Who cares? It's not standard and shouldn't be used
You're being unnecessarily hardline.
He's probably using an API lib outside of the standard. How many external libs do you make use of? I have a few. DirectX, Ogre3D, PhysX, Newton, RakNet, etc. I also have MS windows & VC++ 2010 which is full of non-standard functions. Hell, even boost uses function names for its API that aren't standard.
I have a feeling those functions are from NCurses. No, I was wrong, they are TC++ functions. Still...
prestige, it seems you already know what they do. You'll need to clarify what you're asking.