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author | toma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da> | 2009-11-25 17:56:58 +0000 |
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committer | toma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da> | 2009-11-25 17:56:58 +0000 |
commit | bcb704366cb5e333a626c18c308c7e0448a8e69f (patch) | |
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
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git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdenetwork@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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diff --git a/doc/lisa/index.docbook b/doc/lisa/index.docbook new file mode 100644 index 00000000..d93e31d5 --- /dev/null +++ b/doc/lisa/index.docbook @@ -0,0 +1,694 @@ +<?xml version="1.0" ?> +<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [ + <!ENTITY lisa "<application>LISa</application>"> + <!ENTITY package "kdenetwork"> + <!ENTITY reslisa "<application>resLISa</application>"> + <!ENTITY kappname "&lisa;"><!-- replace kapp here --> + <!ENTITY % addindex "IGNORE"> + <!ENTITY % English "INCLUDE"><!-- change language only here --> +]> + +<book lang="&language;"> + +<bookinfo> + +<title>The &lisa; Handbook</title> + +<authorgroup> +<author> +<firstname>Alexander</firstname> +<surname>Neundorf</surname> +<affiliation> +<address><email>neundorf@kde.org</email></address> +</affiliation> +</author> + +<!-- TRANS:ROLES_OF_TRANSLATORS --> + +</authorgroup> + +<copyright> +<year>2001</year> +<holder>Alexander Neundorf</holder> +</copyright> + +<date>2001-07-07</date> +<releaseinfo>0.01.00</releaseinfo> + +<abstract> +<para>&lisa; is intended to provide a kind of <quote>network +neighborhood</quote>, but only relying on the TCP/IP protocol stack, no +<acronym>SMB</acronym> or anything else required.</para> + +<para>This is the handbook to both the <acronym>LAN</acronym> +Information Server (&lisa;) and the Restricted <acronym>LAN</acronym> +Information Server (&reslisa;)</para> + +</abstract> + +<keywordset> +<keyword>KDE</keyword> +<keyword>kdenetwork</keyword> +<keyword>LAN</keyword> +<keyword>network</keyword> +<keyword>network neighborhood</keyword> +</keywordset> + +</bookinfo> + +<chapter id="introduction"> +<title>Introduction</title> + +<para>&lisa; is intended to provide a kind of <quote>network +neighborhood</quote>, but only relying on the TCP/IP protocol stack, no +smb or whatever.</para> + +<para>It is completely independent from &kde;/&Qt;.</para> + +<para>The list of running hosts is provided via <acronym>TCP</acronym> +port 7741.</para> + +<para>&lisa; supports two ways of finding hosts:</para> + +<orderedlist> +<listitem> +<para>You give &lisa; a range of <acronym>IP</acronym> addresses, then +&lisa; will send <acronym>ICMP</acronym> echo requests to all given +<acronym>IP</acronym> addresses, and wait for the answers.</para> +</listitem> +<listitem> +<para>You can tell &lisa; to execute <command>nmblookup</command> +<option>"*</option>. The command line tool +<command>nmblookup</command> must be installed from the Samba package. +<command>nmblookup</command> <option>"*"</option> sends a broadcast to +the attached networks, and all hosts running <acronym>SMB</acronym> +services will answer this broadcast.</para> +</listitem> + +</orderedlist> + +</chapter> + +<chapter id="how-it-works"> +<title>How it works</title> + +<para>In the configuration file you provide a range of IP-addresses +which &lisa; should check to see whether they are running.</para> + +<para>In the most simple case this could be your network +address/subnetmask, then &lisa; would check every possible host of your +network to see if it is running.</para> + +<para>The hosts are checked using <acronym>ICMP</acronym> echo +requests. To be able to send and receive <acronym>ICMP</acronym> echo +requests and replies the program has to open a so-called <quote>raw +socket</quote>. Therefore it needs <systemitem +class="username">root</systemitem> privileges. This socket is opened +right after the start of the program, after successfully opening the +socket root privileges are dropped immediately (see +<filename>main.cpp</filename> and +<filename>strictmain.cpp</filename>).