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. Because of DCOMs roots in older binary and component-based protocols, it fails to deliver the flexibility needed in today's networked environments, is problematic with Firewalls and is cumbersome to deploy and maintain. 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.
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