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OpenGL
ftp://rtfm.mit.edu/pub/usenet/news.answers/graphics/opengl-faq/
Frequently Asked Questions.
OpenGL Getting Started FAQ
http://www.opengl.org/resources/faq/getting_started.html
FAQ for beginning OpenGL with OpenGL.org
OpenGL Technical FAQ
http://www.opengl.org/resources/faq/technical
OpenGL developer FAQ and troubleshooting guide
OpenGL Toolkit FAQ
http://www.mathies.com/glfaq/GLToolkitFAQ.html
Information about various OpenGL toolkits including GLUT, SDL, CPW and others.
SGI
http://www.sgi.com/software/opengl/faq.html
OpenGL FAQ