The preceding content is referenced from the following websites:
http://unity3d.com/support/documentation/Manual/Shaders.html
http://unity3d.com/support/documentation/Components/SL-SurfaceShaders.html
http://unity3d.com/support/documentation/Components/SL-PropertiesInPrograms.html
http://unity3d.cba.pl/Documentation/Documentation/Components/SL-Properties.html
http://unity3d.com/support/documentation/Components/SL-ShaderPerformance.html
http://en.wikipedia.org/wiki/Cg_%28programming_language%29
http://http.developer.nvidia.com/CgTutorial/cg_tutorial_frontmatter.html
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