The preset you shared in a previous question indicated you're using a licensed copy. Licensed users can mount the live system and make changes (add/remove components), add drivers and tweak settings. Basically everything except work on ISO's, account creation, and disk layout, which make sense only on reinstalls.
This is the "Deployed images C:\Windows" (your live system) on the Source page.
Host Refresh is a more advanced feature to do live updates from a distribution without doing a full reinstall, which you can read up in previous forum threads.
Edit:
Don't forget to create a restore point in case you mess up something.