The quality of service (QOS) component implements traffic profiling on the local host computer. It has a system of flows and filters. A flow is essentially a traffic profile specified in the token bucket and leaky bucket model. A filter is a pattern that uniquely identifies the traffic that belongs to this flow. The basic functionality of this component is traffic shaping. The application can send data at any rate but the packets are sent from the host according to the profile specified for the flow.
There are no configuration requirements for this component.
For more information on this component, see this Microsoft Web site.