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Ideally, using infa-red, each device works in a differing "band" of the infa-red spectrum. Much like a LAN with defined IPs. However, this is also where the problems come in. Infa-red communication can be fooled by radiant heat from devices to some extent sothese devices need to be "trained" to ignore anything outside the band and to regard it as "noise".
The best approach so far is "fire wire".
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2 goldfish were discussing Mythology.
The discussion ended when a goldfish replied:
"There MUST be a God, who changes the water?"
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