Mirror Client is the program that actually moves the data between OPC servers. It runs as a service and starts automatically upon reboot. You can manually stop and start the service using the Mirror Tray icon in the system tray.
The Mirror Client service cannot be started if the OPC Mirror Configuration program is running. Before starting the Mirror Client service, close the OPC Mirror Configuration program.
If you change a pipe's automatic refresh configuration while Mirror Client is running, Mirror Configuration notifies Mirror Client and asks if you want to reflect the change immediately.