With QuickTime Pro, you can create movies that can be delivered over the Internet. You can deliver a movie as an HTTP download or as a real-time stream. HTTP download�This type of delivery allows website visitors to download the movie to their hard disk. Fast Start is a QuickTime feature that enables users to watch the movie as it's being downloaded (long before the whole movie has been downloaded) from a standard web server. Fast Start works well for short-form movies where file size is limited. It ensures high-quality playback regardless of the users' Internet connection speeds, though those with slower connections will wait longer before media starts to play. Real-time stream�This type of delivery is provided by QuickTime Streaming Server, and delivers media in real time over the Internet, from modem rates to broadband. The file is not downloaded to a viewer's hard disk. Instead, the media is played, but not stored, by the client software as it's delivered. Choose real-time streaming (instead of Fast Start) for webcasts of live events in real time, delivery of long-form video, 24/7 Internet radio and TV channels, and other cases in which you don't want viewers to store the file on their hard disk. QuickTime Streaming Server uses the RTSP protocol.