The Detector Memory System has a mouse driven user interface which provides the user with some data assessment facilities. The mouse has three buttons and is moved around on a reflecting pad. The mouse drives a cursor on the screen which is in the form of a cross. The cursor can be moved anywhere on the screen. The screen consists of an image display area and a menu area; the menu area appears in the top right hand corner of the screen. When CCD data is displayed there are also one or more ``icons'', small CCD images, these enable the user to switch between CCD buffers displayed in the main display area.