Mac OS X native windows
To close an inactive window without bringing it to the foreground, Command-click the Close Window button.
To move an inactive window, Command-drag the window's title bar.
Note: "Command" refers to the key on your keyboard that is marked with an Apple icon.
Classic environment windows
You can use the above commands for Classic windows while in the Classic environment, or for native Mac OS X windows while in the Classic environment.
However, if you are not in a Classic application, Command-clicking or dragging a background Classic window will make the window active (bring it to the foreground).