Why is an ArrayList send down the socket and
not a Set as retrieved from myMap.keySet()?

If Game is refactored to use a commandfactory similar
to what's done in Client, 

   where should the CommandFactory class be (package?)

   getCommand returns a Command that's pretty client specific,
   how can it return something useful to the appropriate requester,
   e.g., GameCommand or ClientCommand 

      hint: Change the Command interface to take an Object parameter
      create two subclasses using template-pattern/hook method with
      something like this in the Command class.
   

         void execute(Object o)
         {
             hook((CastMePlease) o);
         }