Sony CLIE PEG-UX40 Handbook page 177

Locking your CLIÉ handheld with a password (Data protection)
3
Follow "Assigning a password" on page 179 to assign a
password.
4
Tap [Lock & Turn Off].
The System Lockout screen is displayed.
5
Tap [Off & Lock].
Your CLIÉ handheld turns off and locks.
To turn on your CLIÉ handheld, you must enter the correct password.
Protecting your data with a password
177