Pointing Devices
Pointing devices allow end users to issue commands or make choices by moving a cursor on the display screen. Pointing devices allow the user to easily choose from menu selections and icon displays using point-and-click or point-and-drag methods.

Icons - are small figures that look like familiar devices. e.g. file folder, wastebasket, calculator, calender etc. Using icons helps simplify computer use since they are easier to use with point devices than menus and other text-based displays.   Examples of pointing devices are:  1. electronic mouse 2. trackball 3. point stick 4. touch-sensitive screens

Electronic Mouse: is a device used to move the cursor on the screen, as well as to issue commands and make icon and menu selections.

Trackball: is a device used to move the cursor on the display screen.

Point Stick: is a small button like device, sometimes likened to the eraser head of a pencil. The cursor moves in the direction of the pressure you place on the trackpoint.

Touch-Sensitive Screens: is a device that accepts data input by the placement of a finger on or close to the CRT screen.

Pen-Based Computing:  End users can write or draw directly on a video screen or on other surfaces using a variety of pen like devices. Light pen and graphics pad technologies are being used in a new generation of pen-based personal computers and personal digital assistants that recognize handwriting.

Light Pen - A photo electronic device that allows data to be entered are altered on the face of a video display terminal.

Graphics Tablet - A device that allows an end user to draw or write on a pressure sensitive tablet and have their handwriting or graphics digitized by the computer and accepted as input.

source: Business Computing

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