Since Linux is such a multi user system...
Ctrl Alt F1 through F6 are Consoles... Ctrl alt F7 through F12 are X session displays (meaning i can have more then 1 X server running.. having 2 users running in X but one is in gnome and one is in kde so you can switch back and fourth)
the default X server is on display 0 which is Ctrl alt F7... by pressing that will you bring back into the default X display
hope that helps!!
-bolero
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