Ctrl-t

I happened to stumble across something today, I was in Spark and hit CTRL+T and got a window called Frequent contacts; has anyone else seen this, and is there any documentation on it.

I can see how it would be useful if I could undock it from the Spark Roster, and leave just that window up, does anyone know if any of this is possible?

Hidden Features

No, there is no option to make these windows dockable.