Tornelo has the following user hierarchy:
This is the owner of a rating system - has full access to the entire rating system.
This user has delegated access to create rated tournaments.
This user can only manage group events and players.
These users are tournament arbiters. They have full access to the pairing program.
These users may be the parents of a player, or a player themselves. The player owner has edit access, but still cannot view private information such as birthday.
It is possible for a public user to claim an existing player profile when entering an event.