-pointing with a mouse. a mouse is a device that is moved by hade over a flat surface.as the ball on its underside rotates,the mouse movement causes correspondind movement of a pointer on the computer screen.pressing buttons on the mouse lets you slect commands.
-scanning with a wand reader or bar-code reader.these devices,which you have seen used by clerks in retail stores,use laser beams to read special letters,numbers,or symbols such as the zebra-striped bar codes found on many products.