This is a shoutbox widget that you can add in any of the available widget positions.
Options:

1. Shoutbox refresh interval - Allows you to set refresh interval for new messages. This option can be disabled.
2. Maximum shout length - Set the maximum allows shout length.
3. Shout display limit - Set the maximum number of shouts to display on page load.
4. Delete shouts older than - Allows you to auto-delete shouts older than x days.
5. Enable sound - Enable sound notification for new shouts.
6. Enable avatars - Display user avatar in shout.
7. Allow BB codes - Controlls if BB codes are parsed or not.
8. Footer - Allows you to add custom data (ads, notices, etc) in the shoutbox footer.

It has user group permissions for using shoutbox, editing/deleting shouts, prune shoutbox (/prune)
When scrolling at the bottom of the shouts, older shouts will be automatically loaded.