Operating systems have many functions: A user interface is a program, or suite of programs that allows a user to interact with a computer. There are three types of interface to be considered ...

Also called an "executive" or "supervisor," an operating system performs the following functions. Job management controls the time and sequence that applications or utilities are run. For example ...

Operating systems can have different operational modes. This is the way the computer is used and operated. Some operating systems can use more than one operational mode. For example, the engine ...