Here, a driver for an light emitting diode is provided. The planar elements each contain a semiconductor material for producing ultraviolet or visible radiation when the semiconductor light source is in operation. With this arrangement, the image display apparatus can effectively suppress an electric discharge from taking place between electrodes and occurrence of a problem of broken wire. Inclined surfaces are formed adjacent a tip of the tab of the male terminal to gradually thin the tab toward the tip. Information relating to the quality of service requirements of a first message broker’s subscribers is passed to other brokers and subsequently used for selection of an appropriate communication protocol for transmitting messages between the brokers. At least one of one or more cache management operations performed by the cache controller is responsive to the page open indication so that the efficiency andor speed of the processing system can be improved.