In this article I will talk about OpenGL extensions. Every extension is defined by an extension specification. I will explain how to read the extension specification so that you will know how to use the extensions. I will also show how you can check for the existence of extensions and how to initialize extensions in your own source code. I will show how you can use GLEW to query and use extensions with very little extra effort.
I assume the reader is familiar with the C++ programming language. If you want to know how to start programming in OpenGL, refer to my previous article titled Introduction to OpenGL.