X servers

This page contains information on software specific to X Window Servers, also known as X11.

Windows 7/8/10

Run the X server before establishing an ssh tunnel, it will auto-detect the correct port.
Terminology: There is no "X client software", the GUI application is the X client, and the X server generates the visuals.
https://unix.stackexchange.com/questions/12755/how-to-forward-x-over-ssh-to-run-graphics-applications-remotely