As messages arrive on a specific destination, by default they are
sorted in FIFO (first-in, first-out) order, which sorts ascending based
on each message's unique
JMSMessageID. However, you can
use a destination key to configure a different sorting scheme for a
destination, such as LIFO (last-in, first-out).
After you configure a destination key, you can select it from within a destination resource, such as a queue, topic, distributed queue, distributed topic, or JMS template if you are using templates to configure your destinations.
For more information about these fields, see Configuration Options.