What is a "General Window"

[powerwindows]

I submitted a skin for the first time since last fall, and it was rejected as I was missing some windows. I read the FAQ, and it reads:

"Do not publish incomplete skins; every skin should at least have the Main, Equalizer, Play List, Video and General windows skinned."

I knew I didn't have a Video skin, and can easily fix that, but I'm stumped on what the "General window" is???????