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Everything else is ultimately simply details -- important details, but variants on that theme. index.php is the controller, the menu system determins what the "present page" is, and lots of occasions get fired in the act of building that page. Plugin modules can hook into those occasions and adjust the work flow/provide additional tips/etc. That is also a part of the reason so many Drupal resources center on making modules. Without modules, Drupal does not actually DO anything other than say, 'Someone asked to get a page! Does it exist? No? OK, I'll serve up a 404.'
<a href="http://billysrereebiz.com">Corro</a>
http://billysrereebiz.com - lolz
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