Alright, I'll make it as easier as it gets.

Suppose you have 2 or 3 or x numbers of Window Manager or Desktop Environments.

And you want to run more than 1 WM Or DE at the same time, on different "ttys"

1) Create a new username.

2) touch .xinitrc (if you dont have it in your new usersname's home dir.

3) Add the name of your WM or DE that you wish this username to run. ONLY 1 DE/WM per .xinitrc per username .

4) jump to tty1 for example : ctrl + alt +F1, login to the username you created the .xinitrc and added the line of the WM/DE and type: startx -- :1 <--- :1 refers to create a new X Session on tty8 this happens if tty7 is occupied by an already running manager from different user.

I have E17 WM and Gnome DE running on Ubuntu Hardy.

Hints:

If I have e17 already running on tty7, and I want GNOME to run on tty8, thats what I do.

leblinux@home:~$>sudo adduser test

leblinux@home:~$> sudo passwd test

leblinux@home:~$> su test

test@home:~$> touch /home/test/.xinitrc

test@home:~$> echo "gnome-session" > /home/test/,xinitrc

test@home:~$> startx -- :1 &

voil!!!!! jump by ctrl+alt+F8 for example and you will see a running GNOME SESSION!

for enlightenment, add a line to .xinitrc : enlightenment_start

Enjoy!!!!!