Description

   Before calling LBR$GET_RECORD, you must first call LBR$LOOKUP_
   KEY or LBR$FIND to set the internal library read context to the
   record's file address (RFA) of the module header of the module
   whose records you want to read.

   LBR$GET_RECORD uses two record access modes: locate mode and
   move mode. Move mode is the default. The LBR$SET_LOCATE and
   LBR$SET_MOVE subroutines set these modes. The record access
   modes are mutually exclusive; that is, when one is set, the other
   is turned off. If move mode is set, LBR$GET_RECORD copies the
   record to the user-specified buffer described by inbufdes. If you
   have optionally specified the output buffer string descriptor,
   outbufdes, the Librarian fills it with the actual length and
   address of the data. If locate mode is set, LBR$GET_RECORD
   returns the record by way of an internal subroutine buffer,
   pointing the outbufdes descriptor to the internal buffer. The
   second parameter, inbufdes, is not used when locate mode is set.