Note: not available in all versions.
If a field has its Alarm checkbox checked, then the associated field is checked against the current time, date or date and time, as appropriate for the field date type. If the current time or date is past the entered value then an alarm window will display just prior to the associated badge being displayed. Only Time, Date or Timestamp fields have a check box.
For Time fields the alarm box will appear every day the badge is displayed and the current time is past the entered value. For Date fields the alarm box will show when the current date is past the entered value. For Timestamp fields the alarm box will show when the current date and time is past the entered data.