Just for others that may be looking to add or change stuff to the
/home/knoppix/Desktop. The /home/knoppix/ directory is only created
in the miniroot.gz linuxrc file (see previous post sorry ).

A lot of stuff happens at:
/etc/X11/Xsession.d/45xsession

found from:
http://knoppix.net/forum/viewtopic.php?t=352

ciao
ted