Computers: Calling Up an on-Line Cornucopia

Computer networks are supermarkets of services and information

Peggy Berk, a Manhattan communications consultant, starts her day by turning on her modem-equipped computer, dialing into the GTE Telemail network and reading on her screen any overnight telexes from her clients. Tapping a few keys, she scans the electronic version of USA Today before switching to another network, the Source, and perusing the A.P. and U.P.I. news wires. "I can get along without my morning toast and coffee," she says, "but I can't leave home without going on-line first."

Preparing to take a vacation in Jamaica, Systems Analyst Haig Hovanees logs on to CompuServe, another computer network, calls up Travel...

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