>>>When Automating Excel, my framework takes care of some details. The one I am concerned about right not is that it will re-use an existing Excel instance, instead of re-opening Excel.
>>>
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>>Time at time I need use openned Excel or re-open Excel.
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>I am not sure I understand. Do you mean you use both options - re-use Excel, and open another instance?

Yes,

MartinaJ

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>>Yes, If Excel hidden or hidden workbook, then automation faster, but you can disable calculation on Application or Workbook (properties Calculation,CalculationXXXXXXXX;) and after filling call method Calculate()
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>Interesting. I thought I only had a global option for recalculation. I'll have to check this.