Abstract : The Cherenkov Telescope Array (CTA) is a planned gamma-ray observatory. CTA will
incorporate about 100 imaging atmospheric Cherenkov telescopes (IACTs) at a Southern
site, and about 20 in the North. Previous IACT experiments have used up to five telescopes.
Subsequently, the design of a graphical user interface (GUI) for the operator of CTA
involves new challenges. We present a GUI prototype, the concept for which is being
developed in collaboration with experts from the field of Human-Computer Interaction (HCI).
The prototype is based on Web technology; it incorporates a Python web server,