I had a false belief
I thought I came here to stay
We're all just visiting
All just breaking like waves
The oceans made me, but who came up with me?
Push me, pull me, push me, or pull me out .

So true Perl Jam (Push me Pull me lyrics), so true. I too have wondered how web clients should be notified of model changes. Should servers push events to clients or should clients pull events from servers? A topic worthy of its own song if ever there was one.