connecting virtual UBUNTU server from win32 machine

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http://askubuntu.com – I am new to Linux command line, just familiar with Linux desktop environment not command line. My problem is Our client in different country provided us a VPN connection which we connect through Sonicwall net-extender. I am using windows xp 32 bit. After that i use putty to connect to the client's linux server (ubuntu) through ssh who have a static local IP 192.168.x.x and i get connected to linux command line interface. Then i install tightVNC server from command line to ubuntu and run it, then i use tightvnc viewer for windows to connect to unbuntu desktop (gnome) and i get connected. The (HowTos)