You can use ini files for anything you want, but they are especially useful for storing configuration data.
Fortunately, you don't need to worry about parsing ini files, because all the tools are available in LabVIEW in the "File I/O...configuration file VIs" palette.
To read a section+key, just specify the section and key, and you'll get the value using "read key.vi"..
I have attached a tiny VI that gets all section names, all keys under each section, then lists the value for each. Quite useful!