You can run an indefinite number of consoles/window managers. Usually limited by the number of F keys though
This is defined in /etc/inittab as well.
No, 1 user logged in per console works. So the same user could be logged in on all 6 different consoles (my systems all have 6 defined by default, not 7) and startx from each (however this is normally a waste of time because of virtual desktops).
To startx on seperate consoles, login, and for the first one it's just:
startx
For the next it's:
startx -- :1
And so on:
startx -- :2
There is a space in there, here's how it would look:
startx[space]--[space]:3
Up to the number of F keys you have, or the number of consoles you have defined, whichever comes first. Something else to try:
startx &
This will startx and drop you back to a console (IIRC, haven't used it for quite a while), very nice if you are in need of another one.
Cool