Pretty much you bring in your check, show the clerk a valid ID, then on this little machine, I believe is also used for swiping credit and debit cards, the customer inputs their social security number.
They say the rule, which places a cap on the amount that banks can charge retailers each time a customer swipes their debit card, hurts customers and banks.
The Federal Reserve proposed rules at its board meeting on Thursday, December 16, 2010, to limit the interchange fee that banks charge retailers when the customer uses a debit card.