This week's book giveaway is in the Other Languages forum. We're giving away four copies of Functional Reactive Programming and have Stephen Blackheath and Anthony Jones on-line! See this thread for details.
That's a pretty vague question, sreejith. Do you mean the JNDI lookup one uses to locate the EJBHome? One can use JNDI to store and locate all manner of things. Have a look at the JNDI Tutorial for some examples.