Actually I pretty new with this remote desktop thing, that's why maybe sometime my questions are not logical. I can't understand the whole thing yet. So, sorry for that.
Whatever, end point is that, Is possible to connect to remote computer using dynamic IP over the Internet, by using software Remmina or Vinagre and Vino? If so, then is there any simple step by step guide for this? I need a free but GUI based solution.