I have just finished writing an article related to semantics of programming languages that support code mobility. The title and the corresponding URLs are: o A Space-Time Logic and the @-Calculus http://www.ufba.br/~ulisses/astlc.html And comments, suggestions, criticisms or references from and of yours are naturally welcome. Thank you for the attention. Ulisses Ferreira Th-1: [Humour] There does not exist any logic before nine.