What is this skinnable interface I have heard about?

With Dark Age of Camelot: Trials of Atlantis, we have introduced a redesigned interface. The interface will include features such as resizable windows, scroll bars, and will be skinnable. There will be four new skins with Trials of Atlantis as well as the existing Classic interface and Shrouded Isles skins. In addition, you will be able to design your own customized skins. Detailed, step by step documentation is located [here].

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