fullscreen --Command, no inputs. Abbreviation: full
     This command applies only to the Atari display turtle. It eliminates
     the use of the bottom four lines of the screen to display the commands
     you type; instead, the entire screen is available to show the picture
     drawn by the turtle. However, you can no longer see what you're
     typing. The command may be used after the picture is already drawn;
     the part "hidden" by the text at the bottom of the screen will become
     visible. On other displays, fullscreen and splitscreen are
     equivalent; they make the entire screen available for graphics, and
     text appears on the bottom line (Gigis) or superimposed (ADMs), or
     somewhere.