worlds Technologies (New Haven). His research centers on information management, parallel programming, and artificial intelligence. The "tuple spaces" introduced in Nicholas Carriero and Gelernter's Linda system (1983) are the basis of many computer communication systems worldwide. He is the author of Mirror Worlds, and Drawing a Life: Surviving the Unabomber.