He means the VNC ports on your home router. If you connect to a DSL/Cable router then to the DSL modem, you will need to open up the right ports on your home router for VNC access (usually ports 5900-5909 or so).
Also, you install OSXvnc on your Mac at home, this is the the server application. You then install a VNC "client" application to connect to the OSXvnc server app on your Mac at home. There are several VNC clients available for Windows, the one I use is called TightVNC at
http://www.tightvnc.com
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