tn3270 man page on NeXTSTEP

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TN3270(1)							     TN3270(1)

NAME
       tn3270 - full-screen remote login to IBM VM/CMS

SYNOPSIS
       tn3270 sysname

DESCRIPTION
       Tn3270  permits	a  full-screen,	 full-duplex  connection  from	a UNIX
       machine to an IBM machine running VM/CMS giving the appearance of being
       logged  in  directly to the remote machine on an IBM 3270 terminal.  Of
       course you must have an account on the machine to  which	 you  wish  to
       connect	in order to log in.  Tn3270 looks to the user in many respects
       like the Yale  ASCII  Terminal  Communication  System  II.   Tn3270  is
       actually	 a  modification  of  the  Arpanet  TELNET user interface (see
       telnet(1)) 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.	Tn3270
       uses  curses(3x)	 and  the /etc/termcap file to do this.	 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   in	 a  description	 file,
       /etc/map3270, (see map3270(5)) or in an	environment  variable  MAP3270
       (see  mset(1)).	 Any  special  function keys on the ASCII keyboard are
       used whenever possible.	If an entry for the  user's  terminal  is  not
       found,  tn3270  looks  for  an entry for the terminal type unknown.  If
       this is	not  found,  tn3270  uses  a  default  keyboard	 mapping  (see
       map3270(5)).

       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, tn3270 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.

       If  tn3270  is invoked without specifying a remote host system name, it
       enters local command mode, indicated by	the  prompt  ``tn3270>''.   In
       this mode, tn3270 accepts and executes the following commands:

	    open      connect to a remote host
	    close     close the current connection
	    quit      exit tn3270
	    z	      suspend tn3270
	    status    print connection status
	    ?	      print help information

       Other  common  telnet  commands	are  not  available in tn3270.	Tn3270
       command mode may also be entered, after connecting to a host, by typing
       a special escape character (typically control-C).

       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  (press  the  RETURN  key) 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.

FILES
       /etc/termcap
       /etc/map3270

AUTHOR
       Greg Minshall

SEE ALSO
       mset(1),	 telnet(1),  termcap(3x),  termcap(5),	map3270(5), Yale ASCII
       Terminal Communication System II Program Description/Operator's	Manual
       (IBM SB30-1911)

BUGS
       Performance is slow and uses system resources prodigiously.

       Not all 3270 functions are supported, nor all Yale enhancements.

4.3 Berkeley Distribution      January 11, 1986			     TN3270(1)
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