2. External event handler. For example at detection of movement it is necessary to turn on highlighting. I.e. at occurrence of event to start the external program (with transmission to it of parameters of event).
3. The zone reacting to a common level of lighting. Generates event "low" at lowering a level of illuminance below threshold X and event "high" at exceeding a level of illuminance is higher than threshold Y. In a combination with item 2 will allow to control additional highlighting economically.
While will suffice.
