Hello, they are nothing else this:
How does it work?
The "Simple Twitter Status Updates" WordPress plugin automatically publishes a status on your twitter account when a new post has been published, modified or commented by an user.
Keep your followers up-to-date with what happens on your blog!
Visit http://www.bannerweb.ch for further information to give us a feedback or to get support!
Twitter authentication (oAuth)
How I should do "Twitter authentication"?