{\TiCL: The prototype} {Didier Verna} {Last year, I presented some ideas about using one of the oldest programming language (Lisp), in order to modernize one of the oldest typesetting systems (\TeX). This talk was mostly focused on justifying the technical fitness of Lisp for this task. This time, I would like to take the opposite view and demonstrate a prototype, from the user's perspective. This will involve showing what a \TiCL\ document could look like, the implications in terms of typesetting vs.\ programmatic features, and also in terms of extensibility (relating this to package authoring). }