Many times there will be a requirement of using GUI in putty. It might not be possible to install a vnc in some production environments, so it becomes necessary to have a way in which one can get GUI in putty.
For this one has to ENABLE X11 FORWARDING in putty.
To do this the steps are as follows.
1. Install Xming-6-9-0-31-setup.exe
2. Then enable x11 forwarding in putty as shown in the screenshot.
3. From the command prompt make a 'xhost+'
4. Make a xclock and there you are - you can see the display.
5. Please keep in mind that there may be a couple of things that may be missing if you fail to have gui. Check that xauth is installed in linux. In the eventlog of the putty session a message will come saying that x11 forwarding failed because xauth not available. Search rpm with name *xauth* and then install that rpm. Also if xclock is not coming up, one needs to install rpm corresponding to xclock.