with the system and application software which are installed and function in OS. Likewise for the hardware such as Keyboard, printers, mouse, CPU, registers, disks, monitors, RAM and other I/O devices to be functional they need an operating system in which their systems are embedded (fig. 1 shows the interaction)
Figure 1: Interactions between hardware, OS, and user interface
Where does the OS fit in?
On an ordinary computer, the operating system does permanently reside on the hard disk. It is then