QR Codes... this was easy... would have been easy... if the wi-fi connection would have cooperated.  The first step was to download a QR Reader.  I installed Qrafter.  The first QR code I could get my hands on was a Kohls sales flyer.  Saving again... sent an extra 10% on next online order.  In relation to libraries... I grabbed a book and scanned the barcode.  Options popped up like a link to order on Amazon.  Kind of cool but sure seems like a lazy way-- some people might say more efficient.