I just graduated in May, but I can think of a few things.
With our computer labs, it differed. The one in the Rendezvous was big and open, and it was definitely first-come, first-served. You could do whatever you wanted on the computer, basically. The one in the library and the ones in some of the classroom buildings however were supposed to be focused on schoolwork. I'm not sure what anyone could do if you didn't, however.
Also, a lot of the labs in the classroom buildings were reserved for classes. Rendezvous lab was never reserved.
For classes--I always hated when people really whipped out their cell phones or played solitaire on their computer in class. It's one thing to play a quick game when you're in the back row, but when you're in the front row of class, everyone behind you can see
. And it's one to answer a quick text under the table/desk. Quite another to carry on a whole conversation, with the cell phone blatantly in front of you, like you aren't paying attention at all.
As for residential life, I noticed a lot of freshmen didn't seem to understand this. Just because you're in college doesn't mean the rules of common courtesy and politeness fly out the window. Of course you can "go crazy" and stay up all hours of the night. But you better be darn quiet after about midnight, or your roommates and your neighbors down the hall are going to hate you.
Particularly when you invite your friends over for noisy video games in the living room during finals week.