Preface to Practical Wireless Local Area Networks With the emergence and application of wireless local area networks (WLAN), third-generation internet technology (3G), and other wireless internet technologies, 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 just a movie plot. During the APEC meeting held in Shanghai, some large hotels had already realized wireless... %8