(Alpha and only.) The Create User-Defined Storage Zone routine
    creates a new user-defined storage zone in the 64-bit virtual
    address space.

    Format

      LIB$CREATE_USER_VM_ZONE_64  zone-id [,user-argument]

                                  [,user-allocation-procedure]

                                  [,user-deallocation-procedure]

                                  [,user-reset-procedure]

                                  [,user-delete-procedure]

                                  [,zone-name]