Auto Complete

What is auto complete?

To make things easier for you, each time you type something into a form, and type a password, Internet Explorer remembers them, when you go back to that form later on, it auto completes the entry, or gives you a list to choose from.  This is also responsible for the address bar history!

Good or bad?

Well, it's not appropriate on a system where more than one person has access, they could enter your private accounts via password remembering.   Also if you search for something (most common question), everyone else can see what you chose to search for!

Clearing the stored contents

From within Internet Explorer,  Tools>>Internet Options, select the content tab, then click "Auto Complete..."  Click Clear Passwords, then click Clear Forms.  This also clears the address bar.

Disabling Auto Complete

You can turn off auto complete or parts of it, good if you want your search engine queries saved but your passwords kept secure!
Web Addresses: When enabled, this stores a list of web addresses in the IE address bar, so you don't have to type full addresses.
Forms: Stores information on forms within HTML forms, where you enter data to submit to a script.
Usernames and passwords: Stores your usernames and passwords!  - If you use this, remember what I said above.

To disable a part, remove the check, to enable a part, place a check by it.  To disable it altogether, remove all the checks.
Note: Disabling Auto Complete does not clear the information it previously stored.