Friends ,

From windows machine it is possible to enter a Linux Machine from a Windows machine using SSH . But using SSH , we can use the text editor , don't get the X window .

Now my question is , is it possible to enter the Linux graphical mode using SSH ?

Thx...

I heard it;s possible but I was never able to do it.

Short answer is no. Long answer is yes, you can forward X connections over SSH but you don't get a full desktop environment or anything like that, just single apps and you need to be running a X server on the local computer as well.

Best suggestion is FreeNX to use a GUI over a network.

The most common way would be to use VNC. Install a vnc server on the Linux machine, see: http://wiki.linuxquestions.org/wiki/VNC#Mandriva

Once you've got that setup you can ssh into the machine using putty to tunntel VNC over ssh like this: http://martybugs.net/smoothwall/puttyvnc.cgi

Where 5900 is the port that VNC runs on on your Linux machine. You can now connect to it using a VNC viewer on the Windows machine with the address localhost:0, since you've tunnelled VNC over ssh. Note that VNC can support multiple desktops and it may actually be on desktop 1, ie port 5901.

The way i did this was to install cygwin on my windows machine.... install the xwindows port to cygwin. Then used ssh from cygwin using -X option for x11 forwarding.

Its a bit cumbersome to setup, but once i got it working it was sweet.

OK I have dealed with this and I have a clean answer.
VNC is used to get a whole desktop on the network. That means you start a new X server (VNC server). Now if you do that a few times your RAM will be exhausted. In my occasion this is what i wanted so it doesn't matter.
However it is possible to start graphical applications through an SSH connection. All you have to do is enable X11 forwarding:
uncomment/edit the line
ForwardX11 yes
in /etc/ssh/ssh_config
From the client side you need an implementation of X which exists in almost every modern UNIX variant.
If you are on a Windows machine there are many X implementations for MS Windows AFAIK and some of them are freeware so you wan't have to pay for it. I guess Cygwin does the trick too but as you said it's a bit cumbersome!

PS: You should start ssh like that ssh -X [options]

This is also terribly slower and less robust than the other methods (VNC).

You can try Xming. It's basically a modified cygwin/xserver that lets you tunnel x over ssh.