"The hypnotist takes into confidence his subject through his confident posture, compassionate behavior and positive dialogue. The psychological supremacy over the subject is achieved by the hypnotist indirectly through his conscious speech and gestures. This communication will help the hypnotist to gain the confidence of the listener that will ultimately develop an unconscious neurological coordination between the hypnotist and the subject known as covert conditioning or covert anchoring. This state of mind of the subject will help the hypnotist to dominate the thoughts and behaviors of the subject.
The person practicing these techniques will be able to influence the thoughts of other persons make them agree to his point of view.  By using this method of hypnotism it is easy to make a person obey the commands of the person practicing this technique of hypnotism.  Whether hypnotizing a person without his consent is ethical or not is a question that is yet to be answered. The preachers of covert hypnosis claim that learning these techniques will help a person to bring miraculous changes to the life of the person practicing it." http://www.hypnotismsecrets.com/covert-hypnosis