You have a remote machine that has an X11-based program that you want to open in Windows.
Follow these steps to get it to work:
# A bunch of status will print to stdout. XWin -multiwindow & # This is case sensitive. export DISPLAY=:0.0 # You should see something like "debug1: Requesting X11 forwarding with authentication spoofing." ssh -Yv myhost
Try a simple program to test it. I like to use xterm.