My university had a queuing system used for presenting assignments. You could always access the page, but the queue wasn't open unless the TAs were there ready

My university had a queuing system used for presenting assignments. You could always access the page, but the queue wasn't open unless the TAs were there ready to take assignments. When the queue opened it would send a websocket message, so I made a browser extension that connected and waited for the queue open message and then immediately entered the queue. The effect wasn't huge (even in larger classes you would only have to wait 20-30 minutes even if you entered late) but it was nice to be able to sit back and not worry about getting a good spot.