Pointing Devices
Track Ball:
It is used as an alternative to mouse.
It has a rotating ball at the top which canbe rolled with
fingers.
The position of the cursor on the screen changes with
rolling the ball with fingers.
It has buttons similar to that of the mouse.
It Is more useful than mouse because it takes less space
than moving the mouse.
Touch Pad:
This is a small flat surface on laptop on which user can
adjust the position of cursor on the screen by movement of his fingers.
It also has two buttons that have the same function as the
right and left buttons of the mouse.
Touch Screen :
This is a video display screen that receives input from
touch of finger.
The screen is covered with a plastic layer.There are invisible
beams of infrared light behind the screen.
The user enters the data by touching icons or menus on the
screen.
Most touch screen computers use sensors to detect the touch
of a finger.
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