"mgt012" wrote : Main difference between the invokers(transports) and callbacks ? | In applications at what situations do we use the invoker and callbacks ? Well, you're comparing apples and oranges. Or, maybe, apples and hamsters. :-) A transport is a set of classes used for transmitting messages across a network. A callback is a message sent asynchronously from the server to the client. Maybe you're thinking of comparing invocations and callbacks? An invocation is a procedure call from the client to the server, including a response. Take a look at the Remoting Guide (http://labs.jboss.com/jbossremoting/docs/guide/index.html). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4084637#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...