An API module that contains a conceptual set of facilities.

A request from a client for the current state of all data on a topic. A client can fetch a topic's state without being subscribed to the topic. This request-response mechanism of getting data from a topic is separate from the pub-sub mechanism.

A mechanism within a Diffusion™ client that limits the rate that client sends messages as the load level from that client increases. A client application rapidly making thousands of calls to the Diffusion server might overflow the internal queues, which results in the client session being closed. Flow control protects against these queues overflowing by progressively delaying messages from the client to the Diffusion server .

A section of content that contains data of a specific type. Fields are nested inside records. A record can contain one or many fields.