X11 Forwarding with an Already Running Window – How to Guide

It's possible to have this if you launch a second X11 server in a "single window" mode. (In other words, exactly like you're doing it on Windows.) Use Xephyr or Xnest for this:

Xephyr :42 &
DISPLAY=:42 ssh -Y host

The X11 server determines how windows are displayed: you can run X11 fullscreen, you can contain the entire X11 screen within a single window of an already-running GUI, you can make X11 windows integrate to the already-running GUI. XWin and Xming have all three modes, while Linux has Xorg, Xephyr/Xnest and things like Xpra for each mode.

On Windows, the default GUI is only accessible through Windows API, so a X11 server needs to be started separately – in this case, you're starting Xming, in a "single window" mode.

On Linux, X11 is already running full-screen and ssh just connects to it. If you want to contain some programs to a single window, you also need to start a X11 server in a "single window" mode – only instead of Xming they're called Xephyr or Xnest.

Almost there Oracle Linux 7.x I had to go into vi /etc/ssh/sshd_config

Find the lines for X11 and make sure they were active or set

X11Forwarding yes

X11DisplayOffset 10

X11UseLocalhost yes

re-ran putty as oracle and ran the runInstaller... and it worked