quake2 qos

[reaper]

I've got one computer, and when I download things it uses most of the bandwidth.  also there is just a modem and no qos support for it.  What I would like is to use the QOS packet schedule in Windows which basically reserves a percentage of the bandwidth for high priority traffic, probably by dropping packets after a certain rate unless it's in a different queue.  Howerver just looking around briefly I can't tell Windows that port X is high priority traffic  The application would have to tell the scheduler which traffic is high priority.  I suppose I could forward this traffic through a proxy and do the qos in linux or something like that, but can the quake 2 client be set to mark the traffic as high priority to Windows?

I set the rate on my downloads but it only works for some applications, and something like this would probably resolve similar issues.  I see the QOS APIs, maybe I could add it, what's up with this?  Actually looking at this again, I don't think Windows gives the options for how much bandwidth is available past the adapter.  For example, if you have 300kbps DSL and a 100Mbps Ethernet adapter, it will still allow to much best effort traffic and not drop enough.  If it could that would help in cases like this.