Hi James, I think the reason your initial question was a bit ambiguous (besides the fact that addListener() isn't a method of InvokerCallbackHandler) might have been that, on the client side, an InvokerCallbackHandler can be reused by many Clients and callback Connectors, so it's not associated with a particular Client. On the server side, however, when the addListener() method is called on your ServerInvocationHandler, the InvokerCallbackHandler that gets passed *is* associated with a particular call to Client.addListener(). You can get the sessionId of that Client by casting the InvokerCallbackHandler to org.jboss.remoting.callback.ServerInvokerCallbackHandler and calling its method getClientSessionId(). Hope that helps. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4023358#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...