本源代码介绍了怎样使用WINDOWS API函数直接编写MODEM通讯程序。-The source code introduced how used WINDOWS the API function directly compiles the MODEM communication procedure.

tsp的一个简单例子，供需要写tsp的参考，源码来自windows telephony programming随书源代码-1. How do I write a TSP? The most common way to write a TSP is to take the source code for an existing TSP and use it as a template for writing a new one.

windows 远程拨号源代码，通过实例介绍了一些RAS函数的调用方法。-windows remote dial-up source code