No, the router/switch will only distribute the bandwidth between the computers. If one computer is using more bandwidth than the others it will just take theirs. I'm not sure how you would go about throttling the bandwidth to a computer- maybe one of the network guru's could help you better.
It would help if you could supply some more details for us to work with
What opeating system are you using, your presnt connection method etc
/Daft admin see's irj's post count and removes the welcome to BetaONE message :P