Dell Inspiron 17R Reference Manual page 134

Scroll Vertical — Allows you to scroll up or scroll down on the active window.
Move a finger up or down to activate vertical scrolling.
Scroll Horizontal — Allows you to scroll right or left on the active window.
Move a finger to the right or left to activate horizontal scrolling.
Rotate
Allows you to rotate the active content on the screen.
Twist — Allows you to rotate the active content using two fingers.
Keeping a finger or thumb in place, move the other finger in an arced direction right or left.
You can also rotate the active content by moving both the fingers in a circular motion.
Related Information
Touch Screen Display
Using Touch Screen Display
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