A data processing system is able to perform parameter-selectable prefetch instructions to prefetch data for a cache. If a network dictionary retrieval is performed through connection to the dictionary server, a dictionary storing the registered retrieval word is retrieved in the dictionary server, is transmitted to the electronic dictionary, and is displayed. The difference is a difference in a payload size of a current frame and a previous frame. A second heat producing element is formed on the first side of substrate co-planar with, but not touching the first heat producing element.