Display
 

root@zi-desktop:~# export DISPLAY=192.168.1.2:0.0
root@zi-desktop:~# echo $DISPLAY
192.168.1.2:0.0
root@zi-desktop:~# firefox
Unable to init server: Broadway display type not supported: 192.168.1.2:0.0

Is there a question here?

If so, you probably want to open your own thread with your own question. When you do, provide details, such as what you're trying to do, version/distro of Linux, systems involved, etc. Based on what you posted, there is NOTHING we can tell you, and the thread you posted this in had been closed for SEVENTEEN YEARS.

Assuming an implied question, there's your answer.

Also, don't run FF as root.