53Wireless LANCAUTIONz Do not use wireless LAN on airplanes, in hospitals, or in other locations where wireless LAN signals mayaffect peripheral devices.Follow the instructions of airline companies and hospitals. If you use the computer in these locations, turn off the wire-less LAN.z To avoid unauthorized access to the computer through wireless LANWe recommend you to make security settings such as encryption before using wireless LAN. Otherwise the hard diskdata such as the shared files can be exposed to the risk of unauthorized access.NOTEz Communication is established through the wireless LAN antenna (A). Do not block theantenna area with your hand.z You cannot use the wireless LAN function together with the Fast User Switching function.z The transmission rate will be lower when a microwave oven is used.When you are using all or any of wireless LAN, Bluetooth and wireless modem in combination, you can turn them on/off usingWireless Switch Utility (Î page 51).Turning on/off the wireless LAN communication1 Slide the wireless switch (A) to turn on / off the wirelessLAN.z The Wireless Switch Utility icon on the notification area:• : Wireless LAN function is on.• : Wireless LAN function is off.• : Wireless LAN is disabled in the Setup Utility (Î page 62).Using the Wireless LAN Function