How to convert my pre-XE html help to the native form?

Under the Embarcadero hack in Delphi 2000, I nullified the call to windows help, by the assignment:
Application.Onhelp := FormHelp; - with an associated function.

Actually my calls to help were in this form
  _HHwinMain := HtmlHelp(application.handle, PChar(Help_File + '>MainView'), HH_DISPLAY_INDEX, 0); - or something similar.

I now can't get it to work, and would like to implement the native htmlHelp calls.

How do you do this?
GrahamDLovellAsked:
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GrahamDLovellAuthor Commented:
Prior to making htmlhelp native, Embarcadero instructed users to include the following global function:
function HtmlHelp(hwndCaller: HWND;
  pszFile: PChar; uCommand: UINT;
  dwData: DWORD): HWND; stdcall;
  external 'HHCTRL.OCX' name 'HtmlHelpA';

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This has to be removed when including the unit HTMLHELPViewer in the main uses clause, as does the assignment Application.OnHelp := HH; and the associated HH function.

As before, create your help file in HTMLHelp Workshop (free from Microsoft at http://www.microsoft.com/en-au/download/details.aspx?id=21138)

The steps to incorporate help in VCL are simply:
1. Put HTMLHelpViewer in the main form's uses clause.
2. Assign the helpfile filename (full path) to Application.helpfile. Do this in createform.
3. To display the Table of Contents, make the call: HtmlHelp(0, Application.HelpFile, HH_DISPLAY_TOC, 0);
4. As before, to call help from a button, make the button "kind" bkHelp, and assign the topic number to HelpContext.
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