actually meta, the emperor uses the force to literally shove his conciousness into the new body. He also does this to Bevel Lemsick(sp), everytime somthing of Bevels failed (Death Star, about a gazillion other things) Emperor would kill Bevel. Everytime he shunted the mind from one body to the other. Eventually the emperor would start to become very very creative, like dipping poor bevel in molten nickle.