Yellowjkt, they are talking about how the terrain editor works.
The terrain editor is a seperate utility from the game that allows players to create their own terrains. So you could build a Pearl Harbor terrain, or a Battle of Britain terrain, or just a generic Europe.
Once you build them, you can use them in H2H sessions, or you can send them to HTC as a submission to be used in the online terrains (we haven't seen the first of these yet).
The rest of what they are discussing are specifics of how the editor works. If you could tell me exactly what you don't understand, I could explain a little more.
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Vermillion
**MOL**, Men of Leisure