# Classic OPC (OLE for Process Control)

**URL:** <https://forumautomation.com/t/classic-opc-ole-for-process-control/752>\
**Category:** Industrial Networking\
**Created:** [February 1, 2016, 1:08pm UTC](https://forumautomation.com/t/classic-opc-ole-for-process-control/752 "2016-02-01T13:08:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![hkelly](https://forumautomation.com/letter_avatar_proxy/v4/letter/h/858c86/32.png) [@hkelly](https://forumautomation.com/u/hkelly)\
**Post date:** [February 1, 2016, 1:08pm UTC](https://forumautomation.com/t/classic-opc-ole-for-process-control/752/1 "2016-02-01T13:08:33Z")

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The OPC Classic specifications are based on Microsoft Windows technology using the COM/DCOM (Distributed Component Object Model) for the exchange of data between software components. The specifications provide separate definitions for accessing process data, alarms and historical data.