Xephyr

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Reason: Mention how this can be used against keylogging attacks [1], mention layers like gdm (Discuss in Talk:Xephyr#)

Xephyr is a nested X server that runs as an X application.

Installation

xorg-server-xephyr is available from official repositories. Install it with pacman.

Execution

If you wish to run a nested X window, you'll need to specify a display.

$ Xephyr -br -ac -noreset -screen 800x600 :1

This will launch a new Xephyr window with a DISPLAY of ":1". In order to launch an application in that window, you would need to specify that display.

$ DISPLAY=:1 xterm

If you want to launch another WM, spectrwm for example, you would type:

$ DISPLAY=:1 spectrwm

You can also launch Xephyr with your xinitrc using startx:

 $ startx -- /usr/bin/Xephyr :1