Running cwm and fvwm at the same time?

[Alexander Hall]

Hi!

I'm just curious how come it its possible to start (and run) cwm at the 
same time as running fvwm (from base). AFAIK a window manager normally 
cannot (or refuses to) run if another window manager is already in use. 
Is this only a courtsey from the second window manager? I thought there 
were limitations in X that forced this behaviour.

Anyway, I'd expect cwm to behave that way, too, but please feel free to 
explain to me why I'm wrong.

I also meant to ask about key bindings, but after finding a new part in 
the man pages, I realize I have to test a few things first. (Yes, it was 
quite a while since I last had a look at cwm) :-)

/Alexander