john24
What Paul post should do it, if not you can also try SendKeys "{F9}", or I can post you and example i've just made, it opens an excel file, let the user enter 2 numbers in two cells in the first sheet, then within the vb app you active the second sheet, enter a calcualte field and active the first sheet, it works, the calcualte field is update. But that's what you want?, or with Paul's reply is ok.
David.