When problems arise, there is traditionally no easy way to determine what OPC Clients are remotely connected to which OPC Servers. You can only use a number of different operating system and vendor specific tools which vary greatly in the information they provide. It is almost impossible to run them all on the different nodes at the same time to get a consistent view.
OPCNetView provides that much needed visibility, regardless of which vendor developed the OPC processes. More importantly, it has been deliberately designed to be passive so as not to compromise security or performance.