OPC (Open Platform Communications) is an open standard for industrial device communications. There are different versions of OPC including OPC DA which uses DCOM, OPC XML which uses XML/SOAP, and OPC UA which does not use DCOM. OPC .Net uses WCF. OPC clients communicate with OPC servers using these standards, which then communicate with devices using proprietary protocols. InduSoft provides OPC client modules and support for developers.