How to call ejb from a Swing gui application client?

Hi Everyone,
I am new to EJB and I have question for calling an ejb from a Swing GUI application client. Can anyone give me an example of how my Swing GUI can call an EJB from a SUN ONE Application Server. If anyone can give me some insight, I appreciate it.

I have looked up various sources and just can't get it to work. I know I have to use the lookup() method, but I have also seen lookups using IIOP://servename......
Context ctx = getInitialContext();
DemoHome dhome = (DemoHome)ctx.lookup("demo.DemoHome");
or
Context ctx = getInitialContext();
DemoHome dhome = (DemoHome)ctx.lookup(java:comp/......)
so can anyone tell what is the difference between using iiop://servername..... as the lookup string and java:comp/......
and if using java:comp/ what does this mean? Does it mean that lookup() method is looking for the ejb somewhere in this directory. I would really appreciate if someone can give an example of a Swing GUI calling a ejb from an application server and how the code is actually doing the lookup in and what are each steps it goes through.
Thanks

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