+This key must be in PuTTY's native format (\c{*.\i{PPK}}). If you have a
+private key in another format that you want to use with PuTTY, see
+\k{puttygen-conversions}.
+
+\H{config-ssh-tty} The TTY panel
+
+The TTY panel lets you configure the remote pseudo-terminal.
+
+\S{config-ssh-pty} \I{pseudo-terminal allocation}\q{Don't allocate
+a pseudo-terminal}
+
+\cfg{winhelp-topic}{ssh.nopty}
+
+When connecting to a \i{Unix} system, most \I{interactive
+connections}interactive shell sessions are run in a \e{pseudo-terminal},
+which allows the Unix system to pretend it's talking to a real physical
+terminal device but allows the SSH server to catch all the data coming
+from that fake device and send it back to the client.
+
+Occasionally you might find you have a need to run a session \e{not}
+in a pseudo-terminal. In PuTTY, this is generally only useful for
+very specialist purposes; although in Plink (see \k{plink}) it is
+the usual way of working.
+
+\S{config-ttymodes} Sending \i{terminal modes}
+
+\cfg{winhelp-topic}{ssh.ttymodes}
+
+The SSH protocol allows the client to send \q{terminal modes} for
+the remote pseudo-terminal. These usually control the server's
+expectation of the local terminal's behaviour.
+
+If your server does not have sensible defaults for these modes, you
+may find that changing them here helps. If you don't understand any of
+this, it's safe to leave these settings alone.
+
+(None of these settings will have any effect if no pseudo-terminal
+is requested or allocated.)
+
+You can add or modify a mode by selecting it from the drop-down list,
+choosing whether it's set automatically or to a specific value with
+the radio buttons and edit box, and hitting \q{Add}. A mode (or
+several) can be removed from the list by selecting them and hitting
+\q{Remove}. The effect of the mode list is as follows:
+
+\b If a mode is not on the list, it will not be specified to the
+server under any circumstances.
+
+\b If a mode is on the list:
+
+\lcont{
+
+\b If the \q{Auto} option is selected, the PuTTY tools will decide
+whether to specify that mode to the server, and if so, will send
+a sensible value.
+
+\lcont{
+
+PuTTY proper will send modes that it has an opinion on (currently only
+the code for the Backspace key, \cw{ERASE}). Plink on Unix
+will propagate appropriate modes from the local terminal, if any.
+
+}
+
+\b If a value is specified, it will be sent to the server under all
+circumstances. The precise syntax of the value box depends on the
+mode.
+
+}
+
+By default, all of the available modes are listed as \q{Auto},
+which should do the right thing in most circumstances.
+
+The precise effect of each setting, if any, is up to the server. Their
+names come from \i{POSIX} and other Unix systems, and they are most
+likely to have a useful effect on such systems. (These are the same
+settings that can usually be changed using the \i\c{stty} command once
+logged in to such servers.)
+
+Some notable modes are described below; for fuller explanations, see
+your server documentation.
+
+\b \I{ERASE special character}\cw{ERASE} is the character that when typed
+by the user will delete one space to the left. When set to \q{Auto}
+(the default setting), this follows the setting of the local Backspace
+key in PuTTY (see \k{config-backspace}).
+
+\lcont{
+This and other \i{special character}s are specified using \c{^C} notation
+for Ctrl-C, and so on. Use \c{^<27>} or \c{^<0x1B>} to specify a
+character numerically, and \c{^~} to get a literal \c{^}. Other
+non-control characters are denoted by themselves. Leaving the box
+entirely blank indicates that \e{no} character should be assigned to
+the specified function, although this may not be supported by all
+servers.
+}
+
+\b \I{QUIT special character}\cw{QUIT} is a special character that
+usually forcefully ends the current process on the server
+(\cw{SIGQUIT}). On many servers its default setting is Ctrl-backslash
+(\c{^\\}), which is easy to accidentally invoke on many keyboards. If
+this is getting in your way, you may want to change it to another
+character or turn it off entirely.
+
+\b Boolean modes such as \cw{ECHO} and \cw{ICANON} can be specified in
+PuTTY in a variety of ways, such as \cw{true}/\cw{false},
+\cw{yes}/\cw{no}, and \cw{0}/\cw{1}.
+
+\b Terminal speeds are configured elsewhere; see \k{config-termspeed}.