Palm Tungsten T2 Handbook page 444

Chapter 22 Setting Preferences for Your Handheld
To set your handheld to lock at a preset time:
Tap the Auto Lock Handheld box.
1.
Enter your password.
2.
Select At a preset time, and then use the arrows to set the time.
3.
Tap OK.
4.
NOTE
To set your handheld to lock after a period of inactivity:
Tap the Auto Lock Handheld box.
1.
Enter your password.
2.
430
Turn off and then turn on your handheld to enable this change.
Tap here
Select At a
preset time
Tap here