What is the correct method for injecting a custom block into Magento via layout.xml?

Assuming that trees must have categories as parents and products as children, and that there are no sub-categories under main categories, which code samples will get the full catalog tree?

Which methods will allow access to a Magento session from other sites on different subdomains?

For data security and privacy reasons, Magento uses two cookies for frontend session. All I know is that one of them is being set in Mage_Core_Model_Cookie::set(..) and the other one in Zend_Session::expireSessionCookie(). Why does Magento use the Zend_Session::expireSessionCookie()?

Assuming a left column is going to be added, which are possible values of the block type in the code below?

How can a new column be added in sales_flat_order to save a custom value in Magento?

Which code samples will detect if the account being checked on the front-end is an admin account?

Assuming that product images need to be imported from a product import file, which folder should the images be uploaded to, before running the import profile routine?

Which code sample will display products from a certain category in random order?

Select the correct sequence of methods to use to create a bundle product in Magento.

Assuming that a column needs to be added under Catalog >> Manage Products in Magento, which file will need to be edited?