Pretty much - thanks. I found something very similar to this independently (naturally 30 seconds after posting the above question, as always, sigh) but I was missing the "automatic-connection-events" which was key for this to be usable in my case.

However I'm a bit surprised there isn't a more "procedural" way to get this, than this event driven stuff. To me, testing the current state of something is different from waiting for events for changes.

But hey, this seems to work - thanks!

/Z