Normally I follow server behaviors>webassist>Cookies>Set Session Value> and in this case I selected "before page load", name the session variable, then click the lightning icon and the file activity opens repeatedly and does not stop.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.