Abstract: According to a first aspect of the invention, there is provided a display assembly device comprising first and second faces, the first face arranged to present a first display and the second face arranged to present an optional second display, the device further comprising a computer system operable to run a plurality of application programs using one or more processors to execute a set of stored instructions, wherein the one or more processors is configured by the set of instructions to limit arrangements in which content is displayable on at least one of the displays as display content associated with an application program provisioned on a device infrastructure of the display assembly device.