What is geoSHELL? geoSHELL is a user interface that is used exclusively with the GEOS operating system on a Commodore 64 or 128. Much like the DeskTop, geoSHELL can perform most of the functions that a GEOS user needs for managing disk files. Unlike the DeskTop, however, geoSHELL is almost entirely text-based, rather than using icons and pull-down menus. This does not mean that icons and menus cannot be used, however. Therefore, the initial appearance of geoSHELL leads one to believe that it is not user-friendly. However, once you become familiar with it, you will find yourself getting around in GEOS to be much faster and easier.