🚀 go-pugleaf

Since there isn't a native support for .chm files in BCB6, I did some search 
in google groups about doing it and finally I ended with a piece of code 
like this:

bool TForm1::DisplayHelp(void)  {
    AnsiString HelpFile = "a.chm";

    RunProgram(HelpFile, "");
}
//--------------------------------------------------------------------------

bool TForm1::RunProgram(AnsiString Name, AnsiString Parameters)  {
    SHELLEXECUTEINFO execinfo ;

    memset (&execinfo, 0, sizeof (execinfo)) ;
    execinfo.cbSize = sizeof (execinfo) ;
    execinfo.lpVerb = "open" ;
    execinfo.lpFile = Name.c_str () ;
    execinfo.lpParameters = Parameters.c_str () ;
    execinfo.fMask = SEE_MASK_NOCLOSEPROCESS ;
    execinfo.nShow = SW_SHOWDEFAULT ;

    ShellExecuteEx(&execinfo);
}
//--------------------------------------------------------------------------

That's okay, it displays the .chm file but I'd like to do two things more, 
which I didn't figure how to do:

1) Since the .chm file is organized in pages (chapters maybe, not sure what 
the word is), I'd like to be able to programatically open it at a specific 
page (say, "Welcome").
With .hlp files I used HelpJump to do that but I can't do it with .chm 
files.
So how do I do it?

2) How to make sure only one instance of this .chm file is actually run?
Writing to the registry comes in mind, but is there a more clever way to do 
it?

Thank you,
Analian