Question about require and loader:true

Hello,

Im a very new newbie to MVC. I have a question about the setconfig and loader:true.

Will the Ext.loader find all my classes providing Ive got my classes in the correct folders. Or am I required to name all my required classes. I know that's not the way to do it, that I should note all my required classes. But Im an extremely lazy typist . And after I pick up on this will start "Ext.requiring" the classes ...