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-# Multiplayer manual for OpenTTD
-
-Last updated:    2011-02-16
-
-
-## Table of contents
-
-- 1.0) [Starting a server](#10-starting-a-server)
-- 2.0) [Connecting to a server](#20-connecting-to-a-server)
-    - 2.1) [Connecting to a server over the console](#21-connecting-to-a-server-over-the-console)
-- 3.0) [Playing internet games](#30-playing-internet-games)
-- 4.0) [Tips for servers](#40-tips-for-servers)
-    - 4.1)[Imposing landscaping limits](#41-imposing-landscaping-limits)
-- 5.0) [Some useful things](#50-some-useful-things)
-- 6.0) [Troubleshooting](#60-troubleshooting)
-
-
-## 1.0) Starting a server
-
- - Make sure that you have your firewall of the computer as well as possible
-   routers or modems of the server configured such that:
-    - port 3979 is free for both UDP and TCP connections in- and outgoing
-    - port 3978 is free outbound for UDP in order to advertise with the master
-     server (if desired). Otherwise you'll have to tell players your IP.
-    - port 3977 if use of the admin interface is desired (see admin_network.txt)
- - Click "multiplayer" on the startup screen
- - Click "start server"
- - Type in a game name
- - Select the type of game ('LAN/Internet' or 'Internet (advertise)'. With the
-   last one other people are able to see you online. Else they need your IP and
-   port to join)
- - Click "start game", "load game" or "load scenario"
- - Start playing
-
-
-## 2.0) Connecting to a server
-
- - Click "multiplayer" on the startup screen
- - If you want to connect to any network game in your LAN click on 'LAN', then
-   on 'Find Server'
- - If you want to see which servers all online on the Internet, click on
-   'Internet' and 'Find Server'
- - If there were more than one server
-    - select one in the list below the buttons
-    - click on 'join game'
- - If you want to play and you have the ip or hostname of the game server you
-   want connect to.
-    - click add server
-    - type in the ip address or hostname
-    - if you want to add a port use :<port>
- - Now you can select a company and press: "Join company", to help that company
-    - Or you can press "Spectate game", to spectate the game
-    - Or you can press "New company", and start your own company (if there are
-   slots free)
- - You see a progressbar how far you are with joining the server.
- - Happy playing
-
-## 2.1) Connecting to a server over the console
-
- - Open the console and type in the following command:
-    connect `<ip/host>:<port>#<company-no>`
-
-
-## 3.0) Playing internet games
-
- - Servers with a red dot behind it have a different version then you have. You
-   will not be able to join those servers.
-
- - Servers with a yellow dot behind it have NewGRFs that you do not have. You
-   will not be able to join those servers. However, via "NewGRF Settings" and
-   "Find missing content online" you might be able to download the needed
-   NewGRFs after which you can join the server.
-
- - It can happen that a connection is that slow, or you have that many clients
-   connected to your server, that your clients start to loose their connection.
-   Some things you can do about it:
-   - [network] frame_freq:
-     change it in console with: 'set network.frame_freq <number>'
-     the number should be between the 0 and 10, not much higher. It indicates
-     the delay between clicking and showing up. The higher, the more you notice
-     it, but the less bandwidth you use.
-     A good value for Internet-games is 2 or 3.
-
-   - [network] sync_freq:
-     change it in console with: 'set network.sync_freq <number>'
-     the number should be between the 50 and 1000, not much lower, not much
-     higher. It indicates the time between sync-frames. A sync-frame is a frame
-     which checks if all clients are still in sync. When the value it too high,
-     clients can desync in 1960, but the server detects it in 1970. Not really
-     handy. The lower the value, the more bandwidth it uses.
-
-   NB: changing frame_freq has more effect on the bandwidth then sync_freq.
-
-
-## 4.0) Tips for servers
-
- - You can launch a dedicated server by adding -D as parameter.
- - In UNIX like systems, you can fork your dedicated server by adding -f as
-   parameter.
-
- - You can automatically clean companies that do not have a client connected to
-   them, for, let's say, 3 years. You can do this via: 'set autoclean_companies'
-   and 'set autoclean_protected' and 'set autoclean_unprotected'. Unprotected
-   removes a password from a company when it is not used for more then the
-   defined amount of months. 'set autoclean_novehicles' can be used to remove
-   companies without any vehicles quickly.
-
- - You can also do this manually via the console: 'reset_company'.
-
- - You can let your server automatically restart a map when, let's say, year 2030
-   is reached. See 'set restart_game_date' for detail.
