read the following file can know more about the route and flow

store/app/code/core/Mage/Core/Controller/Varien/Front.php <== front controller store/app/code/core/Mage/Core/Model/App.php <== (Main) App Model (Object) about REFERENCE : 即係跳 block 專用技
Diagram 3

is used to make reference to another block. By making a reference to another block, the updates inside will apply to the it correlates to (see diagram 3).

In order to make the reference, you must target the reference to a block by using the ‘name’ attribute. This attribute targets the tag’s ‘name’ attribute. So if you were to make a reference by , you’re targeting the block called .