corrected switch case typo
empty else removed
stopQuiz(int) and isQuizActive(int) are only methods to have
synchronized. (The methods in the server classes are synchronized as
well). I'm not confident about the use of synchronized yet. 
Editted Javadocs from older version of quiz.
answerQuestions(int) made private in QuizControllerImpl, so removed from
QuizController.
The very simple bug was debugged by Joe Watkins. In QuizLauncher, we
tried changing Server server = new Server() into Service server = new
Server(), thereby binding the interface, not the object, to the
registry. (Although the former worked in PiJ ex1 'Echo'..?). Joe also
showed me how to get the security policy in using the IDE and told me
that the rmic is not needed). Finally, Joe recommended creating the
different packages and moving the classes and interfaces into these. Joe
is Legend.
pushing up (this time with correct password!)