</para> + +<para>If you configure &lisa; so that it also uses +<command>nmblookup</command>, it will <literal>popen("nmblookup +\"*\"")</literal> and then parse the results.</para> + +<para>Since the <acronym>ICMP</acronym> requests and the broadcasts can +cause some network traffic if there are more than one such server +running in one network, the servers cooperate with each other. Before +they start pinging (or <command>nmblookup</command>), they send a +broadcast on port 7741.</para> + +<para>If somebody answers this broadcast, they will retrieve the +complete list of running hosts via <acronym>TCP</acronym> port 7741 from +this host and will not start to ping (or +<command>nmblookup</command>).</para> + +<para>If nobody answers, the host which sent the broadcast will start +pinging the hosts (or <command>nmblookup</command>) and then open a +socket which listens for the mentioned broadcasts. If the host received +an answer to his broadcast, it won't have the socket for listening to +the broadcasts open. So usually exactly one of the servers will have +this socket open and only this one will actually ping (or +<command>nmblookup</command>) the hosts. </para> + +<para>In other words, the servers are lazy, they work like <quote>I will +only do something if nobody else can do it for me</quote>.</para> + +<para>There is another feature which reduces the network load.</para> + +<para>Let's say you configured &lisa; to update every 10 minutes. Now +you don't access your server very often. If nobody accesses the server +for the last update period, the server will update (either itself or +from the one which actually does the work) and then double its update +period, &ie; the next update will happen after 20 minutes.</para> + +<para>This will happen 4 times, so if nobody accesses the server with +update period 10 minutes for a long time, its update interval will +increase up to 160 minutes, almost three hours. If then somebody +accesses the data from the server, he will get an old list ( up to 160 +minutes old). With accessing the server will reset its update interval +to its initial value, &ie; 10 minutes and immediately start updating if +the last update is more than these 10 minutes over. This means if you +get a very old list, you can try some seconds later again and you should +get a current version.</para> + +<para>This will have fast effect for the servers, which don't ping (or +nmblookup) theirselves, since only one user usually accesses them, and +it will have less effect for the server which does the pinging (or +<command>nmblookup</command>), since this server is accessed from all +other servers in the network.</para> + +<para>This way it is possible that many hosts in a network run this +server, but the net load will remain low. For the user it is not +necessary to know wether there is a server (&ie; a name server or +fileserver or whatever) in the network which also runs &lisa;. He can +always run &lisa; locally and &lisa; will detect if there is one, +transparently to the user.</para> + +<para>The first client for &lisa; is an ioslave for &kde; 2, so the user +can enter there <userinput>lan://localhost/</userinput> or +<userinput>lan:/</userinput>, which will both contact &lisa; on the own +system.</para> + +<para>If there is a machine which runs all the time and the user knows +that this machine also runs &lisa;, he can use his &lisa; client +directly with this server (would be with the mentioned ioslave +<userinput>lan://the_server_name/</userinput>).</para> + +<para>If you don't want that your &lisa; takes part in the broadcasting, +but always does the pinging itself, make it use another port with the +command line option <option>--port</option> or <option>-p</option>. This +is not recommended!</para> + +<para>If you send <command>SIGHUP</command> to &lisa;, it will reread +its configfile. If you send <command>SIGUSR1</command> to &lisa;, it +will print some status information to stdout.</para> + +<para>The data provided over the socket has a simple format: + +<computeroutput><decimal ip address in network byte order><one space +0x20><full name of the host><a terminating +'\0'><newline '\n'<</computeroutput> +and the last line +<computeroutput>0 succeeded<'\n'></computeroutput> +</para> + +<para>For example,</para> + +<screen><computeroutput>17302538 some_host.whatever.de +18285834 linux.whatever.de +17827082 nameserver.whatever.de +0 succeeded</computeroutput></screen> + +<para>This should make it easy parseable.