This site is the personal wiki of Christian Neukirchen. Unless you are interested in his notes, you probably want to visit his real web site at http://chneukirchen.org.
This site used to run on a complex, confusing, unmaintainable, and tangled hierarchic hypertext system called Enid, but as of January 2009 it has been flattened and all non-Enid-specific content has been ported to vuxi, a tiny Wiki.
vuxu.org also runs some other services that may be interesting for you.
See a list of my boxes.