Sony VGN-SZ440 - Manual (Page 121)

121 n N
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.
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See To scan a fingerprint (page 123) 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.