</para> + +<para>If there are very strict security rules in your network, some +people might consider the pinging a potential attack. If you have +problems with this, try the restricted version, &reslisa;.</para> + +</chapter> + +<chapter id="reslisa"> +<title>&reslisa;</title> + +<para>If you hav very strict security rules in your network or you don't +want to have another port open or whatever, you can use +&reslisa;.</para> + +<para>With &reslisa; you can't ping whole networks and address ranges, +you can give &reslisa; up to currently 64 hosts by their names in its +config file. These will be pinged. You are still able to use +<command>nmblookup</command>.</para> + +<para>&reslisa; will also only provide the information over a unix +domain socket, &ie; not over the network. The name of the socket is +<filename>/tmp/resLisa-YourLoginname</filename> so &reslisa; can be +safely run by more users on one machine.</para> + +<para>Since it should also not produce a security risk of any kind it is +safe to install &reslisa; setuid <systemitem +class="username">root</systemitem>. <systemitem +class="username">root</systemitem> privileges will be dropped right +after startup (see <filename>strictmain.cpp</filename>), they are only +needed to create a raw socket for sending the <acronym>ICMP</acronym> +echo requests.</para> + +<para>It will also not send or receive broadcasts. The first client for +this is also an ioslave for &kde; 2 (<userinput>rlan:/</userinput> in +&konqueror; for example.)</para> + +</chapter> + +<chapter id="config-file-format"> +<title>The Configuration File</title> + +<para>Now an example config file:</para> + +<screen> +PingAddresses = 192.168.100.0/255.255.255.0;192.168.100.10-192.168.199.19;192.168.200.1;192-192.168-168.100-199.0-9; +PingNames = bb_mail; +AllowedAddresses = 192.168.0.0/255.255.0.0 +BroadcastNetwork = 192.168.100.0/255.255.255.0 +SearchUsingNmblookup = 1 #also try nmblookup +FirstWait = 30 #30 hundredth seconds +SecondWait = -1 #only one try +#SecondWait = 60 #try twice, and the second time wait 0.6 seconds +UpdatePeriod = 300 #update after 300 secs +DeliverUnnamedHosts = 0 #don't publish hosts without name +MaxPingsAtOnce = 256 #send up to 256 ICMP echo requests at once +</screen> + +<sect1 id="pingaddresses"> +<title><option>PingAddresses</option></title> + +<para>This is probably the most important entry.</para> + +<para>Here you say which addresses will be pinged. You can specify +multiple ranges, they are divided by semicolons.</para> + +<para>There are four possible ways to define addresses:</para> + +<variablelist> +<varlistentry> +<term>net address/network mask</term> +<listitem> +<para>192.168.100.0/255.255.255.0, &ie; an <acronym>IP</acronym> address + and the assigned network mask.</para> + +<para>This doesn't have to be the network address and netmask of your +machine. For example, if you have 10.0.0.0/255.0.0.0 as your own +address, you could specify 10.1.2.0/255.255.255.0 if you are only +interested in these addresses. The combination <acronym>IP</acronym> +address-network mask must be divided by a slash <quote>/</quote> and the +address does not have to be a real network address, it can also be a +host address of the desired network, &ie; 10.12.34.67/255.0.0.0 is the +same as 10.0.0.0/255.0.0.0 .</para> +</listitem> +</varlistentry> + +<varlistentry> +<term>a range of <acronym>IP</acronym> addresses</term> +<listitem> +<para>For example: 192.168.100.10-192.168.199.19</para> + +<para>An <acronym>IP</acronym>-address where pinging will start and an +<acronym>IP</acronym>-address where pinging will end.</para> + +<para>Both addresses must be divided by a <quote>-</quote>.</para> + +<para>In this example this would produce 199-100+1=100, 100*256=25.600, +25.600+(19-10+1)=25.590 addresses</para> +</listitem> +</varlistentry> + +<varlistentry> +<term>An <acronym>IP</acronym> address, as represented by ranges of each +of the four decimal numbers</term> +<listitem> +<para>An <acronym>IP</acronym> address can be represented by its four +decimal numbers, and you can specify ranges four each of these four +numbers: 192-192.169-171.100-199.0-9 +</para> + +<para>In this example all <acronym>IP</acronym> addresses with first +number 192, second number from 168 to 168, third number from 100 up to +199 and last number from 0 up to 9 will be pinged. This would give +1*1*100*10=1.000 addresses.