i agree with Mchael on this issue. The suggestion of hiding the input objects is exactly what i do not like in other programs such as Amapi and Hexagon. Then how can you reference one input object to many different ouput objects? If you want to see what is more interesting for history, take a look at SolidThinking. They have a full history tree, while the objects remain individually but also linked through the tree of all objects which used it as input...

jonah