VMS Help TELNET, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 host

    Required with the /CREATE_SESSION qualifier; optional in all
    other cases. Default: None.

    Remote host to which you want to connect. Specify one of the
    following:

    o  Host name

    o  IP address

 port

    Required with the /CREATE_SESSION qualifier; ignored in all other
    cases. Default: None.

    Specifies the remote port to which you want to connect the
    pseudodevice.

 unit

    Required with the /DELETE_SESSION qualifier; optional with the
    /CREATE_SESSION qualifier; ignored in all other cases. Default:
    0.

    With the /CREATE_SESSION qualifier, specifies the unit number
    you want associated with the network terminal. The default of
    0 allows the TELNET software to select the next available unit
    number.

    With the /DELETE_SESSION qualifier, specifies the unit number of
    the network terminal you want to delete.