3.8.3.11 -X and -x: control X11 forwarding
The -X option turns on X11 forwarding in SSH, and -x turns it off. These options are only meaningful if you are using SSH.
For information on X11 forwarding, see section 3.4.
These options are equivalent to the X11 forwarding checkbox in the X11 panel of the PuTTY configuration box (see section 4.25).
These options are not available in the file transfer tools PSCP and PSFTP.