A visual display method involves storing, in multiple portable display units, visual information to individually be displayed by each of the multiple portable display units located within a venue in response to instructions broadcast wirelessly for receipt by at least some of the multiple portable display units within the venue; establishing, for each portable display unit within the venue, a first ad hoc address based upon each portable display unit's physical location; and wirelessly broadcasting instructions for receipt by the portable display units instructing at least some or the multiple portable display units to display a specific portion of the visual information associated with their respective first ad hoc addresses, so that each of the multiple portable display units will display their specific portions of the visual information associated with their ad hoc addresses as specified by the broadcast instructions.