The SAOtng graphical user interface consists of menus, accelerator buttons, the image window, the panner, and the colorbar. The menus provide much of the functional support in SAOtng: . ... The image display window is the heart of the SAOtng user interface. Images are displayed in this window. ... The Panner window provides a visual representation of the section of the image being displayed in the current frame, relative to the image (section) being maintained in SAOtng`s memory. ...