Hi. I read an email that says that it is better to put a suffix to the command to remember the argument type. I ask to my friends (my friends are physics students thar are learning LaTeX) and they think that it isn't good idea. I like LaTeX as is, in fact I amn't a TeXpert maybe I am a TeXnician, but I want to learn all about LaTeX. I subscribe to this group thinking that you discuss how to program any thing, and send the macros, then I can learn from the experts. In Mexico nobody (who I know) has the TeXbook (except the source code, but is ilegal to print it) and the same if for The LaTeX companion, I am learning reading the source code for some packages, but there are too much commands that I cant imagine ist function or its syntax. However I am working to learn as much as I can and have time because I like very much LaTeX and hate MS-Windows (also winword). SALUDOS ALFVARO SALUDOS ALVARO