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L2J Server divides in two components, L2j Game Server and L2j Login Server, at the same time L2j Game Server is divided in Core and Datapack, the Core is the Java code that defines the game mechanics, persistence and communication mechanics, and the Datapack is composed by all the files that are related to the game play such as dialogs, quest scripts, AIs, etc.

Installing the server requires to install additional software first (Java, database, Git, etc), then get the source code, compile the source code, install the database, deploy the compiled server files, minimum configurations and start the server and test.