This group of standards, created by the OPC Foundation, provides COM specifications for communicating data from devices and applications that provide historical data, such as databases.
OPC technology is based on client / server architecture.
DCOM also provides OPC HDA with full security features such as user authentication and authorization, as well as communication encryption services.
To do this, system integrators must configure DCOM properly as well as open ports in the firewall.
If using the Windows firewall, users only need to open a single port.