[Zigurd]

In some cases all the intelligence is behind the RESTful interface, and, so, that's what you could call "the app." In other cases, like synthesizing traffic and bus location data to predict when the bus will arrive, the "app" can be in the device, especially when there is no Web interface presenting the same synthesis. Games can be entirely in an endpoint device, as can any complex application that cannot depend on pervasive connectivity.

Needs more thought.