Networking X Manually
Whenever possible, you should use the ssh technique already discussed for remote application display because the ssh command performs this task both easily and securely.
If you aren't able to use ssh for some reason and thus can't automate the security policy needs associated with the X Window System's remote display facility, you can use an alternate method—manipulation of the DISPLAY environment variable and xhost security tool—to allow and start remotely displayed applications manually. This can often be the case when you're interacting with older Unix systems in which ssh is not supported or economical.
If you want to run a Linux application on one system and display it on another this way, you must do two things:
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