Computer Software is all the programs that control the operations of the computer and the service programs, it is embedded in the structure of the computer hardware, a combination of hardware and software forms a usable computing system. Computer Software can be divided into two main type, system software and application software.
* System Software :
This type of programs direct the computer to accomplish specific activities, e.g. word processor, graphics programs, games, etc.
4-2 Windows Operating System
Operating system (O.S.) is a set of inter related programs (software package) that control how the computer works, link its components, control the basic operations of the computer, manage the execution of the programs, and facilitate the communication between the user and the computer machine. Examples of O.S. : DOS system, Windows system, Macintosh system, Unix system, etc. The operating systems developed during periods of time due to the evolution of computers (generations of the computer).
DOS system (Disk Operating System) was the first widely-installed operating system for personal computers. DOS was (and still is) a non-graphical line-oriented command- or menu-driven operating system, with a relatively simple interface but not overly "friendly" user interface. Its prompt to enter a command.