GenCase: what is and does 'border' do within 'modefill'?

On page 50 of the XML guide, I am having hard time parsing this explanation and understanding what border does.

<modefill> indicates what type of points can be filled

with void, fluid, bound, it fills with that type of points

inside the specified limits or the presence of a given

type of point using border

In the XML file there is no other relevant reference to the keyword border as ctrl+F goes.

The examples on the same page show that the field modefill can take up to 4 valid values: it is clear that fluid, bound and void are all types of particles.

In one application, when I enable border instead of void, I could not spot any difference in the particle layout.

What is border and how does it work? Thanks for clarifying this.

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#7 /var/www/forums-dual-sphysics-org/index.php(29): Gdn_Dispatcher->dispatch()
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Notice
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

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#3 /var/www/forums-dual-sphysics-org/library/core/class.format.php(1479): Gdn_Format::rich('[{"insert":"On ...')
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Notice
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
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