Sony VGN-SZ440 - Manual (Page 140)

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Customizing Your VAIO Computer
Logging onto Windows
1 Wait until a message TPM Cryptography in progress closes on the Windows log-on screen.
2 Swipe the finger with the enrolled fingerprint across the fingerprint sensor.
3 Enter the PIN if you set it.
Windows launches.
✍
You can log onto your user account just by swiping the finger with the enrolled fingerprint even if your computer is shared by multiple users.