The company produces more than 15, 000 standard products, including amplifiers, data converters, and low-power radio frequency devices.

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It installed 33 RangeLAN 2 series radio frequency transceivers, or access devices, in the drop ceilings above classrooms, the cafeteria and the library.

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SmartGrip, which connects to other devices either by radio frequency or tiny cables that run through the rifle sling, can be attached to nearly any rifle.

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The patent points out that networked portable devices which employ infra-red or radio-frequency communication have limitations.

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In an announcement of sorts yesterday, DARPA reportedly said that the project's goal is to use "set of handheld devices" to track down a specific "signal emitter of interest" using radio frequency geolocation, and presumably some other measures they're not about to dish the details on.

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