In order to run any Harmony Server application, a project collaborator must log in to the database using a username that has been created by a server administrator beforehand.
In a studio productions with several project collaborators, each person is typically assigned different tasks, such as ink and paint or compositing. Users should be created for each project collaborator, and these users should be assigned the appropriate user type to make sure they have the proper permissions. For example, an user of the Ink and Paint type can only load a scene in the Paint application, meaning they are not able to make changes to a scene that exceeds their mandate.
By default, a database has two users, usabatch and BATCH. Those users should not be used by project collaborators. They are created when creating a new Harmony Server database to handle batch processing tasks.