SECTION./FCAT
SEARCH/FCAT [cat_name] search_string [options]
	search in fit file catalog for frame with matching descriptor IDENT
SECTION./ICAT
SEARCH/ICAT [cat_name] search_string [options]
	search in image catalog for frame with matching Ident field
SECTION./TCAT
SEARCH/TCAT [cat_name] search_string [options]
	search in table catalog for table with matching Ident field
