Dell Studio 15 (1555, Early 2009) - Manual (Page 39)

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Using Your Studio Laptop
Touch Screen Gestures
NOTE: Some of these gestures may not work outside the Dell Touch Zone.
Zoom
Allows you to increase or decrease the
magnification of the screen content.
Pinch — Allows you to zoom in or zoom out
by moving two fingers apart or bringing them
closer together on the screen.
To zoom in:
Move two fingers apart
to zoom in on the active
window.
To zoom out:
Move two fingers close
together to zoom out on the
active window.
Dwell
Allows you to access additional information by
simulating a right‑click.
Press and hold a finger on
the touch screen to open
context‑sensitive menus.