Start Multiple WM Session On Different tty Number
I never thought of starting a WM / desktop session at a different tty number. But it is possible to do so if you wish. I assume you are using startx or xinit. Here's how:
.xinitrc should look something like this:
You can login to a tty, for example tty2 (CTRL + ALT + F2) then just type "startx".
I hope this helps.