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Message: [QUOTE="Paul Herber, post: 5067753"] Just had another thought - I assume you are doing this whenever the document is opened. How about this, when the document has been opened and checked write a timestamp into the document user properties. Now in the future when the document is opened check the file's save timestamp and compare with the saved one. You'll have to make some allowance for the fact that it's going to take a while to write a document of 3000 shapes, but if the timestamp is within say 2 minutes then you can safely say that the document hasn't been changed since it was last checked. [/QUOTE]