I believe that is Amapi ;)
But it's polygon modeler in this function

Amapi was also a nurbs modeler and has not the same appelling function when nurbs was drawing ;)

Alas the last version V8 was aborted : only some happy few have beta version!
It should have been a futur hit Poly+nurbs!

In Moi you have a similar appeling function when you edit the curve generator after a first creating surface or volume (with history enable)