Securing windows 7 based kiosk on network

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http://serverfault.com – What steps should be taken to secure a kiosk running windows 7 and a proprietary application on a network? The kiosk requires the ability to make outgoing calls over port 443. I am looking for advice from both sides of the equation. Securing the network, and securing the OS running on the kiosk itself. I assume some balance will have to be achieved between the network owner and the owner of the kiosk hardware in regards to security and kiosk functionality. (HowTos)