Use The Calendar; Look At The Calendar - Compaq iPAQ H3900 Series Reference Manual

8. Tap the down arrow associated with "Display Today screen if
device is not used for...hours" check box to determine how
many hours must pass before the Today screen displays.
9. Tap OK.

Use the Calendar

You can use the Calendar to schedule appointments and set
reminders. You can view your calendar by
I
Agenda
I
Day
I
Week
I
Month
I
Year
You should keep the amount of information in your appointments
small in order to conserve memory.
Hint: Press the Calendar application button on the Today
screen to navigate quickly to Calendar.

Look at the calendar

By default, the Calendar first appears in the Agenda view. The
Agenda view provides the most detail about your appointments.
From the Start menu, tap Calendar to view your appointments.
Reference Guide
Scheduling
3–5