This article is from the the Brief Linux FAQ (BLFAQ) Maintained by Neil Zanella nzanella@ganymede.cs.mun.ca
If you wanted to run 6 virtual consoles accessible by pressing the keys <ctrl><alt><F7> through <ctrl><alt><F12> then you could put the following entries in the file /usr/X11R6/lib/X11/xdm/Xservers
:0 local /usr/X11R6/bin/X vt07 :0 :1 local /usr/X11R6/bin/X vt08 :1 :2 local /usr/X11R6/bin/X vt09 :2 :3 local /usr/X11R6/bin/X vt10 :3 :4 local /usr/X11R6/bin/X vt11 :4 :5 local /usr/X11R6/bin/X vt12 :5
I would limit myself to only a few of these though as X seems to eat up quite a lot of memory when multiple displays are running.
 
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