The Operating System (OS) of a computer is the complex software that actually controls the input, output and storage devices of the computer, as well as acting as an interface between the user and any other software that is installed.
Example of Operating System?
Microsoft Windows XP, Microsoft Windows NT, LINUX and UNIX are different operating systems that can be used to control computers.
What Can Operating System Does?
1. Managing the priorities for each programming task that is running
2. Allocating and keeping track of the memory used for storing programs and data
3. Managing the transfer of data between memory and the backing store
4. Handling input operations from the user and from other input system
5. Handling output operations
6. Managing the system security
Graphical User Interface
sometimes called a WIMP interface (Windows, Icons, Menus, Pointer) The contents of folders (directories) and the output from programs are displayed in rectangular 'windows' which can be moved. Icons (small pictures) are used to represent files or software and the mouse can be used to move the icons, run programs and select options from the menus.
Features of a good GUI?
1. Items are placed in similar positions on different screens.
2. Navigation between screens is easy and consistent with an escape route available to return to a main screen.
3. Text should be easy to read for all users.
Command Line Interface
commands are typed directly into the computer and then the enter button is pressed to run them. The commands must be entered correctly and are often abbreviated. They can be difficult to remember. Example: c:>copy c:\examplefile.doc a: This command would copy a file called 'examplefile.doc' from the hard drive (drive C) to a floppy disk (drive A).
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