Sony VAIO VGC-LV200 - Manual (Page 176)

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Troubleshooting
Why can't I use the Bluetooth devices when I switch users?
If you switch users without logging off your system, the Bluetooth devices will not work. Be sure to log off before switching
users. To log off your system, click Start, the arrow next to the Lock button, and Log Off.
Why can't I exchange business card data with a mobile phone?
The business card exchange function is not supported.