To add to Karl's info:
Users can be defined Globally for the whole office. So you do not have to define Users for each individual Project. They are defined in the BIM Server Manager application and they each have a default Role. Then they can Join any Project on that Server using the default Role (such as Draftsman or Lead Architect) assigned to them.
Also, Roles can be customized on the Project level. So maybe a User has the Draftsman Role as default but for a certain Project he is given additional rights: this is accomplished by customizing his/her Role for that particular Project.
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