Asus E7169 - Manual (Page 58)

58 Notebook PC User Manual
To rotate an image, place two fingers on the touchpad then turn one
finger clockwise or counterclockwise while the other stays still.
To enable continuous scrolling, hold your fingers on the edge of
the touchpad when moving from up to down or left to right and
vice versa. The mouse pointer changes to a double-headed arrow
pointer when continuous scrolling is activated.
Bring together or spread apart two fingers to zoom in or out.
Rotating - Rotating images clockwise or counterclockwise is done
on the touchpad by using two fingers.
Scrolling - Using two fingers on the touchpad, you can scroll through
lists vertically and horizontally.
Zooming - Using two fingers on the touchpad, you can enlarge or
reduce the view size of your selected image.