.\" Copyright (c) 1986 The Regents of the University of California.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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.\" @(#)tn3270.1 4.1 (Berkeley) 12/4/88
.TH TN3270 1 "December 4, 1988"
tn3270 \- full-screen remote login to IBM VM/CMS
permits a full-screen, full-duplex connection
to an IBM machine running VM/CMS
giving the appearance of being logged in
directly to the remote machine
Of course you must have an account on the machine
to which you wish to connect in order to log in.
looks to the user in many respects
like the Yale ASCII Terminal Communication System II.
is actually a modification of the Arpanet TELNET user interface (see
that interprets and generates raw 3270 control streams.
Emulation of the 3270 terminal is done in the Unix process.
This emulation involves mapping
3270-style commands from the host
into appropriate sequences to control the user's terminal screen.
The emulation also involves simulating the special 3270 keyboard keys
(program function keys, etc.)
by mapping sequences of keystrokes
from the ASCII keyboard into appropriate 3270 control strings.
This mapping is terminal dependent and is specified
or in an environment variable
Any special function keys on the ASCII keyboard are used whenever possible.
If an entry for the user's terminal
looks for an entry for the terminal type
uses a default keyboard mapping
The first character of each special keyboard mapping sequence
is either an ASCII escape (ESC),
a control character, or an ASCII delete (DEL).
If the user types an unrecognized function key sequence,
sends an ASCII bell (BEL), or a visual bell if
defined in the user's termcap entry, to the user's terminal
and nothing is sent to the IBM host.
is invoked without specifying a remote host system name,
it enters local command mode,
indicated by the prompt ``tn3270>''.
open connect to a remote host
close close the current connection
status print connection status
commands are not available in
command mode may also be entered, after connecting to a host, by typing
a special escape character
While in command mode, any host login session is still alive
but temporarily suspended.
The host login session may be resumed by entering an empty line
in response to the command prompt.
A session may be terminated by logging off the foreign host,
or by typing ``quit'' or ``close'' while in local command mode.
mset(1), telnet(1), termcap(3x), termcap(5), map3270(5),
\fIYale ASCII Terminal Communication
System II Program Description/Operator's Manual\fR
Performance is slow and uses system resources prodigiously.
Not all 3270 functions are supported,
nor all Yale enhancements.