Pointing device

Pointing Device
The kind of direct entry input device known as pointing device.

MOUSE
A mouse is a small, hand-operated device that is connected by cable to the computer and that moves the cursor on the display screens. As you move the move  the mouse around the desktop, the cursor moves across the screen. When the cursor reaches your desired location, you may push a button on the mouse to signal a command to the computer.

>TRACK BALL
A track ball is pointer device resembling a mouse but is stationary and is guided by the fingers intead of rolled on the desktop. Some computers have built-in track balls. Track balls may also appear on the side of computer keyboard. These devices are useful in situations where there is no room to move a mouse, as in the airplanes.

JOYSTICK
A joystick usually used to play games on computer. It is a device that controls the movement of certain object on the screen. The buttons on the joystick allow the users to perform different actions on the nature of the program.

TOUCH SCREEN
A Touch screen is a special type of computer display screen that allows commands to be entered by the users touching screen. Labeled boxes on the screen display choices available to the users.

LIGHT PEN
The light pen consists of a light-sensitive pen like device that enters commands into a special display screen when the users touch the screen with pen. Light pens are frequently used by graphic designers and drafting engineers.

DIGITISING TABLET
A digitizing tablet, or digitizer, consists of a flat drawing surface and a pointing tool, which creates images that are converted to computers usable form. The tablet which is covered by a grid of tiny wires, is connected by cable to the computers

PEN BASED COMPUTER
Pen based computers allow users to write on the screen of the computer, which than interprets the hand-writing and displays the result on the screen in printed form. Users can edit what they have entered and give commands by circling words, checking boxes, and using symbols developed by the manufacturer.