A constellation is determined in reference to a particular combination of devices and/or software, some or all of which may be coupled with a network. A constellation addresses aggregate capabilities provided by a combination of devices and/or software available on the network. The network may define multiple constellations. Services are written for constellations, and the services may be pulled from external sources for use on the network. A server on the network, such as a service host, may coordinate and manage obtaining services from the external sources, and removing or disabling services for constellations no longer valid.