I have splitted a very large and complex workbook in three seperate parts. To
navigate between the different workbooks I created a new workbook with four
buttons "Open file A", "Open file B", "Open file C" and "Exit" So far I
managed to ask the user if he wants to save the file he is leaving before
opening the other. E.g. User opens File A, makes some changes and selects
File B for opening. A little form asks him if he wants to save the changes he
made to File A. According to his answer File A is saved or not, and File B is
opened. So far so good. But now I want the little Save-Yes/No form only to
appear if he made changes to the File A. How do I determine whether he made
changes to the file or not?

Thanks in advance,

Henk