The Create User-Defined Storage Zone routine creates a new user-
    defined storage zone in the 32-bit virtual address space.

    Format

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

                               [,user-allocation-procedure]

                               [,user-deallocation-procedure]

                               [,user-reset-procedure]

                               [,user-delete-procedure] [,zone-name]