There was nothing very special about the message that made Laurence Canter and Martha Siegel the most hated couple in cyberspace. It was a relatively straightforward advertisement offering the services of their husband-and-wife law firm to aliens interested in getting a green card -- proof of permanent-resident status in the U.S. The computer that sent the message was a perfectly ordinary one as well: an IBM-type PC parked in the spare bedroom of their ranch-style house in Scottsdale, Arizona. But on the Internet, even a single computer can wield enormous power, and last April this one, with only a tap on...
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