A mouse is an input device that actually looks a 
	little bit like a mouse.The mouse, which has a ball on its 
	underside, is roled on a flat surface, usuallly the desk on 
	which the computer sits. The rolling movement causes a 
	corresponding movement on the screen.Moving the mouse
	allows you to reposition the poiter, or thge cursor, 
	an indicator on the screen that shows where the next 
	interaction with the computer can take place. You can 
	communicate commmands to the computer by pressing a 
	button on top of the mouse. In particular, a mouse 
	button is  often used to click an icon, a pictorial 
	symbol on a screen; the icon represents a computer activity - 
	a command to the computer - so clicking the icon invokes 
	the command.
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