1. Is a program that acts as an intermediary between the user of the devices, which are cut by CO computer and applications (programs) which it runs are used by the last. Operating system provides 3 interfaces: the user interface User Interface and interface devices (or the so-called ID services) Drivers and applications interface API.

2. Broken apart and the operating system is programmatically to Sections except: Kernel (Kernel) * Memory management * Manage the processor CPU * File system

3. Are many kinds of the most famous Linux and Windows, Linux and Windows and Macintosh and Unix Macintosh Unix and other

4. User Interface The exposed part of the user of the operating system interfaces and more prevalent is the graphical interface, which is characterized by colors and shapes, menus, and icons such as graphical interfaces for Linux, such as KDE and GNOME. There are interfaces where the text is often a black screen and deal with the command line. Graphical interfaces that are more widespread than others because of their ease of use and the many possibilities available through which to connect to the system and other programs. Thus any of these interfaces is the intermediary between the user and the computer.

5. Definitions Hardware Device Drivers The objective of this program is to run all (or some) features one of the components of the computer hard - Hardware - the operating system. For example, if I bought a graphics card - Graphics Accelerator - new and you are working on what operating system you have to download and prove driver for this card and specially designed for this system so you can take advantage of all the possibilities of the card and in order to be able to run your games favorite computer. In most cases these programs are in the group of programs that come with the operating system (Linux for example) do not need to be downloaded from Egypt last.

6. Interface Application Interface applications Applications need to use certain ways to enable them to memory management and access to files and display images on the screen and other basic needs of the many. Alcegl system shall provide such methods (called functions) which you can use applications that the user perform these operations. In other words this provides the interface for software developers and applications a set of basic functions that are frequently used for functions such as memory management and graphical functions, functions to manage files and others. This interface facilitates the work of the programmer as it provides him to do these tasks in programs that are written.

7. Operating system functions Operating system and essential functions in computer work such as: * Organize your user files on many of the storage media (Storage Media) Kalqrs steel, the CD-ROM (CDROM). It also depends on each operating system file system (File System) of its own. For example, most systems adopt the Microsoft Windows operating system on the new NTFS, and supports many of the distributions of the Linux operating system on a system ext2, 3. * Organize your programs installed on the computer where you can run more than one program at the same time, however, does not overlap or errors and uses the respective RAM memory RAM and processor a certain percentage. * And also controls the input and output of pieces of equipment (hardware) related, Such as screenand printer and keyboard... etc.. The identification of spare hardware and the availability of the possibilities of these pieces of software that you use. * Handle errors spare hardware, software, and to avoid loss of information.