Running the calculator from LV is easy by using the System Exec VI. Of course, you will then have it as a seperate window.
As far as I know, there is no ActiveX container for the calculator, but you might be able to find one which will let you put "anything" into it and then use that one to run the calculator.
Another option would be to run the calculator application and then embed its window into your FP window. If you search the forums for "MDI" you should find some examples on how to do this.
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