or
On Debian:
* 0 System Halt * 1 Single user * 2 Full multi-user mode (Default) * 3-5 Same as 2 * 6 System Reboot
RedHat Derived Distros:
* 0 halt, * 1/S single user, * 2 boot without networking or X * 3 boot without X, but with networking * 4 Unused * 5 boot with networking+X (Default) * 6 reboot
http://www.debian-administration.org/articles/212
No page links to RunlevelNotes.