I believe something like that was the underlying tech. I researched it at the time but I just can't remember 100% now, although I think that was it. It actually was implemented via a Java applet in the browser, so there was no way we could block or restrict a specific exe with group policy. The firewalls were already scheduled for replacement/upgrade, so for a few weeks we ended up just watching traffic and slapping wrists if more than one person ever tried to use the tool at the same time.