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Stateful session bean -- clarification urgent

 
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Stateful session beans are suggested to be used over Stateless session beans in the following context:

"The bean needs to hold information about the client across method invocations. "

1> Can't the information be stored in the web tier? When the web tier can store the information how does session bean get justified to be used.

2> Also, what kind of information about the client, can somebody give an example. I know the standard example quoted is Shopping cart. But, i am still not able to appreciate the use of stateful session bean. can anybody point me to any web sites or share information to help me understand better.
 
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But, i am still not able to appreciate the use of stateful session bean. can anybody point me to any web sites or share information to help me understand better.



http://java.sun.com/j2ee/1.4/docs/tutorial/doc/EJBConcepts3.html#wp79790
http://www.theserverside.com/tt/books/wiley/masteringEJB3/index.tss
 
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