General

You can use TELNET or any other socket client to connect and control your Media Center. To see all available commands type "help" in your console.

Details

The network server runs on port 40500. this is the default port for the local Media Center. Every Extender is connected by adding the extender user numeration to the default port.

Every extender creates a unique user account on your Media Center machine. e.g. Mcx1-MachineName. For this extender the port will be 40501.
You can take a look at C:\Users to see which extender users are available.