Does the freehub/freewheel turn freely?

When you turn your tool counterclockwise, does the freehub turn (freehub/cassette)? A chainwhip is required to keep it from turning.
Or when you turn the tool counterclockwise, does it not turn (freewheel). No chainwhip is needed. Whole sprocket assembly screws off.

Pictures always help to make sure we're all on the right page.

From bad experiences with old style freewheels, I've gotten into the habit of always locking down my tool with the axle or quick release. Why isn't that possible?