{ Xref deck - mmt$io_identifier.

  TYPE
    mmt$io_identifier = RECORD
      specified: boolean,
      CASE io_function: iot$io_function OF
      = ioc$swap_in, ioc$swap_out =
        ijl_ordinal: jmt$ijl_ordinal,
      = ioc$read_page, ioc$write_page =
        taskid: ost$global_task_id,
        iocb_index: mmt$iocb_index,
      = ioc$read_for_server, ioc$write_for_server,
        ioc$read_from_client, ioc$write_to_client,
        ioc$allocate =
        queue_entry_location: dft$queue_entry_location,
      = ioc$read_ahead_on_server =
        read_ahead_iocb_index: mmt$iocb_index,
      CASEND,
    RECEND;

?? PUSH (LISTEXT := ON) ??
*copyc dft$queue_entry_location
*copyc iot$io_function
*copyc jmt$ijl_ordinal
*copyc mmt$iocb_index
*copyc ost$global_task_id
?? POP ??
