Two maybe related questions: 1. What constitutes a module? I wrote a couple of definitions and put them in a file t-foo.tex. When I write "\input t-foo" in the preamble of my document, everything works fine (so the file is found by TeX). When I say \usemodule[t-foo] or \usemodule[foo], I get "system : no macros found in module foo" and, obviously, "undefined control sequence." So: is there any special form for a module? I'm very curious because I defined a set of similar macros in another module, and everything works fine. 2. Is it possible to use a certain encoding file, enco-bar.tex, for parts of a file only? Could one define a macro (in a module???) that would do something like \switchtoencoding[bar] and switch back to the file's default encoding afterwards? Thanks to all, best Thomas