Linking a HTML help file to a Delphi 4 program

Hi,

I have created a .chm file using HTML Help Workshop and I would like to open it from my program written using Delphi 4 Pro.  What code do I need to do this (and what do I need to add to the uses clause to access the required function)?  Basically, there are 2 things that I need to be able to do...

1) Open up the help file with the default file being displayed (for when the user chooses Help Topics from the Help menu).

2) Open up the help file with a specified file being displayed (to display help for a specific dialog box when the user presses the Help button).

Thanks in Advance,

Richard