Several X servers w/different WM's simultaneously?

[Robert Lorentz]

I am trying to run 2 separate X servers with different WM's via 2 video 
cards and 2 monitors, one server on each.  This works fine launching 
both from console; but only ONE will display at a time, depending on 
which one I have 'focused' on via control-alt-shift F7 / F8.  This makes 
sense on single monitor display, X wouldn't want to bother drawing its 
screen if you are not able to view it at all.. but in a multiple monitor 
environment, this doesn't make sense.  Is there any way I can 'fix' this 
behavior so that both screens will actively display at all times?  Note 
- the keyboard and mouse are only required to work in one of the X servers.

Thank you,

Robert Lorentz