[REQUEST] ANYONE HAVE DETAILS ON 'SPRITE' OR 'WINDOW' RMXP CLASSES?

When I mean details on 'Sprite' and 'Window', I'm asking if anyone has any abstract or concrete code for either base classes?

Here's the examples:

RMXP script (Window_Base)
class Window_Base < Window
...

RMXP script (Sprite_Picture)
class Sprite_Picture < Sprite
...

RMXP script (Sprite_Character)
class Sprite_Character < RPG::Sprite
...

I have no idea what the Window, Sprite, and RPG::Sprite class details are, so I have no idea what their base methods/calls are. Without that detail, I'm a little in the dark.
As far as Sprite and RPG::Sprite go, I'm not sure if they're the same class, because 1 is displaying a specific namesapce, while the other isn't.

As far as I can tell, those are the only parent classes that are not visible to the user through the Script Editor within RMXP.

I'm trying to re-write the existing engine with a new design patterns to allow for more programming flexibility, including adjustable window/viewport resolution changes.

If anyone has any leads, or having the same problems as I, please post a reply.