The Magento System is in "web/shop". How do I set a session variable outside of it (e.g. in "web/index.php")? And how do I read it inside of Magento (e.g. in "web/shop/app/...")?
The scenario is the following: A user visits a landing page (e.g. "web/lp/example.php"). Dependent on the landing page, certain contents in "web/shop" must be customized only for that session. So a session variable must be set in "web/lp/example.php" to be read later in the shop.
Thanks for your help!