Comment 16 for bug 213149

The best page I've found to explain what is 'ck-launch-session' is :
- http://wiki.archlinux.fr/systeme:consolekit (in French)
- http://translate.google.fr/translate?u=http%3A%2F%2Fwiki.archlinux.fr%2Fsysteme%3Aconsolekit&sl=fr&tl=en&hl=fr&ie=UTF-8 (in English)

I do not understand what you are saying about MPD.
The original description of this bug do not talk about MPD but about the fact that sound isn't shared between sessions of the same user (tty7 and tty1-6).