这个手册描述的是为开放源码的Darwin流媒体服务器创建QuickTime流媒体服务器（QTSS）模块所需要的编程接口，版本为4.0。QTSS编程接口为开发者提供了一种易于使用的开发方式，用于为流媒体服务器添加新的功能。这个版本的编程接口和版本5的QuickTime流媒体服务器互相兼容。-This manual describes the open source Darwin Streaming Server QuickTime Streaming Server to create (QTSS) modules required for the programming interface, version 4.0. QTSS programming interface provides developers with an easy to use development mode, used for streaming media server to add new features. This version of the programming interface and Version 5 of QuickTime streaming media server compatible.