Contactless bank cards

[Roland Perry]

In article <4CE4D01F.3010703 at iosis.co.uk>, Peter Tomlinson 
<pwt at iosis.co.uk> writes
>There is also a risk that mobile phone based methods using NFC 
>technology will wake up the tokens when the field strength from the 
>terminal is lower than needed to wake up an ordinary smart card - but 
>with NFC you should be getting a message on the phone's screen (and 
>maybe a squeal as well) to show that a value transaction has taken place.

One of the difficulties of RFID is multiple cards. I know that a 
door-entry RFID which I have interferes with my Oyster, for example. I 
wonder what will happen when people have multiple pay-wave cards in the 
wallet?

-- 
Roland Perry