The Freeciv server is the core of the Freeciv system. It maintains the complete states of all game variables (map, units, cities, research, etc.), updates them based on player client requests, and sends updates to the clients. For multiplayer games it is the central arbiter of the game's progress. For solitaire play, it implements the Artificial Intelligence (AI) races. This document reflects the Freeciv server program for the 1.8.0 build. The general concepts involved will also help in using Freeciv 1.7.2 and earlier versions.