ubuntu : 在本地的X-Window 看遠端的X-Window程式

本端機器：
   1. ~$ sudo vi /etc/X11/xinit/xserverrc:
      Remove the "-nolisten tcp"
   2. ~$ sudo vi /etc/gdm/gdm.schemas:
      Comment out the "DisallowTCP=true" so that it doesn't add the -nolisten back.
   3. Really restart X
      The easiest way is to probably kill gdm and then restart it from a text login:
      ~$ sudo service gdm stop
      At a text login:
      ~$ sudo service gdm start
   4. ~$ xhost +
   5. ~$ ifconfig 查詢目前IP address

遠端機器：
   1.  export DISPLAY=本端機器IP address:0.0
   2. ~$ xclock