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Everything else is ultimately simply details -- important details, but variations on this theme. index.php is the control, the menu program determins what the "current page" is, and a lot of occasions get fired along the way of building that page. Plugin modules can hook in to those occasions and modify the work flow/supply added information/etc. That is also a part of the reason a lot of Drupal resources revolve around making modules. Without modules, Drupal does maybe not actually DO anything other than say, 'Somebody asked for a page! Does it exist? No? OK, I will serve up a 404.'
<a href="http://billysrereebiz.com">Corro</a>
http://billysrereebiz.com - lolz
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