CATBOOK ("Captain's Logbook") is a "collection database" for documenting your DX history (= your QSLs, loggings, audio clips, etc).
Every row (station) in CATBOOK is connected to a user-specified color code called P-TAG (see P-TAGS for details). This tag is added to all stations that are saved in CATBOOK, and they are used to define how the station will appear not only in CATBOOK but also on the standard MAPS and TURTLE displays.
CATBOOK is created automatically when you make the first logging / offset logging. Then a new station is added automatically to CATBOOK when it is logged; also other JAGUAR functions can be used to add stations to CATBOOK. CATBOOK data can be edited (and new data added to already saved stations) by using the CATBOX tool window.
The CATBOOK file itself is a simple text file ("CATBOOK.txt"), and it is located in the JAGUAR installation folder.
CATBOOK stays mostly "out of sight"; it just serves as a background data source for several JAGUAR displays.
More information about maintaining the CATBOOK data can be found in the CATBOX help. In fact, you can edit CATBOOK.txt also directly (for example, with Notepad.exe), but it is not recommended because all the column positions must be exact and all the line breaks must be exactly at the end of the data row. If not, CATBOOK will get corrupted; it can happen easily if you edit it manually and are not careful enough.
At the moment, there are no tools for converting your old documentation (QSL statistics, etc.) to the CATBOOK format, but there are tools for quick setting of the color code for a bunch of stations (see STATION MENU > TAGGER for more information) and this way you can easily copy a large amount of stations from TURTLE to CATBOOK.