System" software serves as the interface between the user, the application software , and the computers hard ware (figure 3-2). To use application software , such as a word processing program, your computer must be running system software--- specifically , an operting system . Four personal computer operating systems are windows vista, windows xp, linux, and Mac os X.
Each time u start a computer , the operating system is loaded (copied ) from the computers hand disk in to memory . Once the operating system is loaded, it coordinates all the activities of the computer. This includes starting data among input and output devices and memory. while the computer is running , the operating system remain in memory.
Figre 3-2 auser dose not communicate directly with the computer hardware. Instead system software is the interface between the user, the application software, and the hardware. For example , when a user instructs the application software to print , the application software sends the print instruction to the system software , which in turn sends the print instruction to the hardware. Microsoft Windows XP Professional Full Version with SP2
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