I need some document of GL_NV_occlusion_query and VBO

The resouce of Extention of OpenGL were little. There was a book name “Open GL Extension Guide”,it only include GL_NV_occlusion_query,but no VBO , and no example code !
who can give me some example code about two function?

Thanks first!

Official extension documentation page:
(Who would buy such a book about extensions which is outdated on its first publishing date already?)

Download the NVIDIA SDK and search the samples for the functionality you need: