Latest Headers for OpenGL?

[SpiderPig500]

How do I find the latest headers and Library's for OpenGL?
The latest is 4.2...??
And how do I go about finding what version of I already have?

Many thanks, :)

[V-man]

The Wiki
http://www.opengl.org/wiki/Getting_started

and more specifically
http://www.opengl.org/wiki/Getting_started#Getting_Functions

so get GLEW.

[SpiderPig500]

Thanks, that helps :)