Use as Active Input

The Use as Active Input command on the Workbook Tree shortcut menu (accessible by right-clicking in the workbook tree area) toggles the use of the spreadsheet selected in the workbook tree as the input spreadsheet. If you want to use the selected spreadsheet as the input spreadsheet, select this command. If you do not want this spreadsheet to be the input spreadsheet, deselect this command. Although any number of stand-alone spreadsheets can be specified as input spreadsheets, only one spreadsheet per workbook can be designated as the input spreadsheet. The active input spreadsheet will be designated in the workbook tree with a red box.