Basketball is truly "everyone's game," and there are several ways to become involved, ranging from being a "fan" to actively engaging as a player, coach, or technical official. The technical officials' responsibility is to guarantee that the game is played fairly, safely, and within the regulations. They also call penalties for infractions of the rules, such as shooting fouls after they have been called by a referee. Technical officials work games at all levels from youth to college to the NBA. They are essential to the game because they ensure that it is being played according to the rules. They make sure that players do not exceed their two-minute limit for rest periods, that players do not use illegal shots (such as a behind-the-back dribble), and that players do not charge the court during free throws. Technical officials are responsible for calling flags for off-ball violations (i.e., those that do not involve the ball) such as excessive hand-checking or charging. They may also call timeouts if there is significant action occurring on the floor during dead balls (i.e., situations where no play is allowed). There are three types of technical officials: backcourt, midcourt, and line judges. Backcourt officials are responsible for monitoring play throughout the entire court including the free throw line, half-court line, and sidelines. Midcourt officials are responsible for maintaining a fair balance of play in the middle of the court between teams.