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.TH VT 1C "21 Nov 1988"
.\" $Header: /f/osi/vt/RCS/vt.1c,v 6.0 89/03/18 23:46:22 mrose Rel $
.\"
.\"
.\" $Log:	vt.1c,v $
.\" Revision 6.0  89/03/18  23:46:22  mrose
.\" Release 5.0
.\" $.\" 
.SH NAME
vt \- VT interactive remote login initiator
.SH SYNOPSIS
.in +.5i
.ti -.5i
.B vt
\%[-g]
\%[-D]
\%[-f]
\%[-F logfile]
\%[-B]
\%[host]
.in -.5i
.SH DESCRIPTION
The \fIvt\fR program implements the initiator side of 
a remote login service based on the Virtual Terminal (VT)
standard and the VT TELNET profile from the NIST OSI Workshop
Implementor's Agreements.
.PP
The user interface to the service is based on BSD 4.2 TELNET.
Command mode is entered by typing an escape character (``^]'' by default)
as in TELNET.
.SH OPTIONS
.TP
.B -g
Use only the G0 character set for the \fIascii\fR repertoire (graphics only).
.TP
.B -D
Use the VT asynchronous default profile (see ISO 9040) rather than
the TELNET profile.
.TP
.B -B
Do not use the VT-BREAK functional unit (see ISO 9040) in negotiating
the VT association.
.TP
.B -F logfile
Sets the VT logfile.
Note that the pathname of this file is interpreted relatively to the
ISODE logging area.
To have tracing information written to a file in the current
directory,
start the filename with \*(lq./\*(rq.
.TP
.B -f
Do not read and execute the commands in the file \fI$HOME/.vtrc\fR on startup.
.SH COMMANDS
.TP
.B open\0host
Open an association with the remote login service on the named host.
.TP
.B close\fR
Close the existing association.
.TP
.B quit\fR
Close the association and exit the remote login initiator process.
.TP
.B escape
Set the ``escape character'' used to enter command mode. Control  characters
may  be  specified  as ``^'' followed by a single letter;
e.g. ``control-X'' is ``^X''.
.TP
.B ayt
Send an ``are you there'' message to the remote login server.
.TP
.B break
Send a ``break'' message to flush data queued in both directions
and interrupt the remote process.
.TP
.B help
Print a description of the available commands.
.TP
.B set
Configure the VT variables listed below.
.TP
.B status
Prints the current status of VT.
.TP
.B suspend
Suspend
.IR vt .
This command only works when the user is using the
.IR csh .
.PP
VT commands in $HOME/.vtrc are executed when \fIvt\fR starts
up unless the \fI-f\fR flag is used.
.SH Variables
.PP
Variables that can be manipulated with the \fIset\fR
command include:
.TP
.B crmod
Toggle carriage return mode.  When this mode is enabled
any carriage return characters received from the remote
host will be mapped into a carriage return and  a  line
feed.  This mode does not affect those characters
typed by the user, only those received.
.TP
.B echo
Sets the echo mode to remote (ie. responder echoes) with ``set
echo remote'' or local (ie. initiator echoes) with ``set
echo local''.
.TP
.B repertoire
Sets the character set to \fIascii \fRor \fItransparent\fR
(binary).
.SH FILES
.nf
.ta \w'/usr/etc/isoentities    'u
/usr/etc/isoentities	ISODE application entity title database
$HOME/\&.vtrc	runcom file
.fi
.SH "SEE ALSO"
vtd(8c),
.br
\fIThe ISO Development Environment: User's Manual\fR,
.br
ISO DIS 9040, 9041:
\fIInformation Processing Systems \-\-
Virtual Terminal Service and Protocol\fR
.br
Implementation Agreements for Open Systems Interconnection Protocols
.SH AUTHORS
Rick Wilder and Don Chirieleison,
The MITRE Corporation.
.br
Parts of this program are based on the \fItelnet\fR(1c) program supplied with
Berkeley UNIX.
.SH BUGS
.PP
\fIvt\fR and \fIvtd\fR need to be brought up to date with BSD 4.3(4?)
TELNET.
.PP
The encodings of the VT PDUs may need to be updated when 
the International Standard version of ISO 9041 is available.