Reversing normals in Material node editor?

Hi

I am trying to figure out if I can reverse the normals of a geometry via material node editor for render time, like flipping the polygon normals in edit but only for render not for viewport.

thanks

Are you using proper view port shading mode; [Alt] + [Z]?

Hi

Actually what I am trying to do has nothing to do with realtime mode, I m trying to reverse the normals via material editor for the rendered image. I want to do it with nodes