/sys$common/syshlp/helplib.hlb TELNET, Qualifiers, /NOINTERACTIVE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Optional. Default: TELNET command mode.

    Disables the capability of using the escape character to leave
    a session and return to the TELNET prompt. This option is useful
    when the TELNET command is referenced in a command procedure in a
    captive account.