When changes are made to more than one of a collection’s items using "setData('some', 'value')", which of the following methods will save the changes in the collection?

What is a Composite Product?

Which code snippet is used to show ALL products in your catalog on your front page?

You need to change an username permission access. How do you change it?

A custom frontend controller will extend which one of the following classes?

Inside a .phtml file, what does '$this' refer to?

Which xpath is correct for replacing Mage_Customer_Model_Address via Mage::helper ('customer/address')?

Which characters are NOT valid for the 'Attribute Code' property when you add a new attribute for a product?

Which field is used to identify countries from which you accept the orders?

Which validation checks for the data entered in a field are available?

Which tools/customizations are available in Magento?