helpOnFileEx() function arguments?

I have a .chm help file which I want to invoke on button press in the dialogbox.
I tried to use function helpOnFileEx() but the arguments are unknown.

Can anyone provide an example of invoking the function helpOnFileEx()?

Below is the code i tried:

Re: helpOnFileEx() function arguments?
llandale - Fri Dec 07 12:44:11 EST 2012

Don't know.
below are all the calls in the doors.exe and the two references in the help. I notice:

• indices 0-5 are reserved
• file is type *.hlp

void        helpOnEx(DB,string,string,Locale)   DOORSHelpLocaleOn 
void            helpOnEx(DB,string,string)              DOORSHelpOn
void            helpOnEx(DB,string,int)                 HelpFromFileEx
void            helpOnEx(DB,int)                        HelpIntOnEx
void            helpOnEx(DB,string)                     HelpOnEx
void            helpOn(DB,string,int)                   HelpFromFile
void            helpOn(DB,int)                          HelpIntOn
void            helpOn(DB,string)                       HelpOn
void            gluedHelp(DB,int)                       GluedHelpIntKey
void            gluedHelp(DB,string)                    GluedHelpKey
void            help(DB,string,string)                  DOORSHelpContextID
void            help(DB,string,int)                     HelpFileKey
void            help(DB,int)                            HelpIntKey
void            help(DB,string)                         HelpKey

helpOn Declaration void helpOn(DB box, string helpFile, int index)
Operation
These functions are used in callbacks to activate the help system on a given topic. If the optional second argument is used, the help file must be in the appropriate format for the platform and must be referenced by a full path name; a relative path does not work in this case.

Example
void explainData(DBE key) {
helpOn(getParent key, "DATA.HLP", 1)
} // explainData
button(dataBox, "Explain", explainData)

helpOnEx Declaration helpOnEx()
Operation
Invokes Rational DOORS help on the given topic, using chm (html) help file format. Arguments are the same as for existing perm helpOn(). Indices 0 - 5 are reserved for DOORS internal usage.

-Louie