The site's interactivity is powered by software that creates a virtual map of the handsets.

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Already, it boasts mashups from Microsoft's Virtual Earth map service on Marriot's Web site.

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It claims the software creates a virtual topographical map of your features, which is then measured against the donor database, looking for similar surface textures, vector templating and, of course size of features.

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It's then plotted on a virtual pushpin map.

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The iPhone has a larger screen than BlackBerry, a better (virtual) keyboard, a GPS map, and a unique configuration of Internet, phone, iPod, and calendar tools.

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Players had to map out their progress in virtual worlds on sheets of graph paper, or write down lengthy passwords to save games.

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Additionally, only those fans will be able to adopt one of the one million trees being planted on behalf of Earth Day and receive a virtual hometree they can locate on a map to see where it's actually planted.

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In his talk, Teso demonstrated an Android application he built that allowed him to redirect a virtual plane with just a tap on a map application running on his Samsung Galaxy phone.

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Virtual L.A. may become valuable for police and firefighters, who could quickly map the best route to an emergency.

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