 TDI is supported in Windows Vista for backward compatibility.Windows Vista includes a specialized QoS API called qWave ("Quality Windows Audio/Video Experience"), which is a pre-configured Quality of Service module for time dependent multimedia data, such as audio or video streams.qWave uses different packet priority schemes for real-time flows (such as multimedia packets) and best-effort flows (such as file downloads or e-mails) to ensure that real time data gets as little delays as possible, while providing a high quality channel for other data packets.