Graphical User Interface. This is a system where the user will use something other than a terminal screen to interact with a device. In the case of computers, and smartphones – this is pretty much expected. With some devices that would connect to a network such as a NAS? or SIP? phone, this will likely be web pages where one will enter the typed information on the pages, and select Apply or Submit. While not drag and drop, there will be an interaction that is not terminal.