In the X window system, a window manager controls the way your desktop works, including how the windows look and act.

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How to identify which xterm a shell or process is running in?

I usually use long running X sessions with several virtual desktops and many many xterms. I also use job control in the shell (zsh). Sometimes I wish I could identify an xterm a shell or process is ...
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The most light-weight Compiz compatible environment?

I require Compiz for organizational reasons; I make heavy use of its window sorting features. But I like light-weight environments so that I can give as much of my system's resources to the ...
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What are the user interface subsystems, their components and responsibilities?

I am trying to understand the different subsystems that are in charge of the user interface, the terminology to refer to them, and how they are structured; so far I know there are: At the top level: ...