A mouse is a small device that a computer user pushes across
a desk surface in order to point to a place on a display screen and to select
one or more actions to take from that position.
A mouse consists of a metal or plastic housing or casing, a
ball that sticks out of the bottom of the casing and is rolled on a flat
surface, one or more buttons on the top of the casing, and a cable that
connects the mouse to the computer. As the ball is moved over the surface in
any direction, a sensor sends impulses to the computer that causes a
mouse-responsive program to reposition a visible indicator (called a cursor) on
the display screen. The positioning is relative to some variable starting
place. Viewing the cursor's present position, the user readjusts the position
by moving the mouse.
The most conventional kind of mouse has two buttons on top:
the left one is used most frequently. In the Windows operating systems, it lets
the user click once to send a "Select" indication that provides the
user with feedback that a particular position has been selected for further
action. The next click on a selected position or two quick clicks on it causes
a particular action to take place on the selected object. For example, in
Windows operating systems, it causes a program associated with that object to
be started. The second button, on the right, usually provides some
less-frequently needed capability. For example, when viewing a Web page, you
can click on an image to get a popup menu that, among other things, lets you
save the image on your hard disk. Some mouses have a third button for
additional capabilities. Some mouse manufacturers also provide a version for
left-handed people.
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