From the introduction: Welcome to the Living Greyhawk Campaign Sourcebook. This document contains everything that you, as a player or Dungeon Master, need to participate in the largest Living Campaign in the history of the RPGA (Role Playing Games Association). Whether you are new to the concept of a “Living” game or a seasoned veteran you will find answers to all of your questions here. The Living Greyhawk Campaign is a core rules campaign and as such it uses the most current printing of the rulebooks as its basis. This currently consists of the revised version of these books.