INFO function

=Info() can be used to get information about the location of the file, information about the OS, excel version, about the memory status etc....

Here are some examples:
=info("directory") Path of the current directory or folder.
=info("memavail") Amount of memory available, in bytes.
=info("memused") Amount of memory being used for data.
=info("numfile") Number of active worksheets in the open workbooks.
=info("origin") Absolute A1-style reference, as text, prepended with "$A:" for Lotus 1-2-3 release 3.x compatibility. Returns the cell reference of the top and leftmost cell visible in the window, based on the current scrolling position.
=info("osversion") Current operating system version, as text.
=info("recalc") Current recalculation mode; returns "Automatic" or "Manual".
=info("release") Version of Microsoft Excel, as text.
=info("system") Name of the operating environment:
=info("totmem") Total memory available, including memory already in use, in bytes.

Where Can it be used?
=info("directory") function can be used to get the path of the file in your reports.
=info("recalc") can be used to check whether the calculation status is 'Manual' or 'Automatic'.

Now there are other ways to get most of the above information, this formula is one more option that you have.