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

Public Sub HTMLHelpContents()
  ' Force the Help window to display
  ' the Contents file (*.hhc) in the left pane
  htmlhelp hwnd, SetHTMLHelpStrings(), HH_DISPLAY_TOC, 0

End Sub