For this example we will useing the names home & remote for our servers. Home is the starting sever and remote is the server your logging into and displaying the app back to the home server.
rich@home# ssh -X remote
Can also use -Y instead of -X. This is more secure then the method described below. Some work places don't allow X forwarding so you have to use the DISPLAY variable.
rich@home# xhost + remote
server2 being added to access control list
rich@home# echo $DISPLAY
:1.0
rich@home# ssh remote
rich@remote# export DISPLAY=home:1.0
At this point you can now forward your display. Export DISPLAY works with BASH and KSH. Use setenv DISPLAY for CSH. Take a note of the fact that this 2nd way of forwarding your display is insecure. Reference
How to export display from Linux to FreeBSD
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