X Server listening on loopback

Hello everyone, I modified the following file: /etc/opt/kde3/share/config/kdm/Xservers so that my X server won't listen to tcp connetions. I added the "-nolisten tcp" to the main line there. I restarted the X Server and when I use netstat I don' t longer see any line listening on port 6000. Before I had: 0.0.0.0:6000 After the change I was expecting to see: 127.0.0.1:6000 The problem is I don't see anything now. How come? I thought that the "-nolisten tcp" argument meant that X should listen only on the loopback device. Isn't X client-server model? Or does it use IPC ? Thanks in advance, Jorge