As far as I understand I need a file ws4ee.sar to develop WebServices under JBoss v4.0.5

I did not found this *.sar file in my current JBoss installation.
Is this an add-on which I have to download (from where ?)
or is it replaced by another archive in v4.0.5 ?

Are all *.jars which I need in v4.0.5. already included in the "standard" JBoss distribution ?

Which WebService specific *.jars do I have to add to my CLASSPATH which I don't need for other java development ?