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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.
CAS is built on the following elements, among others: 1  Permissions: These are the basic rights needed to access a protected resource or execute a protected operation. 2  Permission Set: This is a set of permissions, such full trust, nothing, Internet, local intranet and others.