Whats the best way of linking/synchronising view models in Knockout?

Question

If you have several view models on one page, how do you ensure that you can keep them synced? For example, if one item is added or a button clicked on one view model and you

Answer 1

You seem to be driving toward contradictory goals. The way you would do that in Knockout is to create observables, but yet you don't seem to want that.

If you have Foo and Bar objects with observables, you may not want observables on Foo that interact with bar or vice-verse, but why not have a Widget that watches Foo and Bar and mediates?