When machines talk to each other

Here are a few ways devices already are chatting (silently, thankfully) among themselves.

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The voice of a new machine
The voice of a new machine
It sounds like the plot of a sci-fi action movie: millions of devices secretly communicating with one another while humans go about their day. But machine-to-machine communication is a reality--and growing fast. Yankee Group estimates that so-called M2M links (a security system sending data to a central computer, say) using cellular phone networks will grow to 217.5 million worldwide in 2015 from about 82 million today. Here's how they do it.

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Last updated April 27 2011: 6:57 AM ET
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