"block">A client uses a <code>TopicConnectionFactory</code> object to create 
 <code>TopicConnection</code> objects with a publish/subscribe JMS provider.

 <P>A<code>TopicConnectionFactory</code> can be used to create a 
 <code>TopicConnection</code>, from which specialized topic-related objects
 can be  created. A more general, and recommended approach 
 is to use the <code>ConnectionFactory</code> object.
  
 <P> The <code>TopicConnectionFactory</code> object
 should be used to support existing code.</di