The first step to modifying Minecraft with the Bukkit API is to install a CraftBukkit server on your Windows PC. A multiplayer server is essentially the same as single-player Minecraft but allows for more customization and is not limited to only people in your home network. The CraftBukkit server will load all of the plugins that you create and use them to change how Minecraft operates. It contains all of the code that is included in the vanilla Minecraft server. Most of these classes, methods, and variables are renamed to help us understand their purpose and how to use them correctly. craftbukkit.jar also includes additional code to aid plugin developers with completing certain tasks such as saving/loading data, listening for server events, and scheduling code to be executed. We will use this CraftBukkit server to test any plugins that you write. By the end of this chapter all your friends can log onto and play on your modified Minecraft server together.