Displays the current storage area file or storage area snapshot
    file header Unique Identifier value for the storage area with the
    specified name or number.

    To execute the DISPLAY AREA_HEADER command, the user must be
    attached to the database which the root and areas belong to,
    either by specifying the database name when issuing the RMU/ALTER
    command or by executing the "ATTACH" command from the "RdbALTER>"
    prompt.