Giving a priority of network traffic for one application over the other; in practice (windows)
Two applications execute network i/o simultaneously. As an example, Firefox and also Download Accelerator.
The suggestion is to allow offer the line up of packages of Firefox before offering those of Download Accelerator. (Well, mostly all the moment bdsh permit a section of those of Download Accelerator ahead via to avoid damaging the links)
It is no worry to configure them both to make use of a neighborhood proxy (possibly with various qualifications).
Which neighborhood proxy, a firewall program or
I assume the magic expression you intend to google is "traffic shaping".
It is feasible to construct a shaper with Linux and also iptables, or you can invest suitably huge quantities of cash to acquire a device (as an example from Packeteer) to do the work for you.