CDO>  SET CONTEXT PERSONNEL
  CDO>  RESERVE COLLECTION OFFICERS
  CDO>  SHOW RESERVATIONS
     .
     .
     .
  CDO>  REPLACE COLLECTION OFFICERS
  CDO>  SHOW RESERVATIONS
     .
     .
     .

      In this example, the first SHOW RESERVATIONS command displays
      the reserved elements, their types, and the reserving context.
      The second SHOW RESERVATIONS command displays an informational
      notice indicating that no elements are reserved.