An EL element having a novel structure is provided, which is suitable for AC drive. An image of an watcher who is watching the display screen is captured to detect watcher’s eye position relative to the display screen. Receptors for several different connectors are available on at least one of the indexing bodies. After forming the silicon oxide layer on the silicon substrate, the metal-oxide layer may be deposited on the silicon oxide layer. In response to receiving a reply, the network device transmits a message to the specified source layer 2 address to provide the layer 2 address of the network device and the specified layer 3 address. In accordance with the method, the IO filter driver intercepts a database management system request to write data to the database transaction log file.