Displaying X windows applications on a Windows desktop
Setting the X11 display to show X applications under Win2k
Start up X-Win32 / Xming and an XDMCP session. Make sure the server you are going to run the application from has permissions in the X-server (for Xming it's in the X0.hosts file)
Putty into the machine you're running stuff off:
export DISPLAY=YOUR IP:0
run the program :)
Make sure the machine with the program on it (eg. /usr/games/tuxeyes) has xdm installed, and has open ports on the firewall (eg /etc/shorewall/rules:
ACCEPT fw loc tcp x11
ACCEPT fw loc udp x11