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以下问题与回答摘自CAS网站 http://www.cas.org/faq.html

Q. What is CAS?
A. CAS (Chemical Abstracts Service) is a division of the American Chemical Society. We are located in Columbus, Ohio. CAS is the producer of the largest and most comprehensive databases of chemical information. Our principal databases are Chemical Abstracts (CA) which contains over 23 million document records from the chemical journal and patent literature, and Registry which contains over 24 million substance and 50 million sequence records

CAS also operates the STN International online service with partner organizations in Europe and Asia. STN provides access to nearly 200 databases covering topics such as science, technology, patents, and business information.

Q. What is a CAS Registry Number?

A. CAS Registry Numbers (often referred to as CAS RNs or CAS Numbers) are unique identifiers for chemical substances. A Registry Number itself has no inherent chemical significance but provides an unambiguous way to identify a chemical substance or molecular structure when there are many possible systematic, generic, proprietary, or trivial names.

CAS Registry Numbers are used in many other public and private databases as well as chemical inventory listings and of course are included in all CAS produced databases.

Q. Tell Me Briefly about CAS Products

A. CAS offers online, web-based, desktop, print, and CD-ROM access to databases covering science, engineering, technology, patents, business information, and much more. These products are designed to accommodate a wide range of information needs, whether you are an infrequent searcher who only needs a few quick answers, or a professional searcher who requires a more powerful and comprehensive set of search tools.

CAS and STN products are fee based and generally require one to set up an account.

Read on to see which CAS product might be right for you.

Q. Does CAS offer any free services?

A. There are free demo versions of CAS products including STN Easy, CA on CD, SciFinder, and SciFinder Scholar.

In the STN online system there are "Learning file" versions of CAS