By default, the ExcelLink package automatically connects, as needed, to an open instance of Excel. This provides easy, on-demand connectivity. In this mode, you can open or close Excel on your own whenever you wish.
If you write Mathematica code that automates Excel to perform a task, you may want the Mathematica code to initiate opening an instance of Excel. The ExcelInstall function provides a way of doing this.
This opens a visible instance of Excel, if one is not already open.
Once an Excel automation routine has been developed, you can set Visible -> False instead. This will open a hidden, private instance of Excel to perform the requested tasks.