</para> + +<para>This is probably only useful in very seldom cases. Here you have +to provide ranges for every four numbers, always divided by +<quote>-</quote>.</para> +</listitem> +</varlistentry> + +<varlistentry> +<term>Single <acronym>IP</acronym> addresses or host names</term> +<listitem> +<para>The <acronym>IP</acronym> address or host name of any machine you +are particularly interested in.</para> +</listitem> +</varlistentry> +</variablelist> + +<para>It is also valid to leave this entry empty.</para> + +</sect1> + +<sect1 id="pingnames"> +<title><option>PingNames</option></title> + +<para>Here you can additionally specify hosts to ping using their names. +The names have to be divided by semicolons.</para> + +<para>It is also valid to leave this entry empty.</para> + +</sect1> + +<sect1 id="allowedaddresses"> +<title><option>AllowedAddresses</option></title> + +<para>This is also very important. &lisa; will only ping addresses, +accept clients and answer broadcasts from addresses, which are covered +by the addresses given in this line. You can add up to 32 network +addresses/network masks or single addresses. Divide them by ; and don't +put empty space between the addresses!</para> + +<para>For example, 192.168.0.0/255.255.0.0;192.169.0.0</para> + +<para>A complete network and a single address are valid. Always make +this as strict as possible, usually your network address/subnetmask is a +good choice.</para> + +</sect1> + +<sect1 id="broadcastnetwork"> +<title><option>BroadcastNetwork</option></title> + +<para>This entry contains exactly one network address/subnet mask. To +this network broadcasts will be sent. Usually this should be your own +network address/subnetmask, for example: 192.168.0.0/255.255.0.0</para> + +</sect1> + +<sect1 id="searchusingnmblookup"> +<title><option>SearchUsingNmblookup</option></title> + +<para>Here you can give <parameter>0</parameter> or +<parameter>1</parameter>. <parameter>1</parameter> means that &lisa; +will execute <command>nmblookup</command> <option>"*"</option> and parse +the output from this command. This produces less network traffic than +the pinging, but you will only get hosts which have a +<acronym>SMB</acronym> service running (&Windows; machines or machines +running samba).</para> + +<para>If you enable this option and also give <acronym>IP</acronym> +addresses to ping, then <command>nmblookup</command> will be executed +first and then the pinging will start. Then only addresses will be +pinged, which were not already delivered from +<command>nmblookup</command>. This should slightly decrease the network +load.</para> + +</sect1> + +<sect1 id="firstwait"> +<title><option>FirstWait</option></title> + +<para>If &lisa; pings, &ie; if it sends the <acronym>ICMP</acronym> echo +requests, it sends a bunch of requests at once, and the it will wait for +the number of hundredth seconds you specify here. Usually values from 5 +to 50 should be good, the maximum is 99 (gives 0.99 seconds, a very long +time). Try to make this value as small as possible while still finding +all running hosts.</para> + +</sect1> + +<sect1 id="secondwait"> +<title><option>SecondWait</option></title> + +<para>After &lisa; has sent the echo requests the first time, it can be +possible that some hosts were not found. To improve the results, &lisa; +can ping a second time. This time it will only ping hosts, from which it +didn't receive answers. If you have good results with pinging only once, +you can disable the second time with setting SecondWait to +<userinput>-1</userinput>.</para> + +<para>Otherwise it might be a good idea to make this value a little bit +bigger than the value for <option>FirstWait</option>, since the hosts +which were not found on the first try, are probably slower or further +away so they might take some milliseconds longer to answer. Usually +values from 5 to 50 should be good or -1 to disable the second scan. +The maximum is 99 (gives 0.99 seconds, a very long time).