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The process of forwarding X11 through a port involves the following steps:

1. Establish an SSH connection: Use SSH to establish a secure connection to the remote system where the X11 application is running.

2. Enable X11 forwarding: Use the -X or -Y option with the ssh command to enable X11 forwarding. The -X option sets up X11 forwarding over a secure connection, while the -Y option enables trusted X11 forwarding.

3. Set the display environment variable: Set the DISPLAY environment variable to the IP address and port number of the local system. This variable tells the X11 client where to display the X11 application.

4. Start the X11 application: Start the X11 application on the remote system.

5. Verify X11 forwarding: Verify that X11 forwarding is working correctly by launching an X11 application on the remote system and checking that it displays on the local system.

By following these steps, users can forward X11 through a port in a secure and reliable manner.