QUOTE(UE_Research & Development @ Jan 29 2007, 04:42 PM)

I was under the impression that you also needed a PIN to take money out of a checking account.
Yes and no. As mentioned, some debit cards allow you to run them as credit cards...in general they need to be affiliated with one of the major credit card companies, like Visa or Mastercard. Other debit cards that aren't affiliated have to be run as debit, with a PIN # entry. This, at least, from my experience running a cash register at my store.
On the flip side, I've seen (to the best of my knowledge, though the person(s) may have been mistaken about their cards), people use a credit card as a debit card by using a PIN # assigned to that card by the CC company. Never tried it myself, however, so I can't say for certain that it works.