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3. Dragging Movement
First touch your finger on the desired item on the screen and hold it there, then
make a dragging movement. This is similar to the click and drag movement you
can make with a mouse.
4. Rolling Movement
When you move your finger one time vertically (or horizontally) on the touch
screen, this is called a Rolling Operation. For example: 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.