TT Will run the argument list as an executable, using dbx, or dbxtool if the environmental variable DEBUG is set. TT will use dbxtool if DISPLAY is set, otherwise it will use dbx. TT will attempt to pick the correct size for dbxtools window. TT will assume that e plotting window will be used if GEO_X_0 is set. If DEBUG is not set it will give all but a small space at the bottom of the screen to the plotting window. If Both DEBUG and GEO_X_0 are set, TT puts the dbxtool & the plotting window side by side using the whole screen. TT modifies the .dbxinit file to control the size of dbxtool, and will try to clean up after itself, but it must have write permission in the directory.