Ok I figured out how to update the headers
Basically, you gain the functionality of the newer version of openGL (ie. 1.1 and above) by using the extensions library (glext.h) from the official site.
Here is where to get it
But the thing is that the header gives you the function pointers which you have to interface with the correct function calls yourself. To make this easier you can use other libraries that load the library for you, like GLEW or GLee.
The way openGL works is a bit different. Essentially different video card vendors (eg nVidia and ATI) constantly make extensions for openGL, and eventually the extensions become "officialized". OpenGL is constantly being updated by the vendors, but it takes time for these updates to be official. Some of the functions are vendor specific, any functions starting with gl_ATI_ will only work on ATI cards (if that card supports it). Likewise any functions starting with gl_NV_ will only work on nVidia cards (if that card supports that function). You can get the vendor specific extensions that aren't official yet from your graphics vendor.
It's actually a fairly smart and efficient system. You learn something new everyday
