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diff --git a/doc/config.but b/doc/config.but
index 4d848ef8..c237aa74 100644
--- a/doc/config.but
+++ b/doc/config.but
@@ -1,4 +1,4 @@
-\versionid $Id: config.but,v 1.18 2001/12/06 20:05:39 simon Exp $
+\versionid $Id: config.but,v 1.22 2001/12/15 12:15:24 simon Exp $
 
 \C{config} Configuring PuTTY
 
@@ -136,6 +136,14 @@ can record everything that went to the terminal, so that someone
 else can replay the session later in slow motion and watch to see
 what went wrong.
 
+\b \q{Log SSH packet data}. In this mode (which is only used by SSH
+connections), the SSH message packets sent over the encrypted
+connection are written to the log file. You might need this to debug
+a network-level problem, or more likely to send to the PuTTY authors
+as part of a bug report. \e{BE WARNED} that if you log in using a
+password, the password will appear in the log file, so be sure to
+edit it out before sending the log file to anyone else!
+
 \S{config-logfilename} \q{Log file name}
 
 \cfg{winhelp-topic}{logging.filename}
@@ -1452,7 +1460,7 @@ your server supports this, you should talk to your system
 administrator about precisely what form these challenges and
 responses take.
 
-\S{config-ssh-tis} \q{Attempt keyboard-interactive authentication}
+\S{config-ssh-ki} \q{Attempt keyboard-interactive authentication}
 
 \cfg{winhelp-topic}{ssh.auth.ki}
 
@@ -1479,6 +1487,28 @@ See \k{pageant} for general information on Pageant, and
 there is a security risk involved with enabling this option; see
 \k{pageant-security} for details.
 
+\S{config-ssh-changeuser} \q{Allow attempted changes of username in SSH2}
+
+\cfg{winhelp-topic}{ssh.auth.changeuser}
+
+In the SSH 1 protocol, it is impossible to change username after
+failing to authenticate. So if you mis-type your username at the
+PuTTY \q{login as:} prompt, you will not be able to change it except
+by restarting PuTTY.
+
+The SSH 2 protocol \e{does} allow changes of username, in principle,
+but does not make it mandatory for SSH 2 servers to accept them. In
+particular, OpenSSH does not accept a change of username; once you
+have sent one username, it will reject attempts to try to
+authenticate as another user. (Depending on the version of OpenSSH,
+it may quietly return failure for all login attempts, or it may send
+an error message.)
+
+For this reason, PuTTY will by default not prompt you for your
+username more than once, in case the server complains. If you know
+your server can cope with it, you can enable the \q{Allow attempted
+changes of username} option to modify PuTTY's behaviour.
+
 \S{config-ssh-privkey} \q{Private key file for authentication}
 
 \cfg{winhelp-topic}{ssh.auth.privkey}
@@ -1546,6 +1576,27 @@ in the list box.
 To remove a port forwarding, simply select its details in the list
 box, and click the \q{Remove} button.
 
+\S{config-ssh-portfwd-localhost} Controlling the visibility of
+forwarded ports
+
+\cfg{winhelp-topic}{ssh.tunnels.portfwd.localhost}
+
+The source port for a forwarded connection usually does not accept
+connections from any machine except the SSH client or server machine
+itself (for local and remote forwardings respectively). There are
+controls in the Tunnels panel to change this:
+
+\b The \q{Local ports accept connections from other hosts} option
+allows you to set up local-to-remote port forwardings in such a way
+that machines other than your client PC can connect to the forwarded
+port.
+
+\b The \q{Remote ports do the same} option does the same thing for
+remote-to-local port forwardings (so that machines other than the
+SSH server machine can connect to the forwarded port.) Note that
+this feature is only available in the SSH 2 protocol, and not all
+SSH 2 servers support it (OpenSSH 3.0 does not, for example).
+
 \H{config-file} Storing configuration in a file
 
 PuTTY does not currently support storing its configuration in a file