graphical through applications defined interact boot command use loaded requests An operating system (sometimes abbreviated as “OS) is the program that, after being initially ( 1 ) into the computer by a ( 2 ) program, manages all the other programs in a computer. The other programs are called ( 3 ) or application programs. The application programs make ( 4 ) of the operating system by making ( 5 ) for services through a ( 6 ) application program interface (API). In addition, users can ( 7 ) directly with the operating system ( 8 ) a user interface such as a ( 9 ) language or a ( 10 ) user interface (GUI).