The Microsoft Help 2.0 help format is used only in help systems integrated with Visual Studio .NET. Visual Studio .NET uses context strings to identify topics shown in its context-sensitive help. To specify context strings for topics, use the ContextString property for each topic in the Doc-To-Help project that you want to appear in the context-sensitive help. See Using the Context String Editor for more information.
Note: Documenter for .NET automatically generates ContextString values for the reference topics it creates.