Library /sys$common/syshlp/tcpip$telnet_help.hlb TN3270  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    At the DCL prompt, the TN3270 command starts a TELNET session
    that runs TN3270. For information about the TN3270 command,
    enter:

    $ HELP TN3270