There is only one special user, and that is nobody. This is a user whose status should be set to Blocked and never used. This user is used in the following circumstance:

 

Sending automated emails with embedded data:

 

When an Email Workflow Action is run to send an email, it can include data taken from some Biskits. When this happens, to make sure that it is safe to include such information, make sure that the information is only readable by whomever the email goes to, or whomever initiated the action that caused the email to be sent, as it is possible that anybody could read the email. It is therefore better to ensure that emails only include information that is readable by the special user nobody. If the special user nobody can read the data, then it's safe to put it into an email. Your administrator should have set up which data nobody has Permission to read.

 

If a Permission is set up to stop users from running reports, then nobody must be in the Does Not Apply To section in order for scheduled reports to run.

 

Please note that, while there are users created by default that are called Root and Admin, these are not special users. They have a user role of Root and Admin respectively, and their roles are special, but the users are not. As many users with the Root role may be created as required. Any user with the Root role is not subjected to permissions checks, regardless of whether it is the user Root or not; only the roles matter.