Problem with wait with messages

[David]

I am not clear what you need to do: but it sounds like you want to use
the wait with messages form:

  http://handlers.rev-co.de/wiki/wait

On the other hand I have never had the need to use it - and I cannot
get "wait for messages" to work properly. Does anyone have an example
of how you can use "wait for messages" or "with messages" - I've never
got it to work?