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The CAS Registry Number is similar to a telephone number and has no significance in terms of the chemical nature or hazards of the material. The CAS Registry Number can be used to locate additional information on the material, for example, when searching in books or chemical data bases.
What is Code Access Security in .NET. The best links I found for learning about CAS you can find on my Delicious page on the subject. In short, CAS is the security sandbox for .NET. Local apps typically have full trust which means they can do anything. .NET apps that are hosted in the browser can't do much.