You might want to look here for some solutions:
http://wiki.linuxquestions.org/wiki/...top_Connection
Enabling xdmcp on your target linux box will allow you to connect from any other system with an X server. From another Linux box, you would <CTRL><ALT><F1> into a terminal session, and invoke:
X :1 -query <your.target.ip.address>
From a MSWin box, you need to install an X server such as Cygwin/X, then launch a bash session and invoke:
xwin -query <your.target.ip.address>
VNC is also an option to consider.