Window type in HTML Help Workshop

Hiya,
Can anyone offer a brief explanation of window types in HTML Help workshop? Their documentation is awful - they need a help on help.
Are windows types necessary, or is it possible to customize the default window, which is the Help Viewer?
And why does the table of contents window float? It has a blank (title) bar on top of the TOC, and when you click it and drag, the entire TOC window floats around. What properties need to get set to change this? All those checkboxes on the Extended and Styles tab have no explanations in the help.

Thanks,
Sarah