I don't remember for sure. I think that if the title exited (by returning, or hitting an unhandled exception), the console tore everything down and relaunched the title . . . but it also might have just let threads die until there weren't any left to run, and then just sat there (running just system and UI threads).

It wasn't something I expected, and there were good reasons for the behavior other than "let's hassle developers with more annoying cert requirements".