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Configuring PuTTY for X11 Tunneling

1.  Start PuTTY and you should see the config screen
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2. Expand the SSH section of the left menu and select X11
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3. Check off Enable X11 forwarding
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4. Click back to Session in the left menu and click on Default Settings then Save
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5. Type in the host name you want to connect to
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6. Optionally fill in the "Saved Settings" box and then click save to save it in the list to connect to later
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7. Now click Open, if you get a message about the host key, press Yes (there are times you may not want to press yes, but that is beyond the scope of this document)
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8. Login to the system and type "echo $DISPLAY" to verify your tunneling is enabled.   You should see something like localhost:20.0, the imporant part is the localhost and the number after the 20, it should be anything except 0.   If DISPLAY returns nothing, you've done something wrong, start again.
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9. You may now run any command that will display back to your system, try xterm to begin with.