Contains all the references to external components in a Visual Basic or C# project.
Assembly: VSLangProj (in VSLangProj.dll)
In order to write code against an external component, your project must first contain a reference to that component. A reference can be made to three types of components: .NET assemblies, .NET projects, and COM automation servers and controls. For more information on the types of references that may be added, see Add, AddActiveX, and AddProject.