With the emergence and application of wireless internet technologies such as Wireless Local Area Networks (WLAN) and Third Generation (3G) internet technology, a new type of network – the wireless network – has made people's online lives more effortless. The scenario of walking around with a laptop in any position within an intelligent building, downloading materials or printing files at any time, is no longer a movie plot. During the APEC meeting held in Shanghai, some large hotels had already implemented wireless local area networks. Below, we will...%8