What determines {default} location of :0, :1 & :2?

[Felix Miata]

On 2013-07-08 19:09 (GMT+0200) Thomas Lübking composed:

> echo $XDG_VTNR
> unset it in doubt
> the interpretation is likely done in /etc/X11/xinit/xserverrc

After finding string XDG_VTNR nowhere grepping through Fedora 19's /etc, I 
repeated in /usr, finding it only in /usr/lib64/security/pam_systemd.so.
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