Bandwidth Management for Software

Is there a utility out there that would allow you to allocate specific amounts of bandwidth any software could use? In many download managers (such as Speed Download, Limewire, Azul, etc.) you can easily set the total amount of bandwidth and even per file download parameters. I have always been surprised that browsers such as Safari and even iTunes does not allow you to control the amount of bandwidth it is to use when downloading.
I often find myself in situations where I need to download a large file, and yet be able to continue to surf for example, or else I would like to keep the setting in my iTunes to download podcasts automatically when I launch it. Both Safari and iTunes, will take as much bandwidth as you can throw at them which means that it can grind every other on line activity to a halt (specially when you do not have a blazing fat connection).
Anyone know of any such software?
Thanks.

Shahin wrote:
Thanks, but I don't understand what this has to do with bandwidth management? Perhaps I do not understand the capabilities of nice, but isn't nice just a way to prioritize applications and services? How would you use it to allocate bandwidth?
By giving various jobs different priorities, the effective bandwidth is limited. If you use 100% of the bandwidth for 1% of the time and 0% of the bandwidth for 99% of the time, you are effectively giving the "niced" app only 1% of your bandwidth. And since a computer is digital, there is really no such thing as "instantaneous" bandwidth, as there is in other areas of communication.
If you have 10 processes running and each consumes 10% of your total bandwidth, it does not matter whether the processes are time-shared or bandwidth-limited, when considered over any reasonable period of time.

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