I just got off the phone with "X10pro" in Tampa Florida. I don't know if they're the same company as x10.com or not. They tech support guy told me to call X10 since that's where I bought it. When I told him my story, his response was, "They sold it to you and don't know how to use it? Why did you buy it?" Anyway, he took pity and told me that "Basicly, you must have a US Robotics external modem to program the Pro2000. Otherwise, you'll beat your head against the wall trying to find the right init string until you give up." Which describes, basicly, what I've been doing.
That being said, what I'd like to know now, is... does anyone use the Pro2000 without monitoring? Do they program it? Do they program it with anything other than a US Robotics external modem? What init string do they use?