Hello Tobin, Logic is almost certainly coded in C. They may (or may not) be moving the code into C++, which generally understands C code, but their code base is almost certainly not object-oriented. If they had object-oriented code, features such as multi-level undo & redo could be implemented relatively easily. However OO requires much stronger design skills than the mid-80's paradigm which is procedural C code. Cheers, Thomas