VMS Help DECnet-Plus, DCL Commands, SET, HOST, /X29, Qualifiers, /PROTOCOL_IDENTIFIER=string  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /NOPROTOCOL_IDENTIFIER

    (Default=/PROTOCOL_IDENTIFIER="01")

    Use this qualifier to put a non-standard X.29 protocol identifier
    string  into  the  'protocol  identifier' field of the call.  The
    string is interpreted as a series  of  hexadecimal  digits  which
    fill  the  first  4 bytes of user data in the call packet.  Valid
    values for this string are set up by the X.29 protocol.