Pop up screen when tab is selected

Anyone know how to get a pop up screen to appear when a tab is selected. One of those screens that have message and the user has to press okay to use the tab.

Thanks

Hi, if you put this in a "Workbook activate" Event. The Message Box will appear in every sheet you open, and tell you what the sheet name is.

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Regards Mick

I only need the pop up screen in one sheet tell the user how to use the sheet.

Is that possible?

Thanks,