.NET: What is that new VS feature for compiling the same project for multiple frameworks?

A couple months ago I heard about a new Visual Studio feature for compiling the same project to multiple frameworks (e.g. .NET 4 & S开发者_如何学Cilverlight). What was it called?

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Portable Library Tools

http://visualstudiogallery.msdn.microsoft.com/b0e0b5e9-e138-410b-ad10-00cb3caf4981/

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I believe you mean Multi Targeting.