Next: Interfacing with the Gemini Data Handling System . ... The Gemini Telescopes Data Handling System (DHS) developed by the Canadian Astronomy Data Centre (CADC) has diverse requirements to support the operation of the Gemini telescopes. ... The servers use a client server model to communicate between themselves and with other Gemini software systems. This paper describes the client server model of the Gemini Data Handling System. ... The reasons for designing the DHS as separate servers are: . ...