How Do You Update...?

If you are making a flash website for someone who does not know how to use flash. How do they get the site updated?

You know, when they want to add a news file. It always says the name of the person who added it if the site is for, like, a band or something.

Is there a program for doing this easily or do they just tell you what they want done and you upload the site again.

Just very interested as I may start making websites for other people soon.