I need to create a help file for an application that I am writing, and I have some basic questions on this.

I know I can write the help file in MS Word, save the documents, and then just load them when the user clicks
on the Help menu item. However, I was wondering if there is an application that would allow me to write
help files that look like, well, standard help (for lack of a better term). Like for instance - when I click
on help in VB 6.0, I get the MSDN help screen. Is there an application that I can use to author help files to look
like this? If so, where can I get a copy (downloadable)?