-
- - If you want to be on the server-list, enable Advertising. To do this, select
-   'Internet (advertise)' in the Start Server menu, or type in console:
-   'set server_advertise 1'.
-
- - You can protect your server with a password via the console: 'set server_pw',
-   or via the Start Server menu.
-
- - When you have many clients connected to your server via Internet, watch your
-   bandwidth (if you have any limit on it, set by your ISP). One client uses
-   about 1.5 kilobytes per second up and down. To decrease this amount, setting
-   'frame_freq' to 1 will reduce it to roughly 1 kilobyte per second per client.
-
- - OpenTTD's default settings for maximum number of clients, and amount of data
-   from clients to process are chosen to not influence the normal playing of
-   people, but to prevent or at least make it less likely that someone can
-   perform a (distributed) denial-of-service attack on your server by causing
-   an out-of-memory event by flooding the server with data to send to all
-   clients. The major factor in this is the maximum number of clients; with
-   32 clients "only" sending one chat message causes 1024 messages to be
-   distributed in total, with 64 clients that already quadruples to 4096. Given
-   that upstream bandwidth is usually the limiting factor, a queue of packets
-   that need to be sent will be created.
-   To prevent clients from exploiting this "explosion" of packets to send we
-   limit the number of incoming data, resulting in effectively limiting the
-   amount of data that OpenTTD will send to the clients. Even with the default
-   limits it is possible to generate about 70.000 packets per second, or about
-   7 megabit per second of traffic.
-   Given that OpenTTD kicks clients after they have not reacted within about 9
-   seconds from sending a frame update packet it would be possible that OpenTTD
-   keeps about 600.000 packets in memory, using about 50 megabytes of memory.
-   Given that OpenTTD allows short bursts of packets, you can have slightly
-   more packets in memory in case of a distributed denial of service attack.
-   When increasing the amount of incoming data, or the maximum number of
-   clients the amount of memory OpenTTD needs in case of a distributed denial
-   of service attack is linearly related to the amount of incoming data and
-   quadratic to the amount of clients. In short, a rule of thumb for, the
-   maximum memory usage for packets is:
-       #max_clients * #max_clients * bytes_per_frame * 10 KiB.
-
-### 4.1) Imposing landscaping limits
-
- - You can impose limits on companies by the following 4 settings:
-   - terraform_per_64k_frames
-   - terraform_frame_burst
-   - clear_per_64k_frames
-   - clear_frame_burst
-
- - Explaining 'per_64K_frames' and 'burst'
-    - 'burst' defines 3 things, the maximum limit, the limit of a single action,
-      and the initial value for the limit assigned to a new company.
-      This setting is fairly simple and requires no math.
-
-      A value of 1 means a single tile can be affected by a single action.
-      This results in having to click 400 times when wanting to cover an area
-      of 20 x 20 tiles.
-
-      The default value 4096 covers an area of 64 x 64 tiles.
-
-    - 'per_64k_frames' defines the number of tiles added to each companies limit
-      per frame (however not past the possible maximum value,the 'burst').
-      64k rather resembles the exact number of 65536 frames. So setting this
-      variable to 65536 means: 65536 / 65536 = 1 tile per frame.
-      As a day consists of 74 frames, a company's limit is increased by 74
-      tiles during the course of a single day (2.22 seconds).
-
-      To achieve a 1 tile per day increase the following calculation is needed:
-      1 / 74 (frames per day) * 65536 (per_64k_frames) = 885.62...
-      after rounding: a value of 886 means adding a bit over 1 tile per day.
-
-      There is still enough space to scale this value downwards:
-      decreasing this value to 127 results in a bit over 1 tile added to the
-      allowance per week (7 days).
-
-      To create a setup in which a company gets an initial allowance only,
-      set the value to 0 - no increase of the allowance per frame.
-
- - Even though construction actions include a clear tile action, they are not
-   affected by the above settings.
-
-
-## 5.0) Some useful things
-
- - You can protect your company so nobody else can join uninvited. To do this,
-   set a password in your Company Screen
-
- - You can give other players some money via the ClientList (under the 'head'
-   in the mainbar).
-
- - You can chat with other players via ENTER or via SHIFT+T or via the ClientList
-
- - Servers can now kick players, so don't make them use it!
-
-
-## 6.0) Troubleshooting
-
- - My advertising server does not show up in list at servers.openttd.org
-     Run openttd with the '-d net=2' parameter. That will show which incoming
-     communication is received, whether the replies from the master server or
-     communication from an admin tool reach the programme. See section 1
-     'Starting a server' further up for the ports and protocols used by OpenTTD.
-     The ports can be configured in the config file.