mseller,It sprays a unique orange code on each piece, takes its picture, and attempts Optical Character Recognition to try and read the address. The orange code, the picture of the piece, and the address are all stored.If it can't figure out the address, that piece of mail is recalled by it's orange code, and the image is sent to a human to verify and enter the address.EVERY piece of mail is uniquely identified by one of those orange codes.