Comment 1 for bug 1384950

I'm not too sure about suspending the prompt helper along with the application, since it's a long running service in some cases. This is where the logic for bailing out of prompts should be (not in the prompt providers UIs)
The prompt providers UIs are fine to suspend since they're only associated with one instance of a prompt session (process/control group would help here).

We have a prompt session state (stopped/started), which could be modified to accept a suspend state. We could pick this up in the prompt helper client and do the necessary (start time-out/whatever)