Install the VNC server if it's not already installed:
Start the VNC server on screen 1
If you leave off the screen number it will automaticly assign the next available screen.
Now start the TightVNC client on Windows and connect to myVNCserver:1
To kill the VNC server:
You'll want to use Gnome instead of twm:
edit .vnc/xstartup and make these changes at the end:
#twm &
/usr/bin/gnome-session &
You'll need to open the firewall on your server for VNC
To start the server with different geometry or color depth: