Back in the day, before computers and the Internet, class registration was held on campus at the start of the school year and subsequent academic terms. I recall standing on the hallowed floor of Recreation Hall at Penn State in early September 1969, among thousands of my closest classmates, trying to get a registration card for classes to fill out my fall term schedule. Back then, terms at Penn States were 10 weeks, which was fairly brutal when trying to cover a topic comprehensively.
Today, things are a lot different. Registration can be handled from the comfort of your bedroom as early as spring of your senior high school year. Quite a difference from standing in line on a gym floor.