Hi Nick,

>>>Is that the "Cplane" function in rhino?

Cplane would be seen as Construction Plane, Moi does handle this well with the view and/or object. It really depends on the need at the time and construction needed (IMHO).

Autocad 12, yes I remember, I remember before that when autocad was delivered on one 3.5 disk (I have that somewhere). Version 12 was in between Dos/win 3.1 and win 95 if I remember correctly.