/sys$common/syshlp/helplib.hlb LBR Routines, LBR$SET_LOCATE, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Librarian record access may be set to move mode (the default
    set by LBR$SET_MOVE) or locate mode. The setting affects the
    operation of the LBR$GET_RECORD routine.

    If move mode is set (the default), LBR$GET_RECORD copies the
    requested record to the specified user buffer. If locate mode is
    set, the record is not copied. Instead, the outbufdes descriptor
    is set to reference the internal LBR subroutine buffer that
    contains the record.