Koalas to the Max dot Com. How to Unlock a Computer Without a Password Reset Disk. What is an Operating System?& - StumbleUpon. Not all computers have operating systems.
The computer that controls the microwave oven in your kitchen, for example, doesn't need an operating system. It has one set of tasks to perform, very straightforward input to expect (a numbered keypad and a few pre-set buttons) and simple, never-changing hardware to control.