1. Windows

2. Windows operating system started with the introduction of Windows Operating System.
Windows is an operating environment and it is developed by Microsoft Corporation.

3. Versions of Windows Windows 3.0 Windows 3.1 Windows 95 Windows 98
Window Millennium
Windows NT
Windows XP
Windows Server
Windows Vista
Windows 7

4. Components of Windows Desktop Icons My Computer Network Neighbourhood
The Internet
Recycle Bin

5. Opening Window
Double-click the icon (or) Just point to the icon and right-click once, and select open option from the shortcut menu.
Change windows sizes with desire size place the mouse pointer on the portion of the border that you want to resize: left or right side, top or bottom.
To move a window, point at the windows title bar, press and hold the mouse button, and drag the window to its new location

6. WordPad WordPad is a word processing application in accessories group.
Write memos, letter, documents, with text and graphics.

7. MS Paint MS Paint is an application in accessories group.
It is a graphics tool for constructing pictures.
Tool box has several basic tools which can be used to draw the pictures
MS Paint pictures is saved as a bit map file (BMP).

8. Clock
Clock is a small programme in accessories which displays the current system time and system date.
There are two types of clock - analog and digital.
Analog display, the clock is represented as a picture, however in digital mode the time and date is in digits.

9. Calculator similar to real life calculator
There are two type of calculator - standard and scientific.
Calculator result can be copied to clipboard using copy option in edit menu.

10. Control Panel
Control is used to change system settings (Screen, keyboard, mouse, Date, Time...etc.
Click the start button and then Choose Settings, Control Panel

11. Windows Explorer Used to view and organize drives, folders and files.
The list of drives and folders is on the left, and the contents of the selected folder or drive is on the right.
To close the windows Explorer, Choose Close option from File menu or click the Close button on the title bar or press Alt F4.

12. Linux Linux is the first truly free Unix-like operating system.
Unix-compatible operating system called GNU.
Linux is considered to be more secure and stable.
Linux is known as an open source operating system and also called free software

13. Understanding Linux It manages the resources of Linux such as:
File management
Multitasking
Memory management
I/O management
Process management
Device management
Networking support including IPv4 and IPv6
Advanced features such as virtual memory, shared libraries, demand loading, shared copy-on-write executable etc.