About Accessing Data in the Gateway

Client applications read and write to data items that are internal to the OI Server, as well as to the items located in the devices. Client application communication with the OI Server is done using either the OPC or DDE/SuiteLink protocols. The client application may or may not be on the same computer as the OI Server.

You do not need to create device items in the OI Server for your OPC client application.