Juniper Allegro CE Owner's Manual page 100

Stylus
The Stylus Properties applet uses the Double-Tap tab to set up and test
the double-tap sensitivity for speed and distance between taps.
From the Calibration tab, the touchscreen is recalibrated. If you have
trouble selecting an item when you tap on it, the touchscreen may
need to be recalibrated.
The Recalibrate option can be accessed from the Recalibrate button and
may be accessed if the Allegro has been without any batteries for
longer than 15 minutes and without saving the system.
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