Audio
Music
Graphic

Using the Window System
Events used by the Window System
Colour codes that exist in OpenTTD
Adding a text box
Understanding the widget focus system

HOWTO - Add a patch option
HOWTO - Do a savegame BUMP

Understanding the Dynamic Landscape Array
Understanding the SaveGame Handler
HOWTO - Create good Scenarios
HOWTO - Add New Town Name Generators

Vehicles
Using Orders
Pathfinding
Ratings
Train Acceleration

Using OpenTTD Strings

Starting a Server

Connecting to a Server

Using the list of LAN/Internet Games

The OpenTTD TCP Protocol
The OpenTTD UDP Protocol
HOWTO - Debug desyncs

The Console Window
Using Console Scripting
HOWTO - Add Functions/Commands to the Console
HOWTO - Add Variables to the Console
HOWTO - Direct Variable Access using ICONSOLE_VAR_POINTER
OpenTTD Console Commands
OpenTTD Console Variables
Development History