Question about super class

[eluser]shinokada[/eluser]
In the system/libraries/Controller.php, it says the following.

/* CodeIgniter Application Controller Class
*
* This class object is the super class that every library in
* CodeIgniter will be assigned to.

Q1. Does it mean I don't need to load it, if a class is super class?
Q2. If I extend Controller in applications/libraries/MY_Controller.php, will it be automatically loaded?


Thanks in advance.