Finding out how many displays attached to computer (Sophie? Ffenestri?)

Hi,

I want to use OSProcess to launch a VNC server.  If multiple monitors  
are attached to the computer, I want the VNC server to display the  
monitor that Squeak is not on (I'll need to generate the appropriate  
command-line argument from within Squeak).  Has anyone (Sophie?  
Ffenestri?) done any work to make Squeak aware of how many displays  
are available, and which one Squeak is running on?

The desired platforms are (in order of decreasing importance)  
Windows, OS X, and Linux.

Thanks,
Josh