[texhax] Programming Latex

[Robin Fairbairns]

> > I was wondering if someone could give me some links to
> > websites on Programming Latex (internally) or
> > recommend any books on the subject.
> 
> What do you mean by programming?  Anyway, try googling LaTeX.

and find your way through 500 000 hits, a good proportion of which are
from alt.revolting.*?

in response to the op's question -- take a look at

http://www.tex.ac.uk/cgi-bin/texfaq2html?label=writecls

which shows all i know of (not much).  i have this long term aim to
produce a web site with descriptions of latex internals functions, but
at the rate i'm going, latex 3 will be old hat by the time i've
completed the documentation of 2e.

(still, i'll be retired by then.  'll give me something to do, won't
it?)