anchor.diff:  %% set_pid_for_id(ID,Pid) ->
   %%    tts_data:user_update_pid(ID,Pid). 
   
  -%% delete_session(ID) ->
  -%%     tts_data:user_delete(ID),
  -%%     ok.
  +delete_user_pid(Pid) ->
  +    tts_data:user_delete_pid(Pid),
  +    ok.
  
positive.code: handle_call({create,User}, _From, State) ->
      Result = create_new_user(User),
      {reply, Result, State};
  handle_call(_Request, _From, State) ->
  	{reply, ignored, State}.
  
  
negative.code: -export([start_link/0]).
  
  -export([get_user/2]).
  -export([remove_user_by_pid/1]).
  
  %% gen_server.
  -export([init/1]).
  