I think he run it under a VirtualDeskop mode, where its physical screen would be smaller than the X11 video mode, thus, having to scroll up and down to show the full Fvwm Pages.

Thanks, I had forgotten that mode, but I remember it now.

In those days as I recall setting X to work at a good resolution was sometimes much more painful than it had to be. Since the 2000s (after the fork to Xorg for example) autoconfig got a lot better. I seem to recall it was possible to trigger a config that would give you a very low physical resolution but high res virtual desktop.