This is a post by Emma Rudeck on the Concurrent Engineering Site.
PTC Creo Design Exploration Extension (Creo DEX) helps streamline the process for assessing new designs and deciding on changes to the designs without risking the original model.
IN SHORT, IT’S A SANDBOX FOR YOUR DESIGN, WHERE YOU CAN PLAY AROUND WITH YOUR MODELS, RISK-FREE, WITHOUT WORRYING ABOUT MESSING UP ANYTHING AND WITHOUT LOSING ANY INFORMATION.
You start by creating a snapshot of the session content. From this point on, any modification to the models can be safely reverted. Then you start changing and evolving your models and capture additional checkpoints along the design. You can instantly toggle back and forth between these checkpoints in a click of a button. The system replaces in session for you the different model iterations, as they were when you created that checkpoint.