There should be something on the freedesktop.org website. try http://www.freedesktop.org/software/systemd/man/udev.html I'm not sure how much detail that has, but it does give at least a basic description of how it all works. ~Kyle http://kyle.tk/ -- "Kyle? ... She calls her cake, Kyle?" Out of This World, season 2 episode 21 - "The Amazing Evie"