Abstract: A cooling system for cooling the components of an electrically driven rotating device, in which system the rotating part (4) of the device produces a current of a medium, such as air, the electric drive consisting of an electric motor (5) for rotating the device and an electronic control unit (6) controlling it, and which cooling system comprises at least one cooling element (62) for cooling the components. The cooling element (62) is disposed near the flow created by the rotating part (4) so that the heat produced by the components can be transmitted either directly and/or via a thermally conductive means to the current of cooling medium (63) created by the rotating device.

Abstract: A method of generating and redeeming an electronic coupon for a purchaser. The method comprises the steps of generating an electronic coupon at a central server 5, the coupon being, associated with a purchaser's identity, sending a request for the coupon from a point-of-sale 14 to the central server 5, the request identifying the purchaser; and sending the coupon from the central server 5 to the point-of-sale 14.

Abstract: A method of enabling a television viewer to interact with a television programme. A television signal corresponding to said television programme is broadcast by a television corporation 1 whilst an information server 5 is synchronised to the broadcast. Messages are sent from the information server 5 to a mobile wireless terminal 7 operated by the television viewer and/or received messages received at the information server 5 from wireless terminal 7. The sending and/or receipt of messages at the information server 5 is synchronised with the broadcast television signal.