Firewall and xbox360 Windows Media center.

I have two questions overall

  1. I am using the firewall setting “alert me to incoming connections” are my ports still invisble to the entire network or can people see me and if I deny them access it turns invisble to them?
  2. I am using that firewall setting so I can access windows media center on my xbox from my connected pc. Is there a way I can use the firewall setting “black all incoming connections” and still have an active connection from my xbox to my pc so I can play music on it? I need an incoming connection to have the windows media center to work properly on my computer.

Yes to 2)

But you will need to setup manually the Global rules needed to connect to your xbox, which you have now.