There are 3 computers in my house, and I have Spector installed on only one of them- my computer- so that I can see what other people do with my computer while I am away. And it has been informative- It has shown me that several of the people around me cannot keep their word, as well as that the neighbor kid has used my computer to surf porn sites while I was out of town. Monitoring programs are like hidden cameras, hidden microphones, 1-way mirrors, and the same sort of ethics apply to them.