At a recent gig in France, someone asked me for a 'mi bemol' to pitch some singers. Had to consider for a moment, then realised they wanted Eb. (French system uses fixed do). A hand signal would have done, but it seems they don't use that either! It seems the musos here are quite versed in that speak, and prefer it to what most of the Western world uses - real note names. I wonder if one system has any advantages over another, or is it just what one has got used to? On a personal note, movable do has more going for it. But that's not the issue.
In response to the first answer, and subsequent comments - Which actually is more widely used - fixed do, or note names? It's obvious from the question that I assumed, perhaps erroneously, the latter.