An application for a client device which is arranged to receive and render selected video streams including content indicators relating to content to be rendered at a given location on a screen of the client device is disclosed. The application responds to user interaction with a rendered stream at rendered locations of the content to store an indicator of the user's interest in the content. The application then cooperates with an analyzer, arranged to analyse the user's interest in the content, and responds to the interest satisfying business logic by providing an indication of an interaction opportunity to the user of the client device during the rendering of the video stream.