Said, I knew my friend's ISP address and I knew his computer name( or his IP Address), how can I use Socket API to build a channel? The problem is, every time he will be assigned to different port. I cann't even ring him to ask his port number, as he has to use the telephone line to connect to his ISP.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com