Context Number Map

I am trying to figure out how to go about using context number maps for use in some help pages that I am creating. I have made the .chm file, and have figured out how to access the context number map. However, I cannot figure out how I am supposed to tie these numbers into my application.

I can get context based help by utilizing the Help.ShowHelp and then turning to the HelpNavigator, but none of the various members within HelpNavigator seem to use the context number map. Any idea how to use said number maps, or should I just stick with using HelpNavigator.KeywordIndex?

Thanks,
Garret