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I took a slightly different approach and simply wrote a script that checked availability every minute, and then sent me a text message alert when a seat opened up.

(Upperclassmen often switched their schedules around after the priority enrollment deadline ended)

Not as bullet proof as your approach!

Incredible, my university class reg system had un-sanitized input for the class search field so if you knew the SQL you could find exactly how full a class was and dump the whole table of classes without needing to wait for your reg to open.

And pretty sure you could insert your student ID into the class that way too :)

Heck you could probably just kick people out of the class that you didn't want to take it with.

That’s useful. But 30 years ago you could iterate Social Security Numbers.