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DisplayFusion will make your dual monitor (or triple monitor or more) experience smooth and painless. Advanced multi-monitor wallpaper support, Flickr integration for image searching and fully customizable window management hotkeys are just a sample of the many things DisplayFusion can do.
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Wallpaper site
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Multidisplay wallpapers
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Multi Display backgrounds from deviantart
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A how-to article to save you from reaching under the Christmas tree.