Quote Originally Posted by Shakti View Post
It seems that the GL headers comes with Windows SDK. I have my include files from Windows SDK in the following directory: C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Include

And i also have a gl folder in the Include folder there with GL.h and GLU.h
Those, in general, tend to have an OpenGL version outdated by decades, afaik.

GLEW (or other libraries) interact with the driver directly to get function pointers for the new functionality.
GLFW is just a little framework that eases the process of ..say.. creating windows and contexts in a portable way.