The way i see it. Everything normally is set to the same entityorder, thus consulting the z-buffer.
I mean, if you set everything to entityorder 4, then it will consult the z-buffer. Set everything some things to entityorder 3 and some to entity order 0, the 0 entities will be rendered infront of the 3, but in the order of the 0 entities place in the z-buffer.
I'm not sure if entities all are preset to a certain entityorder, i'd imagine they would be. So going on that theory, i'd say that entityorder < 0 would be rendered first, entityorder > 0 would be rendered last.
I mean, if you set everything to entityorder 4, then it will consult the z-buffer. Set everything some things to entityorder 3 and some to entity order 0, the 0 entities will be rendered infront of the 3, but in the order of the 0 entities place in the z-buffer.
I'm not sure if entities all are preset to a certain entityorder, i'd imagine they would be. So going on that theory, i'd say that entityorder < 0 would be rendered first, entityorder > 0 would be rendered last.