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question

I am creating a native application under OSX and have some problems that I
did not have under OS9.
1. Why can't I update the display or drawing on a window as I have it
displayed while doing a long calculation?
2. How do I update the progress bar as I do a long calculation?
3. How do I create a separate thread for doing this kind of long processes
with a cancel button?
thanks in advanced.
Henry
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