This paper published by Advosol talks about OPC .NET Wrappers. The OPC specifications define component interfaces based on the Microsoft (D)COM technology. (D)COM still is an important part of all Windows operating system versions. Native Windows applications need COM for inter-process communication. COM was created in 1995 to replace OLE.
This paper is intended to show how .NET applications can access OPC servers. It explains the required .NET wrappers and additional features built into OPC .NET client components.