Sony PCG-K415B User Manual page 76

If the documentation of the other bluetooth device contains a password, click Use the passkey found in the documentation
and enter the passkey.
If you want to create your own passkey, click Let me use my own passkey and enter a passkey.
If your device does not use a passkey, click Don't use a passkey.
7 Click Next to continue.
8 Once the remote device has been successfully authenticated, click Finish.
Do not simultaneously use the Bluetooth functionality and wireless communication devices which use the 2.4 GHz band such as a wireless LAN PC Card.
The passkey can be different each time, but must be the same at both ends.
For certain devices, such as a mouse, no passkey can be entered.
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Using your VAIO computer