Component caching across sites?

Denise Bowker

My understanding of components is that each component is cached (depending up on the cache timeout set) for the whole site.

For example if I have a component that has one boolean Datum, that if I select "true" on one page, that component will be pulled from cache regardless of which page it's on as long as "true" was selected. (If that's not true - correct me now and stop reading.)

What happens if that same component is used on two different sites? Are components cached across sites or not?