(Alpha and I64 only.) The Return Information About a Zone routine
    returns formatted information about a zone in the 64-bit virtual
    address space, detailing such information as the zone's name,
    characteristics, and areas, and then passes the information to
    the specified or default action routine.

    Format

      LIB$SHOW_VM_ZONE_64  zone-id [,detail-level]

                           [,user-action-procedure] [,user-arg]