To work with a connector, you have to specify the Login and Password. Login and Password are provided by the broker. To get the API access it is recommended to contact the broker.
ITCH - direct data-feed protocol, which allows to connect via TCP and UDP protocols. ITCH provide the order log to track all changes to any order. This protocol is used by the NASDAQ (see TotalView-ITCH ) and LSE (see MITCH ).