Xnest

English: Xnest is an X Window System server that shows its output in a window. In other words, it also acts like a X-Client.

Deutsch: Xnest ist ein X Window System-Server, der sein Display direkt in einem Fenster eines bestehenden X-Servers darstellt.

Screenshots

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  Xnest and Xinerama

Images where Xnest is used

The fact that Xnest can act as a X-Client can be used for multiple purposes, even to create screenshots of X Window System-software that cannot be "photographed" as easy.

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  Xdm in a Xnest
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  Many Windowmanagers in multiple Xnest windows
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  KDM in a Xnest