/R : RECORD MODE
Generate a response file.
In order to run an installation in silent mode, you must first run setup.exe with the /r option to generate a response file, which stores information about the data entered and options selected by the user at run time.
Running an installation program with the command setup.exe /r displays all the run-time dialog boxes, and stores the data in a file called setup.iss, created inside the system's windows folder. To specify an alternative response file name and location, use the /F1 option.