Abstract: Content comprising a content portion and an advertisement portion is presented to a user via a client device, by requesting presentation content from a content server, presenting, using the client device, a presentation derived from the presentation content, determining when a presentation reaches an advertisement insertion point in the presentation, prior to reaching the advertisement insertion, requesting an ad collection, the ad collection comprising a plurality of ad impressions, for an advertisement presentation for the advertisement insertion point, presenting the user with a first ad impression of the ad collection, receiving user interactions of the user with the first ad impression, recording the user interactions as stored actions data, and taking an action in response to the user interactions, wherein the action for at least one specific user interaction is to change from presenting the first ad impression to presenting a second ad impression of the ad collection.

Abstract: An electric power supply apparatus including at least first and second electric battery storage means for operating energy. The electric power supply apparatus further includes in situ electric charging means and switching means for selectively recharging one of the first and second battery storage means while the other battery storage means is connected to an electrical load.