I have recently set up a small network for a friend of mine with an ADSL internet connection. I have installed Analogue X proxy to enable other computers on the internal network access to the ADSL link. These computers all point to the proxy for external access. I am using WinXP Pro.

How can I allow access to one of the internal computers from an external computer with this setup?

I am very green with firewalls and proxys and I have been reading as much on the net as I can get my hands on about these. Unfortunately no one seems to have raised my specific situation. So I am.

Can anyone help me??