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InvalRect   function

ignored = fn InvalRect(rect)

Before Carbon became a part of the Mac toolbox, we were able to use a toolbox procedure called InvalRect to mark a portion of the current window as an area that needed to be refreshed during the next update. This call will not work in MacOS X (or in the Carbon version of OS 9). Our substitute, fn InvalRect, will work in versions 7 through X without additional coding required on your part.