hi - i hope someone can help me! here's my scenario: i have mac pro with 10.6.2 running and the have a wi-fi router installed to the mac pro via cable ethernet. i also have 2 other computers running windows 7 and they both connect to the internet wirelessly. i want to know if there's a mac program i can installed that allows me to limit the amount of internet usage the other computers are using. the issue is i have a limit of 20GB per month, and would like to let the other computers running windows to each have a internet usage limit of 5GB per month - or if someone knows how to do it via mac os x, please give me the exact instructions - thanks again!!