VMS Help RTL Routines, SMG$, SMG$CREATE_KEY_TABLE, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 key-table-id

    OpenVMS usage:identifier
    type:         longword (unsigned)
    access:       write only
    mechanism:    by reference

    Receives the identifier of the newly created key table. The key-
    table-id argument is the address of an unsigned longword into
    which the key table identifier is written.