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TCPIP Services, Programming Interfaces, Sockets API, $QIO, IO$_TTY_PORT|IO$M_TN_STARTUP, Condition Values Returned
 *Conan The Librarian 

    SS$_IVCHAN         Programming error. The specified channel is
                       not valid.
    SS$_IVMODE         Programming error. The access mode of the
                       channel is more privileged than the access
                       mode of the terminal's channel.
    SS$_NOPRIV         Programming error. The TN$M_LOGIN_ON_
                       DASSGN characteristic was specified in a
                       characteristics mask from a QIO in USER or
                       SUPERVISOR mode without either the BYPASS or
                       SYSPRV privilege.
    SS$_NOTNETDEV      Programming error. The specified channel is an
                       assignment to a non-BG device.
    SS$_PROTOCOL       Programming error. The specified protocol
                       number is not valid, or the internet network
                       is not available.
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