diff --git a/handbook/computer.html b/handbook/computer.html
index e786731b1..38277b4f2 100644
--- a/handbook/computer.html
+++ b/handbook/computer.html
@@ -70,7 +70,8 @@ directly but we haven't got this configured properly yet.) Use a usb stick to tr
 if you can't get your own laptop or phone to work with the printer.
 
 <h3>The Expo Laptop's Friend: Aziraphale</h3>
-<p>In 2019 we have another general-use laptop. This is not connected by any cabling and just uses WiFi. Like the <i>expo laptop</i> it is running debian Linux and has the same set of software installed (survex/aven, tunnelx, therion, tortoisehg, git etc.) and you login to it using the username "expo" and the usual cavey:beery password. It is a 14-inch Thinkpad on loan from Michael Sargent and it is called "aziraphale". The <i>expo laptop</i> is just called "debian". 
+<p>In 2019 we had another general-use laptop. This is not connected by any cabling and just uses WiFi. Like the <i>expo laptop</i> it is running debian Linux and has the same set of software installed 
+    (survex/aven, tunnelx, therion, git etc.) and you login to it using the username "expo" and the usual cavey:beery password. It is a 14-inch Thinkpad on loan from Michael Sargent and it is called "aziraphale". The <i>expo laptop</i> is just called "debian". 
 
 <h3>Networking Hardware - experts only</h3>
 
@@ -83,7 +84,7 @@ above the sink/stove area and connected via a usb cable to the Acer netbook. The
 <p>The potato hut WiFi is running DHCP and allocating IP addresses of the form 192.168.1.x where x is a number between 11 and 99 .
 <p>The <em>Expo laptop</em> has a dynamic local address of this form. 
 It has a 64GB microSD card  plugged into it which holds the local copy of /expofiles/ .
-<p>The Acer Aspire netbook ("tclaspire3")  is ona static address <a href="http://192.168.1.100/">192.168.1.100</a>. 
+<p>The Acer Aspire netbook ("tclaspire3")  is on a static address <a href="http://192.168.1.100/">192.168.1.100</a>. 
 <p>The Gasthof WiFi - which you can still use - is "StaudnGast" and has no WiFi password but there is a login webpage (Gast/Gastin21). It allocates IP addresses in the range
 192.168.2.x etc. The antenna is now on the first-floor balcony within 
 sight of the tatty hut window.
diff --git a/handbook/troggle/serverconfig.html b/handbook/troggle/serverconfig.html
index 8eae6df79..8a8650bdf 100644
--- a/handbook/troggle/serverconfig.html
+++ b/handbook/troggle/serverconfig.html
@@ -6,29 +6,101 @@
 <link rel="stylesheet" type="text/css" href="../../css/main2.css" />
 </head>
 <body><style>body { background: #fff url(/images/style/bg-system.png) repeat-x 0 0 }</style>
-<h2 id="tophead">CUCC Expedition Handbook</h2>
+<h2 id="tophead">CUCC Expedition Handbook: Server</h2>
 <h1>The Expo server</h1>
 <p>Troggle is the software which runs the the expo cave survey data management and website. It is not the only thing running on the expo server.
 
-<h3 id="what">Server configuration</a></h3>
+<h3 id="what">Server configuration: directory structure</a></h3>
+<p>This is the folder structure of the repo <var>:expoweb:</var> which is also the root
+of the website. Note that the webserver (apache) presents many more apparent folders, such as <var>expofiles</var>, than there are folders because that's what it and troggle do.
+<p>In the list below only the <var>handbook</var> folder has been expanded. The <var>years</var> folder includes 
+42 subfolders from <var>1976</var> to <var>2019</var>.
+<code><textarea id="folders" rows="30" cols="30">
+.
+├── 1623
+├── 1626
+├── cave_data
+├── css
+├── documents
+├── entrance_data
+├── folk
+├── gallery
+├── handbook
+│   ├── computing
+│   ├── festering
+│   ├── i
+│   ├── l
+│   ├── putty
+│   ├── rig
+│   ├── survey
+│   ├── t
+│   └── troggle
+├── images
+├── map
+├── maps
+├── noinfo
+├── others
+├── pending
+├── photos
+├── piclinks
+├── scripts
+├── signup
+├── templates
+├── tinypix
+├── topos
+└── years</textarea></code>
 
-<br />apache webserver
-<br />MySQL database
-<br />cgit
-<br />boe
-<br />cron
-<br />Makefile
-<br />bins
-<br />expofiles
-<br />ssh
+<p>The handbook illustrates the i/t/l idiom whereby an image file (i) is displayed with a paragraph of text as an HTML file (l) and there is a thumbnail image (t) which is included in another document, e.g. see <a href="../../1623/walkin.htm">the photographic guide to the walk from the toll road car park</a>.
+
+<h3 id="what">Server configuration: software</a></h3>
+
+<ul>
+<li>apache webserver
+<li>MySQL database
+<li>cgit (live webpage showing git status of repos)
+<li>Makefile
+<li>bins
+<li>expofiles
+<li>ssh
+<li>cron
+<li>xapian (search function)
+<li>boe
+</ul>
  
-<p>[2020-04-10] <em>To be written...</em>
+<p>[2020-05-03] <em>To be written...</em>
+
+<h3>cron</h3>
+<p>The server runs it's hourly, daily and weekly scripts using the anacron system. In 
+<var>~expo/config/cron/</var> on the server, there are <var>expo.hourly</var>
+and <var>expo.daily</var> scripts and these are launched at the appropriate times by 
+the server root from <var>/etc/crontab</var>.
+
+<h3>Search: xapian</h3>
+<p>Installed independently of troggle simply with <var>apt install xapian-omega</var> and 
+then configured into the troggle-generated menus in <var>css/main2.css</var>. The function is 
+connected with an apache configuration 
+<code>ScriptAlias /search /usr/lib/cgi-bin/omega/omega</code> in <var>~expo/config/apache/expo.conf</var>.
+Installed by Wookey in May 2020.
+
+<h3>boe</h3>
+<p>This is a perl script, and server by the webserver using the configuraiotn
+<code><pre>
+#bank of expo
+#current expedition
+ScriptAlias /boe /home/expo/boe/boc/boc.pl
+<Directory /home/expo/boe/boc>
+        AddHandler cgi-script .pl
+        SetHandler cgi-script
+        Options +ExecCGI
+        Require all granted
+</Directory></pre>
+</code> in <var>~expo/config/apache/expo.conf</var>.
 
 <hr />
 Go on to: 
-<a href="trogintro.html">troggle introduction</a><br />
+<a href="trogintro.html">troggle introduction</a><li>
 Return to: 
-<a href="../computing/onlinesystems.html">expo online systems overview</a><br />
+<a href="../computing/onlinesystems.html">expo online systems overview</a><li>
 <hr />
 </body>
 </html>
