Abstract: A method and apparatus by which information of similar or different types may be combined to form an integrated interactive multimedia presentation which may be used to provide marketing and conducting commerce is provided. An apparatus for providing a multi-layer interactive multimedia presentation comprises means for providing a layer of program presentation, including a plurality of link indicators, means for providing at least one additional layer of program presentation, including a plurality of link indicators, and means for providing at least one display of informational or promotional content, or means for providing at least one display of commerce/purchasing content, or any combination thereof, wherein each link indicator is operable to cause display of either an additional layer of program presentation, a display of informational or promotional content, or a display of commerce/purchasing content.

Abstract: There is provided a ventilation assembly unit for a feline litter box. The unit comprises a housing containing a fan at the base thereof. A filtering medium is contained in a canister adapted for removal and insertion within the housing. The filtering medium comprises, in combination, an air dispersing mesh covered with a layer of particulate carbon.