You're not going to find anything on rcu about it, it's a feature of the browser itself.

If you're using Internet Explorer, in the menu bar, click on Tools, then Internet Options. Click on the Content tab, then click on the AutoComplete button. When that window pops up, click on Clear Passwords. You should also check the box next to the "Prompt me to save passwords" option, then you can decide for a particular site whether or not you want the password saved.

For Firefox or Netscape, click on Tools in the menu bar, then Options. Select the Privacy icon near the top of the window, then click on the Passwords tab. Find the "View Saved Passwords" button and click on it. It brings up a list of all the websites for which the browser has saved a username/password combination, and you can delete them individually.