Set mesh to render two sided?

As I understand, backface-culling or two-sided rendering is a per-face value in Blender, not a per-object. Okay, how to set that with Python?

I’m currently using the Blender 2.4 API so I understand most people won’t know how to, but for those who remember, please tell. I browsed through all the NMesh and NFace functions and variables and can’t find anything.

Though I’m going to port my script to the 2.6 API, so if you know how there, please also let me know.