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We mentioned .xsession because some remote desktop mechanisms and display managers like xrdp will use that file instead. Salient if you, say, want piRIX to be available from your login screen.
The executable will in be that directory. Follow the same pattern for any of the other demos. The Toolchest (well, the thing that must serve for it) has menu items to launch them, provided you put the executable in your search path.
Actually it ought to work in many other Linux contexts, like clan Debian or clan Fedora. There have been minor problems with OpenBSD but we hear it still works. @rhaleblian even got it working in WSL2 and X410.
This hackamadoodle really just sets resources for mwm so that you get that particular CDE-like feeling. So if your whatever-NIX has mwm you're mostly there.
SGI's Indigo Magic Desktop and Interactive Desktop seem to bear similaries to CDE and Motif, being a derivation; accordingly, this tweak bases itself on mwm at el.
