Client programs can consist of one or more Broker clients. Just as a program can open and use more than one file, a program can create and use multiple Broker clients. After created, a Broker client represents a connection to a particular Broker on a particular host. A Broker client can subscribe to events, publish events, and receive events. Broker clients can also share a connection to a Broker and they can also share the same client queue and client state. Broker clients are covered in greater detail in Using Broker Clients.