Say if you wanted to help someone on you'r network who has been having probs, you don't want to use Remote Desktop because they want to know how to fix it on their own next time it happens and you don't want to use Remote Assistaince because you don't want to accept loads of things about Allowing the remote computer to move the mouse and wether or not they are allowed to connect and you don't want to set them up neither so the simplest way is using VNC. all you have to do is install it and set a password (and maybe allow it through the firewall) but that is it. It has it's own built in Java Viewer for using Internet Explorer or Firefox where as with Remote Desktop you need to install IIS and then you need to install Remote Desktop Web Connection thingy. VNC is the Easiest. I use RealVNC