This read-only field reports the name of the configuration file used to store the TCP module's persistent settings, defaulting to "@file://TCPModule.cfg" when the value is an empty string. Admins check it to know exactly which file on the device holds the saved TCP configuration, useful when backing up or inspecting device config files directly. For example, if usrTcpCfgFileName returns an empty string, the admin knows the TCP module is using its built-in default path rather than a custom filename.