Design Edge uses 2D and 3D images, animations and computer-aided design (CAD) to create its interactive, multimedia Marsbook program that illustrates the interior and exterior of the proposed Initial Mars Habitat (IMH). IMH, which NASA says will be complete in the mid-21st century, is a human-controlled vessel that would survive a 50 million mile trip to Mars and support six people for 500 days in the Martian environment. NASA contracted for the presentation as a tool for building a full-size model and convincing Congress to finance the project. The presentation lets users walk through the IMH structure and test the movement of doors and furniture. Viewers can also call up information about different sections of the ship, look through CAD information and watch Apple QuickTime animated short films. The program's code was written on Mac IIsi machines and its models and textures were created on Quadras.