PRETORIA, South Africa -- In what sounds like a "tomorrowland" exhibit at a World's Fair, a Pick 'n Pay hypermarket here recently demonstrated a technology that lets point-of-sale systems tally an order in one second without the shopper ever removing his purchases from the cart. The system, called Supertag, relies on radio-frequency tags and simple, low-tech radio receivers wired to the registers. Clerks and shoppers on hand for two one-day, one-lane demonstrations recently were impressed. ...

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