This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Jothi, A couple years ago I was curious and set my debugger to the line of PortableRemoteObject.narrow() in my code and looked at the fields in the object. I saw a bunch of networking related stuff. I don't recall exactly what is in there anymore so it's hard to elaborate. You could try the same experiment if you are really curious.
Jeanne, thanks for the hint. I just want to ask you one more thing is that did you ever come across a line that talks about this in the Head First EJB? If yes could you please tell me which page is that?