how to different xsessions for different monitors
 

I (believe I) saw a walk-through some days ago for have different monitors run in different X sessions in different virtual terminals. (But I can't find it.)
I have an Nvidia 8500 and everything is fine. I would like to be able to run different Xsessions in different terminals through configuration of Xorg.conf so that if I type 'alt-ctrl-F7' I go to the CRT and so that I type 'alt-ctrl-F8' it goes to the projector.