Use VNC Without Router

Warren Melhado wmelhado "at"
Sat Nov 12 21:39:01 2005

I have several RealVNC sites up and running, all using Linksys routers.  I
would like to remotely help my brother-in-law solve a problem he is having
and need to install the RealVNC server on his system.  He is on a broadband
connection, but does not have a router.  Is it posssible to use this system
and, if so, how do I open Port 5900?