JJ wrote:
I do a similar thing, just bridge the two connections, and the run winmx on the gateway machine and use realvnc to control it
I would recommend using the built-in Remote Desktop to control Windows XP unless you have an OS other than Windows (such as AmigaOS or Linux) that needs to control it since it's much faster that RealVNC. Just right-click on "My Computer", select properties, go to the Remote tab and check "Allow users to connect remotely to this computer". There are Remote Desktop clients for all Windows versions on the Windows XP CD. It's already installed in XP under Start Menu / All Programs / Accessories / Communications / Remote Desktop Connection.
If you're worried about security, just add a rule to the firewall to allow only local addresses to connect to port 3389.