This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
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.