Hi,
where can I download the guide with all the functions of openGL and with the relevant explanation?
If you mean the OpenGL programming guide can you get an older version as a pdf from gamedev. Look in the articles or resources.
If you are using linux should you already have the man pages installed.
If you want something similar for windows is a pretty old but good documentation available from Microsoft. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/opengl/openglstart_9uw5.asp
You could download that a seperate chm file before but now is it as far as I know only available as a part of the platform sdk. Something like a 100-200M download.