OpenGL core profile headers are located here:
http://www.opengl.org/registry/api/GL/glcorearb.h
This header contains only core profile and ARB extension interfaces, as described in appendix G.2 of the OpenGL 4.3 Specification. It does not include interfaces found only in the compatibility profile.
I think this is what you ask for when you say OpenGL 4
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Here are some OpenGL 4 tutorials: