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diff --git a/doc/using.but b/doc/using.but
index fec03d32..5448b81a 100644
--- a/doc/using.but
+++ b/doc/using.but
@@ -1,5 +1,3 @@
-\define{versionidusing} \versionid $Id$
-
 \C{using} Using PuTTY
 
 This chapter provides a general introduction to some more advanced
@@ -91,7 +89,7 @@ and down by pressing \i{Shift-PgUp} and \i{Shift-PgDn}. You can
 scroll a line at a time using \i{Ctrl-PgUp} and \i{Ctrl-PgDn}. These
 are still available if you configure the scrollbar to be invisible.
 
-By default the last 200 lines scrolled off the top are
+By default the last 2000 lines scrolled off the top are
 preserved for you to look at. You can increase (or decrease) this
 value using the configuration box; see \k{config-scrollback}.
 
@@ -330,10 +328,10 @@ information.)
 \H{using-x-forwarding} Using \i{X11 forwarding} in SSH
 
 The SSH protocol has the ability to securely forward X Window System
-applications over your encrypted SSH connection, so that you can run
-an application on the SSH server machine and have it put its windows
-up on your local machine without sending any X network traffic in
-the clear.
+\i{graphical applications} over your encrypted SSH connection, so that
+you can run an application on the SSH server machine and have it put
+its windows up on your local machine without sending any X network
+traffic in the clear.
 
 In order to use this feature, you will need an X display server for
 your Windows machine, such as Cygwin/X, X-Win32, or Exceed. This will probably
@@ -370,12 +368,12 @@ For more options relating to X11 forwarding, see \k{config-ssh-x11}.
 
 \H{using-port-forwarding} Using \i{port forwarding} in SSH
 
-The SSH protocol has the ability to forward arbitrary \i{network
-connection}s over your encrypted SSH connection, to avoid the network
-traffic being sent in clear. For example, you could use this to
-connect from your home computer to a \i{POP-3} server on a remote
-machine without your POP-3 password being visible to network
-sniffers.
+The SSH protocol has the ability to forward arbitrary \I{network
+connection}network (TCP) connections over your encrypted SSH
+connection, to avoid the network traffic being sent in clear. For
+example, you could use this to connect from your home computer to a
+\i{POP-3} server on a remote machine without your POP-3 password being
+visible to network sniffers.
 
 In order to use port forwarding to \I{local port forwarding}connect
 from your local machine to a port on a remote server, you need to:
@@ -955,3 +953,20 @@ DSR/DTR.
 
 For example, \cq{-sercfg 19200,8,n,1,N} denotes a baud rate of
 19200, 8 data bits, no parity, 1 stop bit and no flow control.
+
+\S2{using-cmdline-sshlog} \i\c{-sessionlog}, \i\c{-sshlog},
+\i\c{-sshrawlog}: specify session logging
+
+These options cause the PuTTY network tools to write out a \i{log
+file}. Each of them expects a file name as an argument, e.g.
+\cq{-sshlog putty.log} causes an SSH packet log to be written to a
+file called \cq{putty.log}. The three different options select
+different logging modes, all available from the GUI too:
+
+\b \c{-sessionlog} selects \q{All session output} logging mode.
+
+\b \c{-sshlog} selects \q{SSH packets} logging mode.
+
+\b \c{-sshrawlog} selects \q{SSH packets and raw data} logging mode.
+
+For more information on logging configuration, see \k{config-logging}.