When you open the System Properties dialog box, select the Hardware tab, and click the Device Manager button, you open one of Windows' most important utilities—the Device Manager. You use the Device Manager to view key properties for any device installed on your PC, and change those properties as necessary.
NOTE
If you're familiar with the Device Manager from Windows 9X/Me, you might be surprised at its slightly different look in Windows XP—as well as its new location. (It used to be a tab on the System Properties dialog box, now you have to click a button to get to it.)