https://www.realvnc.com/products/open/4.0/man/vncserver.html
https://www.realvnc.com/products/open/4.0/man/Xvnc.html
-localhost Only allow connections from the same machine. Useful if you use SSH and want to stop non-SSH connections from any other hosts. See the guide to using VNC with SSH on the web site.
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