Sky Active is the brand name for interactive features on Sky Digital and is available in the UK and the Republic of Ireland. It enables a viewer to interact with TV content, respond to an advertisement or access internet-based services.
The service replaces Open.... which helped launch Sky Digital's interactive content, and launched many other features that viewers see today such as games, emailing and shopping via their TV.
It can be accessed by pressing the red button on a Sky Digital remote, while watching any Sky Digital Channel. Alternatively, there is an entry in the "Interactive" area of the EPG.
References
Sky Active Wikipedia(Text) CC BY-SA