Windows 95 or Windows NT is required for this program. To play the Mars.fly animation, first run 3dem.exe. Then choose "FlyBy - Open Flyby" from the menu and select the "Mars.fly" file to open and play the flyby animation of crater Lohse. To replay the animation, choose "Flyby - Play Flyby" from the menu. You can create your own flyby animations of Mars with 3dem.exe. See the instructions contained in "readme.txt." Send any questions or comments to rshorne@delphi.com or rshorne@mnsinc.com.