It doesn’t matter how many windows you have open, you can always minimize them all at once by clicking the Show Desktop button in the Quick Launch part of the taskbar in Windows XP. You can click the Show Desktop button again to restore all of your windows.

Quick Launch

Note: If you don’t see the Show Desktop button, right–click an empty part of the taskbar, point to Toolbars, and make sure Quick Launch is checked. If it’s not, then click it. The show Desktop icon is normally located to the right of the Start button. In this case it’s the 4th icon to the right of the Start button

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