Is it possible to open more than one input data file simultaneously?
 

Yes. Moreover, user can simultaneously run different analyses on the same or different data files. To open (and use) more than one input data file simultaneously, open multiple data files and make sure each is specified as an input data file (by selecting Input Spreadsheet from the Data menu) as you start the respective analyses.

Analyses stay associated with the different data files when one switches between them (using the buttons next to the STATISTICA Start button, above the status bar). Note that user can also perform different analyses on the same or different data files.

While user can specify any number of spreadsheets as input data files, only one file (per workbook) can be designated as the active input data file.

This means that if all spreadsheets are opened within one workbook, only one of them can be used for input data at a time. The active input data spreadsheet is highlighted in the workbook tree with a red square, as shown above.