Since January of 2000, computer saboteurs have knocked out some of the biggest sites on the Web-like eBay, Amazon.com, and Microsoft's Hotmail and Expedia-by flooding them with bogus Internet traffic. Unlike most computer sabotage, swamping a server requires no breach of security and little computer expertise. The inundating traffic is otherwise innocuous; there's just too much of it, coming too fast. And programs for launching these "denial-of-service" attacks-so called because the bogus traffic denies legitimate users access to the server-can easily be found online.

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