Controlled devices according to a device control model maintain a state
table representative of their operational state. Devices providing a user
control point interface for the controlled device obtain the state table
of the controlled device, and may also obtain presentation data defining
a remoted user interface of the controlled device and device control
protocol data defining commands and data messaging protocol to effect
control of the controlled device. These user control devices also
subscribe to notifications of state table changes, which are distributed
from the controlled device according to an eventing model. Accordingly,
upon any change to the controlled device's operational state, the
eventing model synchronizes the device's state as represented in the
state table across all user control devices.