Application Control Application Control



This indicates detection of the OPC HDA Automation IOPCHDAItemEvents command.
OPC (OLE for process control), currently known as "OPen Connectivity", is a standards specification by the OPC Foundation designed for communication between multi-vendor devices and control applications. OPC Historical Data Access Automation (OPC HDA Automation) is used to access process data by automation applications. This interface provides the same functionality except it is in an "automation friendly" manner.