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Connect and Disconnect from the OPC HDA Server

When an OPC HDA Client tries to connect to the Historian OPC HDA Server, and if an instance of HDA is not available, then an instance of a Historian OPC HDA server is started and the client connects to the running instance of the server. The Historian OPC HDA Server continues to run as long as there are clients connected to it. If there are no clients connected, then the OPC HDA Server shuts down immediately.

Note: After installation, an OPC client typically references the Historian OPC HDA Server by its ProgID (program ID) Proficy.Historian.HDA.