I built the HEAD from CVS of Seam and rebuilt the DVD store application. I was 
in fact able to produce a bug:

1) Add two different titles to the cart. 
2) Open the cart in two different windows/tabs.
3) In the first window/tab, check 'Remove' on the top title, then click the 
update button.
4) Go to the second window/tab where both titles still show. Set the quantity 
of the first title, (the one that was just deleted) to some value, IE 10, and 
click update. 
5) The page refreshes showing the second product with the quantity you just 
attempted to set on the first.

Perhaps this sounds like bizzare behavior to execute on the application. 
However I'm evaluating Seam as a framework for a re-write of a very workflow 
oriented web app. The thing that caught my interest was the idea of 
conversationing to prevent odd things from happening due to back button use as 
we have many non-savvy users that don't listen to "don't do that". Bizzare 
things like that happen daily. 

I understand part of it is that the DVD store application is supposed to be a 
simple demo, but if there's some way I could modify it such that the 
application was smart as to the illegality of the action, and handled it 
properly, that would be great. A big challenge for the application I'm 
developing on is going back and coding for each individual illegal type action. 
If it could somehow sense "this person tried to step back in the conversation"  
 elegantly, that would be great!

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