Palm Tungsten W - Manual (Page 377)

Security preferences
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3. Select At a preset time, and then use the arrows to set the time.
4. Press Function + Enter , or tap OK.
To set your handheld to lock after a period of inactivity:
1. Tap the Auto Lock Handheld box.
2. Enter your password.
3. Select After a preset delay.
4. Enter the inactive period, and then select Minute(s) or Hour(s) from the pick list.
5. Press Function + Enter , or tap OK.
Tap to select Minutes or Hours
Enter the amount of time