Controller in Simple Search in Toolbox tutorial

Hi,
I am very new to OA framework.I have just begun by learning from Toolbox tutorial provided in Jdeveloper 9i(I am working in 11.5.10.2).In Create search(simple search) we define Application Module,EO and VO(and other things like Associations).I am not able to understand how does AM gets called when we have not defined the controller.To put it as an example if I am giving 'B%' in empname field and then press "Go" button then how does AM get called?Does the system generate controller for this page on its own? I would be grateful if you can clarify it.
Regards

As per dev guide
Many new OA Framework developers wonder just "how big" a controller should be. Should you have one per page, one per meaningful region (like a "Search" region), one per complex web bean (like a table) -- or what? Unfortunately, the answer is it depends.
First and foremost, in a really simple page, you might not have any controllers (there is no requirement that you create controllers if they have no work to do). If you do need to write code, you should weigh the following carefully before deciding what controllers to create:
the benefits of encapsulation -- ideally, a web bean implements its own behavior
component reuse -- if a component is designed to be shared, it must be self-sufficient> practical code usability -- although a page comprised of eight regions could easily have eight corresponding controllers (each with a few, trivial lines of code), this > "pure" object oriented approach can make code maintenance more difficult, and it can cause unnecessary file bloat in your product
Thanks
--Anil                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

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