Recent versions of the SmokePing active measurement and visualization tool include a new tool called SmokeTrace. Like SmokePing, SmokeTrace runs on a Web server. Unlike SmokePing, SmokeTrace performs traceroute-style measurements on demand and in real time. The presentation is very similar to mtr, and is based on AJAX (Asynchronous Javascript and XML) for communication between the browser front-end and the back-end in the Web server.