The Wi-Fi LAN has a broad application nowadays. Because of the comfortable and quick installation people often replace old wired LANs with Wi-Fi. Such connection allows to move your machine around the place without losing the Internet or other network resources. Working on your laptop you can check your mail from anywhere in your home or office. Some highly attended places like airports, libraries, schools or even coffee bars offer you constant Internet connection using exactly wireless LAN, so retrieving new files, cruising the global network or corresponding with others will not be a problem anymore in those (and many other) places.The most important shortcoming in Wi-Fi is the range. So far we may have difficulties in making a connection with a receiver which is more than 50-75 meters away (inside the buildings). The signal should be stronger to provide larger connectable spaces. Additionally, some of the wireless adapters works on the frequencies that are currently used by many other wireless devices. It can cause a serious interference, so the connection performance can be quite poor.However, building Wi-Fi network is often the cheapest way to achieve the desired connection with the surroundings. The price of a single wireless adapter is decreasing almost every day, so making a large network area by means of Wi-Fi is the most reasonable way. You will not need to arrange all the wires around and profit by the installation time. By the way, most of the Wi-Fi adapters have user-friendly configuration and diagnostic tools which can help you to adjust or change your WLAN settings or even can do everything for you.