Description

   LBR$GET_INDEX searches through the specified index for keys that
   match the match_desc argument. Each time it finds a match, it
   calls the user routine specified by the routine_name argument. If
   you do not specify the match_desc argument, LBR$GET_INDEX calls
   the user routine for every key in the index.

   For example, if you call LBR$GET_INDEX on an object library with
   match_desc equal to TR* and index_number set to 1 (module name
   table), then LBR$GET_INDEX calls routine_name for each module
   whose name begins with TR.