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 descr iption, parameters that return values that indicate Remarks and references.