Taskbar.
It varies depending on your operating system, but in general the bar along the bottom is the taskbar, the picture you see is called the desktop background, and the programs on the desktop background are called icons.
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The taskbar.
taskbar
It's called 'show desktop' - it tells you that if you hover your cursor over the tiny vertical bar at the right end of the taskbar.
The button is included by default in the Quick Launch menu. Simply right-click the taskbar and select Toolbars > Quick Launch.
I need to find out my primary/secondary DNS address and my gateway address but I cant because of the whole taskbar thing.
Desktop
Its simple. Its on the Taskbar. OR you can go into the start menu and search internet then hit enter
[a]Quick launch [b]Systray [c]Taskbar [d]Time
Actually the wallpaper is just the background screen of the desktop and the desktop is where you can see the taskbar, icons and the wallpaper. Wallpaper is only the background while the desktop is the whole screen including the other things in it (ex: icons, files, windows etc.)