说明：   全书收录了五大类函数：窗口管理、图形设备接口、系统服务、国际特性以及网络服务。所有函数均附有功能说明、参数说明、返回值说明、备注以及引用说明。
(The book includes five major functions: window management, graphics device interface, system services, international properties, as well as network services. All functions are accompanied by functional description, parameters that return values that indicate Remarks and references.)