Abstract: Exemplary methods, apparatuses, and systems that execute a cross-platform application programming interface (API) that supports a plurality of applications are described. The cross-platform API implements a request from an application for a device to participate in a unique conversation, the unique conversation being identified by a topic and independent of a unique identifier for entities. The cross-platform API further provides the application an abstracted discovery mechanism by which the application causes the device to discover an entity that is accessible on the local network participating in the unique conversation. The cross-platform API further provides the application with a message passing mechanism by which the application causes the first device to exchange messages related to the unique conversation with the entity.