'Most 3d programs don`t have an undo because it could at times use a huge amount of memory to store the undo steps' Let's get this right, folks. 3d max has an undo. It's default is 20 steps, but you can set it to anything you want. AFAIK, almost every 3d program EXCEPT poser has a multiple undo. Poser has a single undo, and it doesn't always work the way you think it will. F'rinstance, if you pose a figure then move the camera, poser will sometimes undo both. Other times it only undoes the camera movement. Best solution for TOTAL security. Save TWO copies of important scenes and alternate the saves between them, every 5 - 10 minutes, depending on how much your doing and how important it is. mac