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For documentation on the legacy kernel, please go to doc.ez.no where you'll find documentation on everything from it's its GUIs, official extensions to template coding ( 5.x doc: User manual & Technical manual ). If you are looking for documentation on how to develop extensions for legacy in php, then also see relevant material on share.ez.no ( Tutorials, Blogs ).
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For documentation on Symfony2 go to symfony.com (for Twig see here) and for the Exponential parts of 5.x kernel continue reading in this section of our new wiki documentation area.