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+.TH VT 1 
+.SH NAME
+vt \- emulate a VT-100 or VT-220 terminal
+.SH SYNOPSIS
+.B vt
+[
+.B -2sa
+]
+.SH DESCRIPTION
+.I Vt
+replaces a rio window with a fresh instance of the shell
+.IR rc (1)
+running within an emulation of a DEC VT-100 terminal.
+The
+.B -2
+and
+.B -a
+options configure
+.I vt
+to emulate a VT-220 and Ansi terminal respectively.
+The
+.B -s
+options forces a saner color scheme, i.e, black text on white
+background.
+.PP
+The right button has a menu with the following entries to provide
+the sort of character processing expected by non-Plan 9 systems:
+.TF cooked
+.TP
+.B 24x80
+Resize the
+.I vt
+window to hold 24 rows of 80 columns.
+.TP
+.B crnl
+Print a newline (linefeed) character after receiving a carriage return from the host.
+.TP
+.B cr
+Do not print a newline after carriage return.
+.TP
+.B nlcr
+Print a carriage return after receiving a newline from the host.
+.TP
+.B nl
+Do not print a carriage return after newline.
+.TP
+.B raw
+Enter raw (no echo, no interpretation) character mode for input.
+.TP
+.B cooked
+Leave raw mode.
+.TP
+.B exit
+Exits
+.IR vt .
+.PD
+.PP
+The middle button has a menu with the following entries:
+.TF right_key
+.TP
+.B backup
+Move the display back one screenful.
+.TP
+.B forward
+Move the display forward one screenful.
+(These are a poor substitute for a scroll bar.)
+.TP
+.B reset
+Display the last screenful; the same as going
+.B forward
+to the end.
+.TP
+.B clear
+Clear the screen.  Previous contents can be recovered using
+.BR backup .
+.TP
+.B send
+Send the contents of the
+.B rio
+snarf buffer, just as
+.B send
+in the
+.B rio
+menu.
+.TP
+.B scroll
+Make new lines visible as they appear at the bottom.
+.TP
+.B page
+When the page fills, pause and wait for a character to be typed before proceeding.
+The down arrow key advances a page without sending the character to the host.
+.PD
+.PP
+To exit
+.IR vt ,
+exit its
+.B rc
+session by, for example, typing EOT (control-D).
+.SH SOURCE
+.B /sys/src/cmd/vt
+.SH BUGS
+.PP
+This program is used only for communicating with foreign systems, so it is not
+as rich an emulation as its equivalent in other environments.
+.PP
+Use care in setting raw and newline modes when connecting to Unix systems
+via
+.IR con .
+It may also be necessary to set the emulator into raw mode.