[Zope] - How to register an object?

Hello, there are documents at zope.org that say I can publish an object, say 'billy', and invoke its methods with a url http://my.site/billy/my_method How can I register an object in Zope? I would expect object registration to work like external method registration, and indeed, there is an extension in the contributed code section which introduces 'External Objects' in Zope, but it doesn't work for me. Isn't there a standard way in Zope to do this? Thank you Stefan