You should provide the name of the configuration directory to the startup command.
For example, if you have a configuration in $JBOSS/conf/daisy, then use
to use that configuration.
(Fill in $JBOSS with the directory where jboss is located and $jboss_command with the command that you usually use to start jboss)
How does this work in JBoss 3.0RC1? I've noticed there is no conf under $JBOSS_HOME.
I think you can look under $JBOSS_HOME/server. There should be a default directory, and it would seem that you could add other directories for other configurations, similar to what existed under JBoss 2.4.4.