How to send Subtopic Message From Server-Side to Client ?

I’m new at flex and i have a new question about Flex
Message Service.
How to send messages from Server-Side Java Code with
Subtopic?
For example.
I customed a Flex Message Adapter in Tomcat Server , with
this Adapter , i can send message to Client with following code .
---------------------Send message to Client------------
MessageBroker msgBroker =
MessageBroker.getMessageBroker(null);
String clientID = UUIDUtils.createUUID(false);
AsyncMessage msg = new AsyncMessage();
msg.setDestination("CustomMsgServiceDes");
msg.setClientId(clientID);
msg.setMessageId(UUIDUtils.createUUID(false));
msg.setTimestamp(System.currentTimeMillis());
msg.setBody(clientID + "this is my message from server! \n");
msgBroker.routeMessageToService(msg, null);
---------------------Send message to Client------------
But i want send a message that have Subtopic to the Client ,
How to do ?
Thank you for reply.

There's a white paper that talks about this subject -
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=8f1eb6ea

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