There are two files provided to help you send HTML help commands to
Navigator 3.0 and later:
  HTMLhelp.c
  HTMLhelp.h

This ReadMe.txt file gives example usage of the call to SendHelpCommand
(provided in HTMLhelp.c) which will send an HTML help AppleEvent to
Navigator 3.0 (or later).

The sample source code included will provide you with the necessary
calls to send an HTML help AppleEvent; all you will need to do is call:
    SendHelpCommand

An example of this call is: 
        err = SendHelpCommand( &myFSSpec, (char *)"MY 1st TOPIC" );

The following parameters will be sent in the AppleEvent:
  * FSSpec for the help project file
  * Topic (c-string) found within help project file

The FSSpec for the help project file needs to be specified.  You should
do this in a way that is consistent with your application (for example,
you might prompt the user with StandardGetFile or you may have it stored
as an alias in a preferences).  Remember, this file is a *project* file
not your every day html file.

Next, you'll want to specify the topic.  The topic is a c-string
(null-terminated).  This string must be in the help project file
(specified in the first parameter) or Navigator will report an error.