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copied!<p>The way I read this is that DCOM/COM/OLE was the substrate upon which OPC standards (which are intercommunicating objects defined by interfaces as groups of methods) were built in windows. In other words OPC which consists of object, interfaces and methods can be and has been built out a DCOM which is a technology on windows that allows the creation of these. </p> <p>Hence OPC could be built out of other substrates, but I'm not familiar enough with to know if it has been. I'd suspect yes for non windows based systems.</p> <p>From <a href="http://www.opcfoundation.org/Default.aspx/01_about/01_whatis.asp?MID=AboutOPC" rel="nofollow noreferrer">here</a></p> <blockquote> <p>OPC is open connectivity in industrial automation and the enterprise systems that support industry. Interoperability is assured through the creation and maintenance of open standards specifications. There are currently seven standards specifications completed or in development.</p> </blockquote> <p>Specifically:</p> <blockquote> <p>OPC is a series of standards specifications. The first standard (originally called simply the OPC Specification and now called the Data Access Specification) resulted from the collaboration of a number of leading worldwide automation suppliers working in cooperation with Microsoft. Originally based on Microsoft's OLE COM (component object model) and DCOM (distributed component object model) technologies, the specification defined a standard set of objects, interfaces and methods for use in process control and manufacturing automation applications to facilitate interoperability. The COM/DCOM technologies provided the framework for software products to be developed. There are now hundreds of OPC Data Access servers and clients.</p> </blockquote>

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