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<networking> Either of two different incompatible radio-based
(which speaks DSSS at 2.4GHz) and
(which speaks OFDM at 5GHz).
The term was invented by the marketing departments of wi-fi equipment manufacturers.
It is, notionally, short for "wireless fidelity", on the analogy of hi-fi for "high fidelity" audio.
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Wide Area Information Servers
Wide Area Network