Dell Latitude XT (Late 2007) - Manual (Page 10)

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Dell Latitude XT Multi-Touch Gestures Upgrade
Two-Fingers Double-Tap Gesture
Tapping the screen twice with two fingers sends an operating system
command that you can configure. It can be used to perform actions, such as
turning the display off and disabling touch gestures (default), or run an
executable program, such as one that opens Internet Explorer.
Sensitivity Setup
To adjust the sensitivity for the two-finger gestures, double-click the N-trig
icon (
)in the system tray, and tap the Multi-Touch Gestures tab. Set the
sliders for each gesture as desired.