</para> + +</sect1> + +<sect1 id="updateperiod"> +<title><option>UpdatePeriod</option></title> + +<para>This is the interval after which &lisa; will update. After this +time &lisa; will again ping or <command>nmblookup</command> or get the +list of hosts from the &lisa; server which actually does the +pinging.</para> + +<para>Valid values are between 30 seconds and 1800 seconds (half an +hour). If you have a big network, don't make the interval too small (to +keep network load low). Values from 300 to 900 seconds (5 to 15 minutes) +might be a good idea.</para> + +<para>Keep in mind that the update period is doubled if nobody accesses +the server, up to 4 times, so the interval will become 16 times the +value given here and will be reseted to the value given here if somebody +accesses the server.</para> + +</sect1> + +<sect1 id="deliver-unnamed-hosts"> +<title><option>DeliverUnnamedHosts</option></title> + +<para>If an answer to an echo request from an IP address was received, +were &lisa; could not determine a name, it will be only delivered over +the port if you set this to 1.</para> + +<para>I am not really sure if this is a useful feature, but maybe there +are some infrastructure devices in your network without assigned names, +so they don't have to be published. Set this to 0 if you want to keep +them secret ;-) If unsure, say 0.</para> + +</sect1> + +<sect1 id="max-pings-at-once"> +<title>MaxPingsAtOnce</title> + +<para>When sending the pings (echo requests), &lisa; sends a bunch of +these at once and then waits for the answers. By default there are 256 +pings sent at once, usually you should not need the change this +value. If you make it much bigger, the internal receive buffers for the +answers to the echo requests may become to small, if you make it to +small, the updating will be slower.</para> + +</sect1> + +<sect1 id="examples"> +<title>Three more example files</title> + +<example> +<title>FIXME</title> + +<para>You are member of a small network with 24 bit network mask, &ie; +up to 256 hosts:</para> + +<screen> +PingAddresses = 192.168.100.0/255.255.255.0 +AllowedAddresses = 192.168.100.0/255.255.255.0 +BroadcastNetwork = 192.168.100.0/255.255.255.0 +SearchUsingNmblookup = 0 #don't use nmblookup +FirstWait = 20 #20 hundredth seconds +SecondWait = 30 #30 hundredth seconds on the seconds try +UpdatePeriod = 300 #update after 300 secs +DeliverUnnamedHosts = 0 #don't publish hosts without name +</screen> + +</example> + +<example> +<title>Configuration file for hosts running <acronym>SMB</acronym> +only</title> + +<para>You are only interested in hosts running <acronym>SMB</acronym> +services and you don't have routers in your network:</para> + +<screen> +AllowedAddresses = 192.168.100.0/255.255.255.0 +BroadcastNetwork = 192.168.100.0/255.255.255.0 +SearchUsingNmblookup = 1 #use nmblookup +UpdatePeriod = 300 #update after 300 secs +DeliverUnnamedHosts = 0 #don't publish hosts without name +</screen> +</example> + +<example> +<title>Configuration file using both <command>nmblookup</command> and +pinging</title> + +<para>The same network, but here both nmblookup and pinging is +used.</para> + +<screen> +PingAddresses = 192.168.100.0/255.255.255.0 +PingNames = bb_mail +AllowedAddresses = 192.168.0.0/255.255.0.0 +BroadcastNetwork = 192.168.100.0/255.255.255.0 +SearchUsingNmblookup = 1 #also try nmblookup +FirstWait = 30 #30 hundredth seconds +SecondWait = -1 #only one try +#SecondWait = 60 #try twice, and the second time wait 0.6 seconds +UpdatePeriod = 300 #update after 300 secs +DeliverUnnamedHosts = 0 #don't publish hosts without name +MaxPingsAtOnce = 256 #send up to 256 ICMP echo requests at once +</screen> + +</example> + +<example> +<title>Configuration file for &reslisa;</title> + +<para>And now a configuration file for &reslisa;, PingAddresses is not +used by &reslisa;, neither is BroadcastNetwork.</para> + +<screen> +PingNames = bb_mail;some_host;some_other_host +AllowedAddresses = 192.168.0.0/255.255.0.0 +SearchUsingNmblookup = 1 # use nmblookup +FirstWait = 30 #30 hundredth seconds +SecondWait = -1 #only one try +#SecondWait = 60 #try twice, and the second time wait 0.6 seconds +UpdatePeriod = 300 #update after 300 secs +DeliverUnnamedHosts = 1 #also publish hosts without name +MaxPingsAtOnce = 256 #send up to 256 ICMP echo requests at once +</screen> + +</example> +</sect1> +</chapter> + +<chapter id="command-line-options"> +<title>Command Line Options and Other Usage</title> + +<para>The following command line options are supported:</para> + +<variablelist> +<varlistentry> +<term><option>-v</option>, <option>--version</option></term> +<listitem> +<para>Prints brief version information.