Virtual Vineyards, the pioneering Internet winery, has joined the growing list of on-line sellers saying it will guarantee all credit card transactions.

Dell Computer Corp., the Amazon.com bookstore, and the Travelocity Web site have done the same to assuage doubts about Internet transaction security. Essentially they commit themselves to reimburse the maximum $50 liability to the cardholder in the event of fraud or misuse.

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