Meaning of CATID in English
component category ID s
IDs mapped in MS OS Registry under the branch 'Component Categories'.
Components that implements all of the interfaces in a component category can register themselves as members of that category.
This is convenient for clients, that can choose components that belongs only to a specific, interesting for them, component category.
Acronyms Misc English vocab. Словарь сокращений и аббревиатур английского языка. 2012