APEX

Hello

I was just wondering if there is a way to enable an application administrator to loggin as another user or to be able to change the username after loggin.

I was thinking about making a small function like this

CREATE OR REPLACE FUNCTION f_get_current_user
   RETURN VARCHAR2
IS
   IF v('NEW_APP_USER') IS NOT NULL
      RETURN v('NEW_APP_USER');
   ELSE
      v('APP_USER');
   END IF;
END;

And every where I'm user the :APP_USER substitution string, I would replace it with my function.

Did anyone ever do something like this?
Is there a better way to do this ?

Thanks
Max