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One EJB 3.0 Container vs more than one  RSS feed

Bane Devrnja
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Adam Bien in his "Real World Java EE Patterns" on page 34 says:
"You have to be aware of nature of distribution, per-value and per-reference semantics, and exception handling. You have another option - don't distribute your system. Deployment of entire application to a single JVM solves the challenges in an elegant way - the fallacies of distributed computing doesn't apply any more.The system isn't distributed; you can work with objects in transparent way. You can partially achieve that even with Jave EE 5 - you can run as many layers as possible in a single process."
So it is possible to have presentation layer (JSF) in EJB 3.0 container and enterprise beans deployed in same container exposing/using only @Local interfaces.
But when some components are distributed on say two containers - are the components registered in java:comp/env namespace also visible on another container? Or is this is specific to container how to link the beans in a remote container? Is there a difference in this respect between EJB 3.0 and 3.1 container?
I found (Enterprise JavaBeans 3.0 - page 34) :"The <ejb-ref> can be linked to specific EJB container by using <ejb-link> element." Still it is unclear how is it achieved - is there some global name that is visible via JNDI outsade the container an can be seen by another container which needs to reference that component, and then <ejb-link> should have that 'global' name that other container exposes?
It is sorta covered in the JavaRanch Style Guide.
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