OPC - OLE (Object Linking and Embedding) for Process Control :: The Industrial Interoperability Standard
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A software program that is used to contact and obtain data from a Server software program either on the same computer or on another computer. A client makes a request and the server fulfills the request.
An easy example of a client would be an e-mail program connecting to a mail server or an Internet browser client connecting to a web server.
In the case of OPC,