Each tour has "members" who have earned their "tour cards", meaning they are entitled to play in most of the tour's events. A golfer can become a member of a leading tour by succeeding in an entry tournament, usually called a Qualifying School ("Q-School"); or, by achieving a designated level of success in its tournaments when competing as an invited non-member; or, much rarer, by having enough notable achievements on other tours to make them a desirable member. Membership of some of the lesser tours is open to any registered professional who pays an entry fee.