From: Chris Hibbert <firstname.lastname@example.org>
> In Mondex, each card or terminal records the last several
> transactions. (Terminals may store a different number than cards.)
> My recollection is that cards store between 10 and 20 transactions.
> (Let's call it 10.) Each card/terminal has an ID, and that's recorded
> along with the transaction info by the other party.
I'm planning to submit the British Mondex system, not the US version
of it. The US and British versions differ on these details.