American Express Blue as User Authentication?

jtdennis asks: "I just got my Smart Card reader for my American Express Blue card. It's a nifty little thing, but I was wondering if it could be used for other things like logging in to my computer. When I installed it on my NT workstation here at work it added a Smart Card Reader Control panel that said it was a "GCR415 Serial Smart Card Reader (Or Compatible)" Does anyone have any information about this?" Interesting thought. You would need to have the interfacing specifications for the card itself (which I expect are proprietary), but I don't see why this couldn't be done. I just have to wonder if American Express ever expected that this card would be used for such a purpose...