Abstract: The improved building automation system of the present invention is modular in the extreme. This diminishes the amount of custom programming required in order to affect control of a particular building. It allows for a relatively open architecture which can accommodate a variety of unique control applications which are scripted for a particular building. By modularizing many of the common processes utilized in the automation system, the custom programming required to control any particular building is minimized. This modularity in design allows for uniform and coordinated control over a plurality of automation subsystems which may be incompatible with one another at the device or machine level, but which can be controlled utilizing a relatively small and uniform set of “interprocess control commands” which define an interprocess control protocol which is utilized in relatively high level scripts and control applications which may be written for a particular building.