The computer's master control program. When a computer is turned on, a small "boot program" loads the operating system. Although additional system modules may be loaded as needed, the main part ...

Each connected device has its own driver. Application programs and hardware can communicate through an interface provided by the operating system. This is known as the application programs ...

Applications run in windows and all objects (apps, hardware and files ... commands it is quicker to use a CLI to manage the operating system than to go through many menu levels.