[..] >> So, I think, that the correct way to solve this problem is to >> set the values of \lccode, \uccode, \sfcode and \mathcode, >> in a macros which switches to a language (\selectlanguage >> in Babel). >> Are there some ready means to preserve the `language environment' >> before switching to another language and to restore it after >> changing back (or to some third language)? >> Is it a normal practice to `tune' \lccode, \uccode, \sfcode >> and \mathcode values in a language-switching mechanism? One idea under consideration for e-TeX V2 is the option to save and restore an entire set of register values (e.g. the current set of lccodes, etc); this may prove useful in solutions to this question. Philip Taylor, Technical Director, e-TeX/NTS projects.