The other two files, 'olwm' and 'mwm' contain three xwininfo(1)
entries,
the first was taken from Ink -> New Document, the second is Terminal
and
the third is a plain xterm.
What I did was to use each window manager's maximize window option.
As you can see, the two GNUstep applications are WAAAAY off, resulting
in LOTS of XShm memory errors bringing the whole machine to a crawl...
I tried the same with several other WMs, including BlackBox and
AfterStep, and neither of these show the same behaviour.
As I said, probably no one is still using mwm and/or ol(v)wm, but I
thought I'd pass this on anyway...