2. Operating Systems First Program to load. Controls Hardware And software. Enable User to operate PC( Personal Computer) –Examples: DOS: Disk Operating System Windows: It’s a GUI (Graphical User Interface) System –GUI: is a system that uses graphics( icons, windows, mouse, pointer, colors) to operate pc. Linux Unix Mac: Macintosh

3. Windows Operating System Windows Interface (2) Icons (1) Background (3)Taskbar

4. Desktop Icons There are 5 main icons: –My documents –My computer –My Network places –Internet Explorer –Recycle Bin

5. 1- Desktop (Display) Properties Is used to change Background, Screen saver, Screen resolution. Right Click on desktop → Properties

6. 1-Right click on Desktop Tabs Dialog Box Title bar

7. 1-Background From display properties select desktop tab Chooses Background Ok

8. 2- Screen saver Choose screen saver Set Time ok Then press ok

9. settings From settings you can change screen resolutions Drag this curser left and right ok Then press ok

10. System Properties Right click on my computer → properties From this Dialog box you can find out: 4-Size of RAM 3-Speed Of Processor 2-Type of the processor (C.P.U) 1-Type of operating system

11. Window Bars Title Bar Menu Bar Standard Button Bar Address Bar Task Pane Status Bar Scroll Bar

12. Title bar buttons MinimizeRestore Down/ Maximize Close Minimize (make window small) as a button on the task bar Control the sizing of the window To close the window

13. Explorer Window You can get this window by: 1.Right click on the icon → explorer 2.Select the [Folders] icon on the toolbar It contains two sides: –left hand pane (Folders pane) contains a ‘folders tree’, Showing how the drives and folders linked together. –right hand pane (Contents pane) shows the folders and files contained in the drive or folder currently selected in the Folders pane

14. Contents pane (Right pane) Folders pane (Left pane)