I client has just asked me to explain screen plane, layer plane and 3D plane.…
Vectorworks Screen plane Vs Layer Plane
Here is a youtube movie from one of my old friends, Steve Scaysbrook. He is looking at an overview of Screen plan Vs Layer plane, how to set it up, and perhaps more importantly easily change whole drawings easily with the Vector Depot plugin.
Steve also has a website focussed on CPD. Well worth a visit.