This feature started being rolled out on 13 September 2008, and allowed viewers to watch previous programmes from selected series until the series has ended, with a limit of up to thirteen weeks after first broadcast.
Not all programmes will form part of the stack, however.
The feature was added to the search function and the channels function.
When users click on a programme by another broadcaster, they are redirected to the relevant broadcaster's catch up service (either the ITV Hub, All 4 or My5).
The open beta incorporated a media player, an electronic programme guide (EPG) and specially designed download client, and allowed the download of BBC Television content by computers assigned to a United Kingdom-based IP address, for use up to thirty days after broadcast.
However, it was available only to users of Windows XP.
The original i Player service was launched in October 2005, undergoing a five-month trial by five thousand broadband users until 28 February 2006.