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5. Rolling Movement
When you move your finger one time vertically (or horizontally) on the touch screen,
this is called a Rolling Operation. This operation is similar to moving the scroll wheel
on the top of a mouse, and produces the same results as the scroll wheel interface
does.
6. Zoom Operation
Touch two fingers lightly on the desired item on the touch screen, then keeping
both fingers on the screen, change the distance between them. By increasing (or
decreasing) the distance, you can perform a zoom out (or zoom in) operation. For
example: you can enlarge or reduce the picture size in Windows Photo Viewer.