Questions, mostly on terrain

Alright, I'm looking through the Terrain Block class, and I see a function called "findSquare". Does anyone know exactly what this does?

On an unrelated note: Where would one go to find the size of a particular terrain map, or its center (0,0?). Essentially, I need extent of the terrain map as far as it goes before it starts to repeat. How would I get this in a script?

Also, is the GetNormalAndHeight function visible from scripting?

Thanks!