Whoever that have thought of this idea of making iPad your Cash Register has the million dollar idea. iPad has large enough screen, very sensitive touch screen plus fast processor. All this actually adds up to be a very good Cash Register as you can touch on the “button” which are the pricing, then open up cash register.
Cash Register System such as Revel Systems has done a great job of implementing that.
Check out the video on how iPad can be used as a iPad Cash Register: