Client programs, such as a console or an adapter, use the Broker to determine where Managers are running. When a Manager starts, it registers the hostname of the machine it is running on, as well as the TCP port it is listening to, with the Broker. Thereafter, clients retrieve this information from the Broker so that they can communicate with the Manager. Chapter 7, “Operation of the Broker,” describes the functions of the Broker, provides procedures for viewing the Broker’s registry, and explains how to change the Broker’s environment variables.