FIX Dictionary 4.0 is a very intuitive and easy to use interface for the FIX 4.0 protocol specification that is used in financial software. The application displays all the fields in the protocol description sorted by tag number, tag name and listed by the message type. By clicking on any field in the application you get a view describing details like the tag number, tag name, data type, message types that the field belongs to, and the enums that the field represents.