Abstract: A television broadcaster (which could be a satellite, cable or terrestrial, digital broadcaster) broadcasts from their broadcast head end via radio waves or a cable, as appropriate, linear digital television content to users' remote terminal digital television receivers or set top boxes. As well as broadcasting the linear television content, the broadcast head end also broadcasts as a continuous loop or carousel, software such as operating system software, application program interface software and television interactivity enabling software, that can be used by the set top boxes. This software is transmitted alongside and/or within the linear television signal, and uses the redundant space that is present in the digital television signal.