The list of CATS' catalogs provides references and prepared documentation. Here we show some details. To simplify the design of CATS operating programs, two utilities named 'select' and 'match' are provided. A user operates with CATS from any directory since the programs for general use of the catalogs are accessible system-wide. The described manner of catalog storage eases the database development, its expansion with new data and the fine-tuning of the supporting programs.
All astronomical catalogs have a different format and list different observables.
First and last procedures work with system of menu. The forms are used in WEB-access for input of the parameters of search. The tasks for search in big area or big list of sources demand long time and we recomend to use the e-mail tasks. WebGlimpse allows to expand the system of search not only inside the local file system of CATS, but amongst documentation in analogous servers in Internet. Using CATS Authors have not full information about external using of the database.