The firm has been refining the Dash Express since May 2007 and plans to make a big push at CES. Robert Acker, Dash's senior vice president of marketing, says location-based services and wi-fi are a natural pairing.

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The deal will allow Sirius to make a big marketing push at holiday time, traditionally a big selling period for satellite radio.

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Clayton said the company might make a PR push for the North American market at some point in the second half of this year.

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The Veterans Affairs Department, perhaps the largest federal agency to make a big push for mobile devices, has settled on security at the application layer, a course that the largest potential federal buyer, the Defense Department, is unlikely to copy.

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