Disparate control systems may be connected using state of the art Microsoft compatible tools. Using these tools provides avenues to expand direct digital control systems using BACnet, Lonworks or a variety of other protocols and programming means. Multi system integration engineering is available to connect multiple control systems, allow interoperability and reduce programming and expansion costs, reusing existing control hardware and networks. True vendor independence can be achieved through the use of cost effective Graphic User Interface tools and Microsoft integration products.