I did this at home a few days ago, I am on a modem now. I did connect to one machine from here using dialup and this command from my local terminal

xinit -e ssh -X mydomain.com -- :1


On a modem it's too slow, however on a fast network it works quite well. At home I did this with three machines

in a terminal I run this...
xinit -e ssh -X www.mydomain.com -- :1 &
xinit -e ssh -X firedragon.mydomain.com -- :2 &
xinit -e ssh -X slacker.mydomain.com -- :3 &

so then I can access the local machine at ctrl_alt_F7, www at ctrl_alt_F8, firedragon at ctrl_alt_F9, and slacker at ctr_alt_F10