How do I connect the JBoss4 Message Driven Bean to a theme on a remote server?

I have a JBoss server (Server A) that posts posts by topic. I have a message managed by a bean on another server (server B) that needs to receive messages from server A.

How can I do it? I can easily get everything to work if the publisher and subscriber are on the same server, but I cannot find any information on how to do this using a remote server.

Thanks.