http://thomer.com/howtos/nstx.html
(http://skidzilla.googlepages.com/diagram_linux-nstxd.jpg)
As in running both the nstx client and server, with the proxy server running on a Linux virtual machine (http://www.cl.cam.ac.uk/Research/SRG/netos/xen/)
on the same computer? Or am I just being a bit thick?
(Edit: spent 10mins in inkscape and made a diagram :P)