When using a HTML help file, you will obviously want to be able to display certain pages or sections. This code shows you how to display the index panel.

Public Function SetHTMLHelpStrings() As String
    '// this presumes the help file is in the same directory as your app, and Main is the name of the window
    SetHTMLHelpStrings = App.Path & "TestHTMLHelp.chm" & ">Main" 
End Function

To display the index, use this code  (from a form, otherwise you will need to change the hwnd value that is passed):

Public Sub HTMLHelpIndex()

  ' Force the Help window to display the Index file
  ' (*.hhk) in the left pane
  htmlhelp hwnd, SetHTMLHelpStrings(), HH_DISPLAY_INDEX, 0

End Sub