Get controller and method called inside the super controller

[eluser]Unknown[/eluser]
Hello,
i want to check some stuff into the Super Controller Library and redirect if one condition is ok.

So, when the first redirection is done towards a specific (let's say signup page), i want to avoid infinite loop.
So i want to check if the signup controller has been called and so avoid to reredirect.

How could i get this information?

Thanks a lot.