Sony VGC-LT18E - Manual (Page 96)

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Using Your VAIO Computer
Stopping Wireless LAN Communication
To stop wireless LAN communication
1 Click Start, All Programs, and VAIO Central.
2 Double-click Network Connections and VAIO Smart Network.
3 Click the button next to the WLAN icon.
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Turning off the wireless LAN functionality while accessing remote documents, files, or resources may result in data loss.
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Alternatively, you can slide the WLAN switch to the OFF position to stop wireless LAN communication.
For WPA-PSK or WPA2-PSK authentication, you must enter a passphrase. The passphrase is case sensitive and must be between 8 and 63
alphanumeric characters long or up to 64 characters long using numbers from 0 to 9 and letters from A to F.