Since the start of digital tv, and the availability of more than just the standard channels, the BBC has been running a red button interactive service. This service started with Wimbledon in 1999, allowing the user to select to watch a different court, see the scores or play along with a quiz.
Enter the internet, using the internet, the BBC are able to take the technology used to deliver iPlayer to your mobile and PC and with the incase in connected televisions, use that to expand the red button service.
Have you tried the red button service? http://www.bbc.co.uk/blogs/bbcinternet/2012/06/the_future_of_red_button.html for more on the BBC’s plans for Red.