well, this thread was created pretty long ago. but if you're still curious i will answer.
Hypnosis, is like subliminal messages, but more powerful. Subliminal messages are messages that are invisible to your conscious, but visible to your subconscious. So you would listen to them. But here's the thing. Your subconscious is a genius, if the subliminal messages make messages that tries to harm you, then your subconscious will reject it right away. But hypnosis, im not sure about that. Hypnosis is a powerful thing, you get people in a trance state, and they will be vulnerable.
If your still curious, http://www.google.com should help.