A computer system is provided for operating a graphical user interface (GUI) to enable a customer to select products. The system comprises a displaying mechanism displaying virtual shelves containing a plurality of first selectable elements in a form of product images arranged on the shelves to represent...http://www.google.com.au/patents/US7657457?utm_source=gb-gplus-sharePatent US7657457 - Graphical user interface for product ordering in retail system
