Ability to update the data of the worksheet of a chart in slideshow mode, without seeing the Excel worksheet opening or flashing.
We build software for displaying real-time data like a KPI on a slideshow.
With that information screen running (the slideshow) you always see the Excel worksheet flashing (by the .Activate call).
The old MS Graph had that functionality. With that, we could update the data quickly without seeing something disturbing on top of the slideshow. Now with the newer Charting capabilities, this seems not to be possible without flashing or chart corruptions (E_Fail when opening afterwards).