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GPE simple help

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Call external help browser.

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<para>
Simple interface to provide a call for an external application 
to display help information. Currently this is fixed to a list
of HTML browsers.
</para>

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<para>

</para>

<!-- ##### FUNCTION gpe_show_help ##### -->
<para>
This function creates a filename and topic information from
supplied parameters and calls an external application to display
it. The filename is created from the 'book' parameter, the 'topic'
parameter is passed as index for the help file.
The resulting URL that is opened is constructed in this way:
file://usr/share/doc/gpe/&lt;book&gt;.html#&lt;topic&gt;
</para>

@book: String describing help book file.
@topic: String describing help topic.
@Returns: TRUE if an error occured, FALSE otherwise.


