Sony PCG-K415B User Manual page 74

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Using your VAIO computer
Bluetooth security
The Bluetooth wireless technology has an authentication function, which allows you to make sure with whom you communicate. With
the authentication function, you can avoid any anonymous Bluetooth device to access your computer.
The first time two Bluetooth devices communicate, a common Passkey (a password required for authentication) should be
determined for both devices to be registered. Once a device is registered, there is no need to re-enter the Passkey.
You can change your settings in order not to be discovered by other Bluetooth devices or you can set a limit.