Realtek High Definition Audio XP software (version 2.63 XP) is a driver package for audio devices on Windows XP operating systems. The software includes a control panel that allows users to adjust audio input and output settings, such as speaker configuration and microphone volume. The software also supports stereo sound playback, multi-streaming, and jack-detection. Additionally, the package includes support for various audio codecs and enhancements, including Dolby Digital Live and DTS Interactive.