The Generic Quality of Service (GQoS) API is a subset of the Winsock 2 API that allows a Winsock application to inform the network of its traffic requirements, enabling entitled applications to receive preferential treatment for their traffic. Existing Winsock applications can be GQoS-enabled by adding or modifying Winsock calls at appropriate places. An application's sending and receiving traffic needs can also be defined by specifying parameters within the QualityOfService (QOS) structure. This article discusses how traffic information is conveyed throughout the network, what kind of QOS structure should be used in your app, and how to set up network configurations for testing GQoS applications.
MSDN Magazine April 2001
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