Stef Epardaud <stef(a)lunatech.com&gt; writes: Note that XEmacs is not a very easy piece of C code. It's a good idea to hone your C skills on something smaller before embarking on the XEmacs journey. Having said that, I'll also say that most of XEmacs is very nicely written and that, once you find your way around the code, it is not hard to read. I've also found XEmacs very modular, even when that modularity is not visible to the outside. It is quite possible to change (fix or improve) one part of it without understanding or knowing about the other parts. It takes a few months.