A system for retrieving display data has a handheld device and a server. The handheld device includes an optical sensor for imaging an area of a printed substrate containing printed content; a processor for determining interaction data; a transceiver; and a touch-sensitive screen. The server is configured for: receiving the interaction data from the handheld display device; identifying a page description corresponding to the interaction data; retrieving display data using the identified page description; and sending the display data to the handheld display device. The display data corresponds to the printed content imaged by the device.