will also have additional text stating "Launch Team" in the background. Third-party sites allow users to post a rendered version of their Gamercard as a small Flash applet or JPEG image on any website or Internet forum. Similarly, Mac OS X users can download widgets that display their Xbox Live Gamercard within Mac OS X's Dashboard. These can be downloaded onto any Mac with OS X 10.4 or higher via Apple's widget download page. There are four Gamer Zones; Recreation is for casual gamers, Family is for family-friendly gamers (without profanity, etc.), Pro is for competitive gamers who enjoy a challenge, and Underground is for no-holds-barred gaming where anything goes (as long as it does not violate the Xbox Live Terms of Use). However, in practice these gamer zones are displayed only on the Gamercard of the player, and do not tend to affect the gameplay experience or the matching of players in online games. TrueSkill TrueSkill is a ranking and matchmaking system which was first implemented as part of the Xbox 360's Live services. Developed at Microsoft Research Cambridge (United Kingdom), the TrueSkill ranking system is now used in over 150 titles for the Xbox 360 and in the Games for Windows – Live game Warhammer 40,000: Dawn of War II. It uses a mathematical model of uncertainty to address weaknesses in existing ranking systems such as Elo. For example, a new player joining million-player leagues can be ranked correctly in fewer than 20 games. It can predict the probability of each game outcome, which enhances competitive matchmaking, making it possible to assemble skill-balanced teams from a group of players with different abilities. When matchmaking, the system attempts to match individuals based on their estimated skill level. If two individuals are competing head-to-head and have the same estimated skill level with low estimate uncertainty, they should each have roughly a 50% chance of winning a match. In this way, the system attempts to make every match as competitive as possible. In order to prevent abuse of the system, the majority of ranked games have relatively limited options for matchmaking. By design, players cannot easily play with their friends in ranked games. However, these countermeasures have failed due to techniques such as alternate account(s) and system flaws where each system has its own individual TrueSkill rating. To provide less competitive games, the system supports unranked Player Matches, which allow individuals