</para> +</listitem> +</varlistentry> + +<varlistentry> +<term><option>-h</option>, <option>--help</option></term> +<listitem> +<para>Gives an overview of the command line options</para> +</listitem> +</varlistentry> + +<varlistentry> +<term><option>-u</option>, <option>--unix</option></term> +<listitem> +<para>Search at first for +<filename>$<envar>HOME</envar>/.lisarc</filename>, then for +<filename>/etc/lisarc</filename>. This is the default behavior.</para> +</listitem> +</varlistentry> + +<varlistentry> +<term><option>-k</option>, <option>--kde1</option></term> +<listitem> +<para>Search first for +<filename>$<envar>HOME</envar>/.kde/share/config/lisarc</filename>, then +for +<filename>$<envar>KDEDIR</envar>/share/config/lisarc</filename>.</para> +</listitem> +</varlistentry> + +<varlistentry> +<term><option>-K</option>, <option>--kde2</option></term> +<listitem> +<para>Looks for the file <filename>lisarc</filename> in every folder +returned by running <userinput><command>kde-config</command> +<option>--path</option> <parameter>config</parameter></userinput></para> +</listitem> +</varlistentry> + +<varlistentry> +<term><option>-c</option>, +<option>--config=</option><parameter>FILE</parameter></term> +<listitem> +<para>Read <parameter>FILE</parameter> and no other configuration +file.</para> +</listitem> +</varlistentry> + +<varlistentry> +<term><option>-p</option>, <option>--port</option> +<parameter>PORTNR</parameter></term> +<listitem> +<para>Start the server on this portnumber. If you use this, &lisa; +won't be able to cooperate with other &lisa;'s on the network. This +option is not available for &reslisa;</para> +</listitem> +</varlistentry> + +</variablelist> + +<para>If you send the Hangup-Signal to &lisa; or &reslisa;, it will reread its +configuration file (<userinput><command>killall</command> <option>-HUP +lisa</option></userinput>).</para> + +<para>If you send the User1-Signal to &lisa; or &reslisa;, it will print +some status information to the standard output +(<userinput><command>killall</command> <option>-USR1 +lisa</option></userinput>). You won't see anything if the console from +which &lisa;/&reslisa; was started has terminated.</para> + + + +</chapter> + +<chapter id="credits-and-license"> +<title>Credits and Licenses</title> + +<para>&lisa; and &reslisa; copyright 2000, 2001, Alexander +Neundorf</para> + + + +<!-- TRANS:CREDIT_FOR_TRANSLATORS --> + +<para>Have fun, Alexander Neundorf <email>neundorf@kde.org</email></para> + +&underFDL; +&underGPL; + +</chapter> + +<appendix id="installation"> +<title>Installation</title> + +<para>&lisa; and &reslisa; need a libstdc++ (it uses only the +string-class from it), it <emphasis>does not</emphasis> need either &Qt; +nor &kde;.</para> + +&install.compile.documentation; + +<sect1 id="other-requirements"> +<title>Other Requirements</title> + +<para>Both &reslisa; and &lisa; open a so called <quote>raw +socket</quote> to send and receive <acronym>ICMP</acronym> echo requests +(pings). To do this, they need <systemitem +class="username">root</systemitem> privileges.</para> + + +<para>&lisa; offers a service on <acronym>TCP</acronym> port 7741, and +should be installed by <systemitem class="username">root</systemitem> +and started when the system comes up. It depends greatly on your &OS; +how to achieve this.</para> + +<para>&reslisa; is intended to be started per user, it doesn't offer +anything to the network. It needs to be installed setuid <systemitem +class="username">root</systemitem>.</para> + +<para>If you use the <userinput>rlan</userinput> ioslave from &kde; 2, +&reslisa; can be started automatically.</para> + +<para>&lisa; reads the file <filename>lisarc</filename>, &reslisa; reads +the file <filename>reslisarc</filename>. If you want to be able to +configure both from &kcontrol;, you have to start them using the command +line switch <option>-K</option>.</para> + +<para>For more information where they look for configuration files read +the chapter on <xref linkend="command-line-options"/>.</para> + +</sect1> +</appendix> +</book> |