xx Personal Content Experience: Managing Digital Life in the Mobile Age TTS text to speech UCD user centric design UI user interface UPnP universal plug and play URI uniform resource identifi er URL uniform resource locator USB Universal Serial Bus USD United States dollars UWB ultra-wide band VGA Video Graphics Array VOIP Voice-Over-Internet Protocol VPN virtual private network VR virtual reality W3C World Wide Web Consortium WAV Waveform audio format Wi-Fi a WLAN that conforms to IEEE 802.11b standards WIMP Windows, Icons, Menus, and Pointing Devices WLAN wireless local area network WMA Windows Media Audio WWW world wide web XML Extensible Markup Language xDSL X digital subscriber line XGA Extended Graphics Array XviD implementation of a MPEG-4 video codec ZUI zoomable user interface