Whitepaper by Randy Kondor, OPC Training Institute
OPC technology relies on Microsoft's COM and DCOM to exchange data between automation hardware and software; however it can be frustrating for new users to configure DCOM properly. This whitepaper discusses the steps necessary to get DCOM working properly and securely.

http://www.automation.com/pdf_articles/OPC_and_DCOM_5_things_you_need_to_know.pdf

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