In early virtual worlds gamemasters served as a moderator or administrator; in MUD game masters were called "wizards". Gamemastering in the form found in traditional role-playing games has also been used in a semi-automatic virtual worlds. However, human moderation was sometimes considered unfair or out of context in an otherwise automated world. As online games expanded, gamemaster duties expanded to include being a customer service representative for an online community. A gamemaster in such a game is either an experienced volunteer player or an employee of the game's publisher. They enforce the game's rules by banishing spammers, player killers, cheaters, and hackers and by solving players' problems by providing general customer service. For their tasks they use special tools and characters that allow them to do things like teleport to players, summon items, and browse logs that record players' activities. Often, players who feel dissatisfied with the game will blame the GMs directly for any errors or glitches. However, this blame is misdirected as most GMs are not developers and cannot resolve those types of problems.