CRAS是一个MFC类，它封装了Windows 的远程访问服务（Remote Access Service）。这个类的主要优点是通过LAN便可以连接到Internet，并且不用安装RAS，因为RAS DLLs是动态加载的。-CRAS is an MFC class that encapsulates the Windows Remote Access Service (Remote Access Service). The main advantage of this class can be connected via a LAN to the Internet, and do not install RAS, because RAS DLLs are loaded dynamically.