Use the Arguments dialog box to pass the command-line arguments to the designated executable or script when the assigned action occurs. When the program or script is executed, the string you provide is passed exactly as you have it, except the fields are replaced with their actual values. This further qualifies the unique action being performed and enables you to be very precise with what you're passing on during a process.
To insert your arguments, just paste or type the text into the dialog. You can also insert fields as arguments, which you can easily assign. For example, if you're running a Javascript and it needs some values provided during the routine, the values would be pulled from the Arguments dialog.