Run multiple X sessions in Linux

# startx — :1
# startx — :2 Ctrol+Alt+F8-F9/F10 etc

Run firefox in vt08 from vt07
# firefox –display :1

To run multiple X sessions automatically:
# vi /etc/X11/gdm/gdm.conf
Locate [Server] and add:
0=standard
1=standard
2=standard
:wq
This gives 2 additional sessions.