Java Game Smart Card Implementation

Hi,
As an assignment i have been told to design a smart card application,(theory only). My idea was that of cross-platform java games that could be stored on a smart card,so for example:
-the smart card could be used in PC and mobile (allowing games to be restarted at the same stage).
-the card would store high scores, character info, and background environments
- the card could send game data to friends, by either using the smart card in their devices or via the internet extracting and downloading from the card, or better still off the phone to anothers phone by selecting them from the address book
I was wondering if there were any other ideas that i could use, and more importantly the technical details of how to implement such a card
-ie which card
-how much memory
-the equipment required
I would appreciate all the help you could give me, and it is quite an interesting topic.
thanks
jag

http://forum.java.sun.com/thread.jsp?forum=23&thread=357393&tstart=0&trange=15

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