<P> An operating system ( OS ) is system software that manages computer hardware and software resources and provides common services for computer programs . </P>
<P> An operating system ( OS ) is system software that manages computer hardware and software resources and provides common services for computer programs . </P>
the primary job of the operating system is to manage
the primary job of the operating system is to manage
computer hardware and software resources and provides common services for computer programs
computer hardware and software resources and provides common services for computer programs