It reminds me of FVWM, but I&#x27;m not sure. Last time I used that was 10 years ago in a (back then) 10 year old computer which barely had any RAM.<p>Edit: with a bit of research, I found it could be Mwm (or a derivative&#x2F;predecessor?). In the Wikipedia article what struck me the most was the &quot;Compliance&quot; section: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Motif_Window_Manager#Compliance" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Motif_Window_Manager#Complianc...</a>