Is Z Depth layer based or universal?

Quick question really. Is the depth used by meshes universal, or layer based?

For example, two objects at a depth of 10, one object is on a layer behind the other object also in its own layer. Are those objects sharing the same space as each other, or is the object on the layer above seen as higher up and therefore not clipping the object in the layer below, regardless of the depth of that one.

Please say layer based, please say layer based.

It should be layer based unless you enable Z layering in layer properties, I think.

It should be layer based unless you enable Z layering in layer properties, I think.

Woohoo! Excellent, thank you!