To accomplish some tasks the universe relies on messages. The API provides methods to receive and post messages. You can also define a custom message type which extends the standard collection of Alias messages. Although Alias has no understanding of the new message type (because Alias cannot receive messages from plug-ins or OpenModel applications), plug-ins can use them as communication channels. This allows for interesting possibilities, such as a group of plug-ins collaborating on a function. See the documentation on the AlMessage class for more information.