A world of message-oriented programming languages (2018)

Like the structure, the individual elements may be of different types and sizes, but they are referenced like an array—an index into its position within the tuple. On X Windows, you call one of two functions—one just takes a large number of paramters, the other one takes a large number of paramters, one of which is a rather lengthy structure. And all of the examples I’ve seen of message passing is just passing along data, usually structured as a structure (sorry) or a tuple (depending upon language).

Source: boston.conman.org