What is pointing stick, joystick and touch screen?
A pointing stick is a pressure-sensitive pointing device. It looks like a pencil
eraser. It exists between keys of keyboard. It is used to control the movement
of a pointer on the screen. The pointer on the screen moves in the direction in
which the pointing stick is pushed, Pointing stick input device is normally used
with laptop computers.
Joystick is a pointing device. It consists of a vertical handle or handheld
stick. The stick is mounted on a base. The handheld stick is used to control the
movement of pointer on the screen. Joystick is basically used to play video
games. It is also used in some computer-aided design (CAD) systems.
A touch screen is a special video display screen. Input is given to the computer directly by touching the screen with user fingertip. Most touch screen computers use sensors in the computer's screen to detect the touch of a finger. Touch
screen is often used in ATM. Touch screen systems are also used in restaurants,
supermarkets, departmental stores etc.
Puck is an input device. It looks like a mouse. Puck is also called cursor.
Usually, it is generally used for tracing old images.