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COBOL, DATA_DIVISION, clauses, ALTERNATE_RECORD_KEY, alt-key
 *Conan The Librarian 

  is the Alternate Record Key for the file. It is the data-name of a
  data item in a record description entry for the file. It can be
  qualified, but it cannot be a group item that contains a
  variable-occurrence data item.  The data item must be described as:
  (1) alphanumeric or alphabetic category, (2) a group item,
  (3) unsigned numeric display, (4) a COMP-3 integer, or (5) a COMP
  integer.
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