System fields are automatically populated by Fortis. These fields include information like the current date, the username of the person logged in, or the Document ID. System fields are added to the system in the NewField dialog under the Advanced Tab in the Input Source drop down.
Both Fortis and FortisBlue have a reserve licensing feature. With this feature, you can assign a number of licenses to a certain group of users, thereby always allowing members of that group to have access to the repository and leaving the remaining licenses for general use.