Hello, I recently had to add a tool which generates a variable number of output files, and I used the HTML / output directory trick as (very concisely) explained here: http://g2.trac.bx.psu.edu/wiki/AddingToolsFAQ This is a very cool feature! It took some time to get right, so I'm attaching a complete working example for future reference (you can add it to the wiki, if you'd like). Using an <IFRAME> inside the output HTML, I can even show the multiple output files in the main HTML page, in a report-like way. Thanks, and keep up the good work. Gordon.