//This is in the plugin with the API

        public Object run(Object[] os) {
            String mode = (String)os[0];
            if (mode.equalsIgnoreCase("GET_NAME")) {
                String id = (String)os[1];
                npc npc1 = npc.getNPC(id);
                if (npc1 != null) {
                    return npc1.getName();
                }
            }
            return null;
        }


//and this is in the plugin calling the custom hook

        public boolean onCommand(Player player, String[] split) {
            if (split[0].equalsIgnoreCase("/ntest") && player.canUseCommand(split[0])){
                String Ename = (String)etc.getLoader().callCustomHook("NPCAPI", new Object[] {"GET_NAME", split[1]});
                if (Ename != null){
                    player.sendMessage("Exists!");
                    return true;
                }
            }
            return false;
        }


//throws ClassCastException