MOUSE
Basic parts
A mouse typically has two buttons: a primary button (usually the left button) and a secondary button (usually the right button). The primary button is the one you will use most often. Most mice also include a scroll wheel between the buttons to help you scroll through documents and webpages more easily. On some mice, the scroll wheel can be pressed to act as a third button. Advanced mice might have additional buttons that can perform other functions.
Pointing, clicking, and dragging
Pointing to an item on the screen means moving your mouse so the pointer appears to be touching the item. When you point to something, a small box often appears that describes the item. For example, when you point to the Recycle Bin on the desktop, a box appears with this information: "Contains the files and folders that you have deleted."
The pointer can change depending on what you're pointing to. For example, when you point to a link in your web browser, the pointer changes from an arrow 
to a hand with a pointing finger 
.
to a hand with a pointing finger .
Most mouse actions combine pointing with pressing one of the mouse buttons. There are four basic ways to use your mouse buttons: clicking, double-clicking, right-clicking, and dragging.
Clicking (single-clicking)
To click an item, point to the item on the screen, and then press and release the primary button (usually the left button).
Clicking is most often used to select (mark) an item or open a menu. This is sometimes called single-clicking or left-clicking.
Double-clicking
To double-click an item, point to the item on the screen, and then click twice quickly. If the two clicks are spaced too far apart, they might be interpreted as two individual clicks rather than as one double-click.
Double-clicking is most often used to open items on your desktop. For example, you can start a program or open a folder by double-clicking its icon on the desktop.
Right-clicking
To right-click an item, point to the item on the screen, and then press and release the secondary button (usually the right button).
Right-clicking an item usually displays a list of things you can do with the item. For example, when you right-click the Recycle Bin on your desktop, Windows displays a menu allowing you to open it, empty it, delete it, or see its properties. If you're ever unsure of what to do with something, right-click it.
Dragging
You can move items around your screen by dragging them. To drag an object, point to the object on the screen, press and hold the primary button, move the object to a new location, and then release the primary button.
Dragging (sometimes called dragging and dropping) is most often used to move files and folders to a different location and to move windows and icons around on your screen.
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