To provide an image display device of the type that presents images in a certain part of the field of vision in which the image display device can be used for prolonged periods of time. The method comprises storing electronic cash in a memory 3 of or coupled to a user terminal 2, extracting electronic cash from said memory 3 and sending the extracted cash to the telecommunications network 1 inside a signalling message sent over a signalling channel or using a dedicated PDP context. In particular, the turbinates are treated by positioning one or more electrode terminal adjacent to the turbinates, and delivering electrically conductive fluid, such as isotonic saline, to the nasal cavity to substantially surround the electrode terminal with the fluid. The computing device surveys applications for calls to the components specified in the manifest.