> Currently Nstart uses session storage to be sure the key is wiped ASAP after the workflow finishes, so it's tab specific

That makes sense, probably not worth confusing the user by persisting stuff, although maybe you could pass it from page to page. Removing the link works pretty well too, although it's clearly useful since he clicked it. Maybe you could open it in a new window? Anyhow, I'll take another look at the popup workflow.