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Keywords from Image Description:
XephyrIceWMFluxboxLinuxMint. An IceWM Xephyr session is running inside Fluxbox Xephyr session which is running inside another IceWM Xephyr session which is running under Linux Mint Note that Fluxbox is also under the MIT by the Fluxbox developers but IceWM is released under the GPL and LGPL by Marko Maek Own Org Foundation Window