Design considerations for LBTI observer interface

We outline the design considerations and principles for developing a graphical user interface for configuring and operating Large Binocular Telescope Interferometer (LBTI) on sky, and examine the "weblication" methodology to deliver this astronomical software over the web. LBTI is an instrument to be installed at the Large Binocular Telescope to search for exo-planets. The instrument consists of a universal beam combiner to combine the light from both arms of the LBT, an L and M band science camera, a K band nulling channel along with wave front sensor units for adaptive optics correction. Additionally, the application will have an interface to the telescope control system and XML based telescope telemetry data flow.