Unbelievable smoothly Remote Desktop iPhone Client

I have just found this tools, slight but very useful, unbelievable smoothy, you can find it in app store, search "remote desktop". i just wonder, how can i use it without local network？ IMG_0731.PNG (38.44 KiB) Viewed 14926 times IMG_0733.PNG (205.94 KiB) Viewed 14926 times