You can see the submenu such as <Figure 1>, when you choose the Config menu from OPC Client menu bar.
<Figure 1> Config menu at OPC Client Main
Config menu includes Connection Config, Plc_Scan Comm Setting, Etc Config.
Connection Config : Setting the reconnection method, when OPC Server (which is registered) is disconnected.
Plc_Scan Comm Setting : Setting the Shared Memory name to use. (when OPC Client Main communicate with Plc_Scan)
Etc Config : Setting the renew time of current value which appears at current value column.
Relate items)
Configuring Connection to OPC Server