Universal Messaging Event Dictionaries (nEventProperties) provide an accessible and flexible way to store any number of message properties for delivery within an event (for related information, see Events).

Event Dictionaries are quite similar to a hash table, supporting primitive types, arrays, and nested dictionaries.

Universal Messaging filtering allows subscribers to receive only specific subsets of a channel's events by applying the server's advanced filtering capabilities to the contents of each event's dictionary.

Event dictionaries can facilitate the automated purging of data from channels through the use of Publish Keys.