44Wireless LANIf you use a wireless LAN, you can use a network without cable connections.NOTECAUTIONCommunication is performed through the wireless LAN antenna. Do not block theantenna area with your hand or otherwise interfere with the passage of the radiosignals.Wireless LAN AntennaThe communication speeds and distances differ depending on the devices that sup-port the wireless LAN, the installation environment and other ambient conditions.One characteristic of radio waves is that their transmission rate tends to drop asthe communication distance increases. It is recommended that the devices sup-porting the wireless LAN be used in close vicinity to each other.The rate may drop while a microwave oven is being used.Windows XPDo not use the Fast User Switching function.PrecautionsDo not use wireless LAN on airplanes, in hospitals, or inother locations where wireless LAN signals may affectthe operation of devices in the vicinityIf you intend to use the computer in the environments described above, turn thewireless LAN off using the following method:To turn off the wireless LAN1 Double-click or on the taskbar.2 Select your wireless LAN adaptor and select [General].3 Select [Off] for [Switch radio].4 Select [OK]. The icon will turn to .To prevent theft of data or unauthorized access to thehard disk via a wireless LAN ( page 45) ( page 46)If you plan to use wireless LAN functions, we recommend that you do so only aftermaking the appropriate security settings, such as for data encryption.We recommend turning the wireless LAN off when it isnot in use or out of rangeIf you leave the wireless LAN on, the battery’s operating time is shortened.