You're hunched over the keypad at the ATM, trying to remember your PIN (was it Aunt Bess' birthdate backward, or your first girlfriend's phone number?), hoping the big guy behind you can't see what you punch in. What if, instead, the machine could recognize you all by itself? That's the idea behind an iris-imaging identification system produced by Moorestown, N.J.-based Sensar now in pilot testing at ATMs and bank tellers.

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