How the nightly import from the European Central Bank works: switching it on for the company, a group or a store, which rates it imports and where, when it runs, and how it keeps the rates tidy when currencies or settings change.
How currencies are switched on for the whole company, a group of stores or one store, how a store inherits them, what the default currency is, and what switching a currency off does at each level.
How exchange rates are set for the whole company, a group of stores or one store, how a store inherits them, why a store's own rate wins, and what deleting a rate does at each level.