http://blogs.msdn.com/aaronmar/archive/2009/06/05/pkgdef-and-the-experimental-instance-in-vs-2010.aspx***Disclaimer: This information is about Visual Studio 2010 Beta 1 only. The following may not be accurate for future releases.*** One of the new features we introduced with the Visual Studio 2008 Isolated Shell was the concept of a pkgdef file . Pkgdefen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/aaronmar/archive/2009/06/05/pkgdef-and-the-experimental-instance-in-vs-2010.aspx#9702819Sat, 06 Jun 2009 17:12:19 GMT91d46819-8472-40ad-a661-2c78acb4018c:9702819Jason Haley<p>Interesting Finds: June 6, 2009</p> http://blogs.msdn.com/aaronmar/archive/2009/06/05/pkgdef-and-the-experimental-instance-in-vs-2010.aspx#9709217Mon, 08 Jun 2009 22:21:51 GMT91d46819-8472-40ad-a661-2c78acb4018c:9709217Jon<p>I understand devenv /setup is never needed at all now?</p>http://blogs.msdn.com/aaronmar/archive/2009/06/05/pkgdef-and-the-experimental-instance-in-vs-2010.aspx#9716341Tue, 09 Jun 2009 18:58:01 GMT91d46819-8472-40ad-a661-2c78acb4018c:9716341Pedro Silva's Blog<p>Aaron (one of the developers on my team working on the SDK) just wrote a couple of great posts for folks</p> http://blogs.msdn.com/aaronmar/archive/2009/06/05/pkgdef-and-the-experimental-instance-in-vs-2010.aspx#9820221Mon, 06 Jul 2009 20:33:23 GMT91d46819-8472-40ad-a661-2c78acb4018c:9820221aaronmar<p>@Jon I think the only case where devenv /setup will still be needed is for creating the ProjectTemplateCache and ItemTemplateCache for templates installed to Common7\IDE.</p> <p>Aaron</p>