Use a URL (like opcda://localhost/MyServer ) to point to your server.

: Creating groups and adding specific "tags" or "items" (e.g., PLC memory locations like PLC1.Value1 ) for reading or writing. Synchronous & Asynchronous Operations

Without OpcNetApi.dll , a developer would have to write complex interop code to talk to the COM interfaces directly. This process is error-prone, difficult to debug, and requires deep knowledge of DCOM (Distributed COM) settings.