You can enter broker configuration options from the command line when you start a broker, or afterward.
At startup time, you use the Broker utility (imqbrokerd) to start a broker instance. Using the command’s -D option, you can specify any broker configuration property and its value; see Starting Brokers and Broker Utility for more information. If you start the broker as a Windows service, using the Service Administrator utility (imqsvcadmin), you use the -args option to specify startup configuration properties; see Service Administrator Utility.
You can also change certain broker properties while a broker instance is running. To modify the configuration of a running broker, you use the Command utility’s imqcmd update bkr command; see Updating Broker Properties and Broker Management.