Fifth in the series of Linuxes that run as screeensavers for Microsoft Windows comes Freeduc-PhysChim.
This comes as a pair of screensavers, 'FreeducPhysChim' which offers network access and is good for home use, and 'FreeducPhysChim-NoNet' which isolates the unattended computer from the network and so is maybe more suitable in a corporate environment.
Unpack QemuSaver-FreeducPhyschim.zip on a Microsoft Windows system and run its setup program. Then go to the Windows screensaver menu and select the FreeducPhysChim or FreeducPhysChim-NoNet entry. Then sit back, wait, and enjoy.
To close down the screensaver, either do a KDE shutdown, or press Ctrl-Alt-Del and bring up the Windows Task Manager to do the job.