Sony VGC-LS1 - Manual (Page 86)

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Using Your VAIO Computer
To disconnect from a wireless network
Turn off the WIRELESS LAN switch.
!
Turning off the wireless LAN functionality while accessing remote documents, files, or resources may result in data loss.
✍
For WPA-PSK or WPA2-PSK authentication, you must enter a network key of 8 to 64 alphanumeric characters long.