How can I prevent visiting students from taking all the seats? Mandy Dough Updated March 27, 2017 22:03 Follow UNC Online permits your registrar to set a seat limit for the number of visiting students from other institutions for each course (instructors can plan capacity requirements with registrars). Related articles What are exchange communities? Where do the courses listed in UNC Online come from? UNC Online Course Regulations Editing Capacity & Availability How do students register for courses?