Depth

Since windows are allowed to overlap in X, there is a concept of depth. Even though the windows and the screen are both two dimensional, one window can be in front of another, partially or completely obscuring the rear window.

There are several operations that deal with depth:

• Raising the window, or bringing a window to the front. This is usually accomplished by clicking on a window's title bar with one of the buttons. Depending on how the window manager is configured, it could be any one of the buttons. (It is also possible that more then one button will do the job.)
• Lowering the window, or pushing the window to the back. This can generally be accomplished by a different click in the title bar. It is also possible to configure some window managers so that one click will bring the window foward if there is anything over it, while that same click will lower it when it is in the front.
• Cycling through windows is another operation many window managers allow. This brings each window to the front in an orderly cycle.