I can't help you out on that specific program, but there's a program called
RealVNC that will let you connect to multiple computers through one static or dynamic external IP address. You can assign display numbers to each computer that you want to monitor. That way, you can be at another location, and still monitor multiple computers, all using one destination IP, it would be like 65.66.132.45:0 for computer 0, 65.66.132.45:1 for computer 1, 65.66.132.45:2 for computer 2, etc. It's also cross platform. Mac, Unix, Linux, Windows, Java, etc. you name it they've got it. So you won't have to worry about compatibility issues.
HTH,
David