Hi all, I've posted this question to comp.text.tex, and they've suggested to take a look at LuaTeX. So I forwarded the message to the User mailing list, but probably this one is more appropriate. If not, excuse me! I'm trying to find *at runtime* all the symbols allowed in a latex environment. So, given a tex file, I'd like to access - the complete predefined commands/symbols/definitions; - the complete list of commands/symbols/definitions defined in packages. So, the predefined language list would include \LaTeX, \def, \newcommand, ~, \usepackage, and so on. I've been informed that this is a naive view, since there are lots of other commands such as \@ and similars, and a simple match with a \ would be unrealistic (e.g., anything beginning with a \ is a command). When including a package, for example graphicx, I expect to find a way to have \includegraphics and its siblings. Again, packages may mess up a little bit. The best would be having commands along with their options, but I don't know if this is possible. One thing I'd like to avoid: creating my own parser. Why on earth should I create a parser when latex knows more than me (or everyone else) what symbols and commands it knows? The suggestions from the newsgroup is that *maybe* LuaTeX gives a way to access all TeX's macro hash table. If so, I'd be really happy. Thanks & Cheers!