2011

Control Vertices Creates a B-spline by specifying control vertices. Use this
method to create B-splines of degree 1 (linear), degree 2 (quadratic), degree 3
(cubic), and so on up to degree 10. Adjusting the shape of a spline by moving
control vertices often provides better results than by moving fit points.
This is the preferred method if you are creating geometry to use with 3D
NURBS surfaces.
988 | Chapter 19 S Commands