When using X-Window System from a remote system, for example, to access the Configuration Tool, you must set up the DISPLAY environment variable to allow the application to display its windows on that system.
xhost +appl
where appl is
the network name of the system being used to run the application.export DISPLAY=disp:0.0
where disp is
the host name or IP address of the system where the windows will be displayed
(followed by a colon and the display id—normally 0.0). The application windows
are then displayed on the disp system.