Export display is quite important for people that work in data center since it is impossible to put every server with a monitor, well actually you can do it with KVM switch, but then you still have to walk to get them. With this way you don’t have to do it, the requirement is only good network connection and strong computer to handle all the GUI 😀
In the case where your server doesn’t have any VGA card, so it’s impossible for you to plug in your monitor and all you can do is to connect by terminal server using COM port, you can try to export your Server’s Desktop into your desktop using export DISPLAY. This also will be useful if you employ a tight security option in your server, for example all of the port in your server is closed but port 22 or 23, then to make a remote desktop connection you can try this option.
Xanadu 