Another use for virtual worlds has been in business communications. Benefits from virtual world technology such as photo realistic avatars and positional sound create an atmosphere for participants that provides a less fatiguing sense of presence. Enterprise controls that allow the meeting host to dictate the permissions of the attendees such as who can speak, or who can move about allow the host to control the meeting environment. Several companies are creating business based virtual worlds including Second Life. These business based worlds have stricter controls and allow functionality such as muting individual participants, desktop sharing, or access lists to provide a highly interactive and controlled virtual world to a specific business or group. Business based virtual worlds also may provide various enterprise features such as Single Sign on with third party providers, or Content Encryption.