HEADS UP: "Out of sync" problem explained

Hey, folks,
nicely explains in a Wiki
why it happens that
great Calc demo
is actually broken if you use more than one tab of it in your browser (try it yourself). Joonas wrote great tutorial explaining how to do not step on the same classic popular rake over and over again and there is a promise that golden Vaadin 7 will fix that for you too. :slight_smile:

I also suggest to Vaadin guys
do not
fix Calc demo and use it also as a known error demo, yet referring to the solution.

Thanks a lot, Joonas!