Computer Mouses that existed at this time, beside have buttons for left click and right click also have button on their scrolling wheel, that have a special function.
The functions of button click on the Scroll wheel :
• When you are opening a document that contains multiple pages, or opening a website, to view the page up or down, simply by clicking / pressing the scroll wheel button of the mouse, then move the mouse up or down (depending on needs), then display the page will automatically move by itself. The speed when you move the mouse will affect the speed, fast or slow displaying movement of the page.
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