wine users - Jul 2011 - Notification of quit event

I could not find any documentation on this subject, so any help would be
appreciated.

Is there any from within my Windows application to be notified of when my
application is about to closed when X11 is shutdown? More specifically when I
run my app via wine on OSX, the common way to shutdown the app is via command
key + Q. This quits X11 as well as my app. I would however like the opportunity
save the users current session. As of right now my app quits and all work done
is lost.

That's a good question.

I don't know how Linux notifies apps of impending system shutdowns.
It might be the SeatRemoved signal from ConsoleKit these days.
Anybody know?