Costa GUI (ver 1.8.0) Freeware The Costa GUI is a Shell that runs on top of DOS (like GEOS does). It is a current OpenSource Graphical User Interface that includes its own mouse driver. The URL = https://github.com/jacobpalm/costa Costa is started with the file "COSTA.BAT", which contains all the neccessary paths and whatnot for Costa. The first time you start Costa (or any time your change the program directory), you should run "SETUP.EXE", which will re-configure COSTA.BAT appropriately. TIP: Point the TEMP environment to a RAM drive.