The is the typical @In vs @PersistenceContext question.  The answer is summed 
up nicely in this thread.

http://jboss.com/index.html?module=bb&op=viewtopic&t=106019

Basically to answer your questions:

1.  What the <core:...> is doing for you is configuring a Seam managed 
persistence context.  You take advantage of this by using the Seam managed 
context instead of the EJB3 managed context.

2.  How do I do that?  Use the @In annotation.  The Seam managed context is a 
Seam component exposed via Seam's bijection mechanism so use the @In annotation 
to get it.

3.  So how are they different?  See Christian's answer in the link above, or 
read my answer here.  First, the following link has a good description of Seam 
and ORM.  
http://docs.jboss.com/seam/1.2.1.GA/reference/en/html/persistence.html Use the 
link to familiarize yourself with the benefits of the EJB3 extended 
PersistenceContext.  The difference between the Seam PC and the EJB3 PC is that 
Seam provides a couple of features that EJB3 doesn't, otherwise in terms of 
APIs they're the same.

1.  The lifecycle of the EJB3 PC is bound to a Stateful Session Bean, and is 
only shared between components participating in the same transaction.  The Seam 
PC has conversation scope and can be injected into any component participating 
in that conversation regardless of its transaction context.

2.  Seam PC has better clustering and caching abilities.  See the Seam doc link 
above for reasons why.

3.  Seam PC is managed by Seam not EJB3, thus it can be used within non EJB3 
Seam components.  So you can still benefit from a standard JPA interface while 
allowing Seam to manage the PC and transactions for you, all outside of EJB3.  

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