I had the same trouble. I solve it creating a header file like this:

#define Start 0
#define Introduction 1
#define Draw 2
#define Execute 3

Then, in HTML Help Project's [ALIAS] section, add the following alias:
Start=Start.htm
Introduction=Introduction.htm
Draw=DrawPictures.htm
Execute=ExecutingComparison.htm

I don't put [ALIAS] and [MAP] section in one file. Maybe that's the difference.
If you want to show HTML Help clicking on a button, you can call HH.exe via Shell function (or its Access equivalent) passing the .chm file like parameter. It's something like this:
Shell "hh.exe YourHTMLHelp.chm"
A question: Do you use F1 key or only click on a button?


glurrea