Here's another way of explaining this technique. I don't know if any of you read any of the Carlos Castaneda books, but they have a way to achieve almost anything. It's called "intent".
Intent is a little hard to describe... It is "wishing without wishing, wanting but without really wanting." It's almost like you just know It's going to happen. They say that everything in the universe is run by this force. Everything that's happening or that will happen is part of the "eagles command" (I'm not going to go into it but they only say eagle because of something that resembles one) The eagles command is effected by intent. So if you strongly put your intent into lucid dreaming it will become the eagles command and it will happen no matter what.