The Desktop is the on-screen work area on which windows appear, it’s the first screen that appears when the operating system has initialized. In our case it will be the Windows XP desktop. This desktop is very similar to other operating systems from Windows such Windows 95, Windows 98, Windows NT, Windows 2000. Get to know the Desktop of Windows XP

When the user clicks on Desktop icon correspondent program is open. Just like if user click on My Computer icon it will open on user Desktop.
The Bars and Start Button

Task Bar is appears on the bottom of your computer screen . On taskbar, left corner having the Start button. In the area of shortcut it shows the program running and last notification area.