so i just bought apple tv and i am aware that you can stream pictures videos apps ect from your iphone directly to the tv with the apple tv device. this is where im confused. i know with the iphone 4s you can do "air play mirroring". i guess this can only be done with the iphone 4s and the ipad2. that is the difference between regular airplay and airplay mirroring? what can you do with the iphone 4s that you cant do with the regular iphone4 when using apple tv? thanks