The documentation consists of following parts:
Because the COM components are implemented by exposing the .NET objects of OPC Data Client to COM, you may need to refer to OPC Data Client reference documentation in order to find information about COM objects and interfaces of OPC Data Client as well.
You can access all the above mentioned documentation from the Start menu or the Launcher application.
In addition, there is IntelliSense and Object Browser information available from the Visual Studio environment.
The OPC Studio help contents integrates with Microsoft Visual Studio IntellISense.