Thanks Gerry - seems like getting my app to 'suspend' was a one-off glitch
that I can't repeat - like you say, it always quits now. So, it seems that
the shutdown message is the only one that gets sent - for the moment I think
we'll just implement an automated save and tell our students that's what
I just save all the stuff I need to to .txt files every time the app quits, and
reload it on startup. For my situation that provides the neatest way to
implement the "suspension" and "resumption" of an app. In your case perhaps you
can save the data then ask if they want it restored when they op
