Limiting internet usage - Per computer

Is there a way to limit internet usage for individual computers on a network? The situation being people come to my house with laptops. Can I cap how much that laptop can download? Can I also cap its bandwidth?

Under Windows 7.

Thanks for anyone who takes time to read and reply. :)
The OS doesn't matter, only your router matters. Open your router control panel (usually or whatever is on the side of the router) and see if there are settings for it. You may need to buy a router that supports it or update its firmware.
You could also type in the router's address which most cases is or
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