New wireless technologies, from Wi-Fi to Bluetooth to 3G, generally promise to be faster, longer-range and more efficient than their predecessors. So a new technology, called "near-field communication" (NFC), is somewhat unusual. Compared with other, better known wireless standards, it operates over very short ranges-measured in mere centimetres—and it transfers data at a comparatively sluggish pace, not much faster than a dial-up modem.
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