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Silverlight is a lightweight browser plug-in that frees your code from the traditional confines of the browser. It's a rules-changing, groundbreaking technology that allows you to run rich client applications right inside the browser. Even more impressively, it's able to host true .NET applications in non-Microsoft browsers (like Firefox) and on non-Microsoft platforms (like Mac OS X). Silverlight is still new and evolving fast, and you need a reliable guidebook to make sense of it.