jwbear, Absolutly right on the undo code. A well written application can have the undo retrofitted easily, Poser, with so many different parts that don't work together would be more difficult. That said. There is currently a single level undo in P5 in many places. using a memory or temp file buffer at those places to do multiple undos should be easy to code, unless each undo step is embedded code within the program structure. I hope the P5 internal structure doesn't use this type of coding, although all eveidence points to it.