VMS Help RTL Routines, PPL$, PPL$DELETE_VM_ZONE, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 zone-id

    OpenVMS usage identifier
    type          longword (unsigned)
    access        read only
    mechanism     by reference
    Identifier of the zone. The optional zone-id argument is the
    address of an unsigned longword containing the zone identifier.

 zone-name

    OpenVMS usage char_string
    type          character string
    access        read only
    mechanism     by descriptor
    Name of the zone. The optional zone-name argument is the address
    of a descriptor pointing to a character string containing the
    zone name.