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copied!<p>First of all, I think what's important to understand Drupal's limitations, there are things it's not really made for. It's sort of a web application framework but if you're doing a lot of custom work with your own custom datamodelling and stuff, Drupal might not be the most flexible or easily implementable solution to your kinds of problems. A more general framework like for instance Zend Framework might be more suited.</p> <p>An important lesson in learning Drupal is: don't hack core or other modules. This will make upgrading core or modules very time-consuming. Instead "do like Drupal" and override using hooks. In theming you can also override with hooks, but also in other ways. Overriding is powerful so understand that concept well.</p> <ol> <li>I'd say, pick a way of learning that is your style, screencasts, IRC, hacking, user meetups IRL, books, articles or any combination and look for material on Drupal. Just start mucking around and get a feeling and understanding of how Drupal works. Understanding the jargon is an important part, so what are: nodes, blocks, regions, hooks, modules, themes.</li> <li><p>Drupal has a very flexible permission system, and it's probably the best choice to use that instead of making your own. You can write your own modules that add to or alter the behavior of Drupal. So if you want to write a new application that works with Drupal you can write a module performing the functionality the application has to have and make use of all the facilities Drupal offers, including users, the permission system, etc, etc. I don't really understand the last part of your second question "Is the drupal application it's own drupal instance inside of a drupal website (nested drupals?) ?". Drupal is a collection of PHP files on a server that, together with a slew of tables in a database serves request made to it. Multiple Drupal websites (so different PHP files) can reference the same database or parts of it (for example the user table). There's not really an "instance" of a Drupal site, as there's not really an "application". I could of course be too unfamiliar with these terms but I don't think PHP works with "instances" of "applications".</p></li> <li><p>That's a hard problem, afaik Drupal doesn't work with MS SQL, so any connections in that direction you might have to make yourself. I'd also ask around the Drupal forums or on IRC.</p></li> </ol> <p>Good luck!</p>

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