The OPCToolTester.exe is located in the ZapTools\OPC_DOTNET451 folder, in the installation folder of SeqZap (usually C:\Program Files (x86)\SeqZap).
The OPCToolTester.exe will list all servers discovered by the local OPC server, and list the fields (leaves) found on those servers.
The OPCToolTester.exe connects to the OPC server on localhost through DCOM by default, but this can be changed by using the –h <hostname> argument – to connect to the local OPC server using normal COM, the empty hostname can be specified by using –h “”.
By default the OPC values are only listed, but not read, to read the values the –r argument can be added.