[asmodeo]

Hi forum.
I'm asmodeo from rome and i write about the tutorial of basic head modelling.
I want to know where is the function that the instructor make when i see the model created with the pen tool that become from a normal polygon to a smooth polygon.
The polygon ( the primitive head ) during the tutorial is possible to see in a simple poligon created withe pen tool and after the mesh is possible to see in smooth mode.
Where is this command?
Where is the function that i have to make?
This question is for the first part of this tutorial and i don't know a metod for finish this tutorial.
Thank you...