Re-implementing a new controller interface

[eluser]kakawett[/eluser]
Hi there,

I'd like to know how to make a new controller, inherited from the codeigniter's core Controller one.
So that I could start my controllers like this:

class mycontroller extends InheritedController {...}

and use extra functions and variables I'd have defined in the InheritedController class which use the Controller one as a parent.