Demonstration should run just out of the box, let me know in case of trouble. A session server, for each new user login this server start a new slave interpreter. Then at each HTML validation all parameters from HTML are transfer to slave interpreter before calling procedure attached to HTML page. This mechanism allow a clean separation between application logic and HTML presentation. A rule server, allows an automatic TK update for a client connected on it.
Application is decomposed in a hierarchical tree of elemental constrains.
Then at each validation client send query and server return update. Even libel text from widgets come from server allowing language fly translation.