 back by calling the <code>JMSContext</code>'s <code>commit</code> or
 <code>rollback</code> methods.
 <li>If <code>sessionMode</code> is set to any of <code>JMSContext.CLIENT_ACKNOWLEDGE</code>,
 <code>JMSContext.AUTO_ACKNOWLEDGE</code> or <code>JMSContext.DUPS_OK_ACKNOWLEDGE</code>. then the session will be
 non-transacted and messages received by this session will be acknowledged according to the value of
 <code>sessionMode</code>. For a definition of the meaning of these acknowledgement modes see the li