Hi all, As a quick hack I made llinterp produce traces of all operations it executes -- no longer to stdout or py.log, but to an html file written to /tmp/usession-*. It's a hierarchical-looking page showing the nested calls. With Javascript browsers we can hide and show sub-calls by clicking around; all calls are initially hidden. It's certainly a more useful presentation than the terminal-based one. Of course I'm open to further suggestions :-) A bientot, Armin.