Desktop computer internet - wireless & no router allowed?

[~? Shih Tzu lover ?~]

Hey,
Just wondering.
I'm going to university next month and won't be getting a laptop until Christmas time. I'm staying in halls and the place I'm staying has wireless and routers aren't allowed. How would a laptop connect to the wireless internet and can a desktop be connected anyway?
If not, I'll use my friend's laptop (if she lets me x])