>When installing the software on a computer (with OS Windows 98), it happened that the
>online did not work, although it does work when testing the installation on my development
>machine.
>
>I suppose I need to distribute some merge modules with installshield express, but I could
>not find out which ones I need to include for CHM help to work.

Assuming you're using VFP7, you need to include FoxHHelp7.exe and FoxHHelpPS7.dll. Check out MSKB#Q314296 for more information.