Sony VGN-SZ4MN/B User Manual page 118

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Customizing Your VAIO Computer
10 Swipe your finger across the fingerprint sensor four times to perform a swipe test, and then click Next.
The Enrollment window appears.
See To scan a fingerprint (page 120) for the scan procedure.
Swipe the same finger for the swipe test.
If you fail a swipe test four times, click Try again and perform the swipe test again.