Announcing the Visual Studio 2008 Shell
If you create software development tools, you’ll want to consider building on the Visual Studio 2008 Shell. A streamlined Visual Studio development environment, the Visual Studio Shell provides the core foundation so you can focus on your application’s unique features. Use the Visual Studio SDK to create applications to distribute with the VS 2008 Shell in either integrated or isolated mode.
Visit https://msdn.com/vstudio/shell for more details.