- students must enrol in every semester: this means setting the status to active or passive in Neptun
- subjects/courses can be registered only by those students who had set their semester to active
- registration to any courses is only valid if it is in Neptun (either by registered by the student in the Neptun web surface within the deadline or registered by the RO based on an accepted late registration request form)
- only those students can attend the classes of a subject whose name is on the course list in Neptun (have a valid registration for the course in Neptun)
