They appear at the top of each page and you can do some styling on them. You have the option of letting the users dismiss (close) them. You can set filters so you can have notices that are only visible to certain groups of users (e.g. only registered users, only members in a certain group, only users with a certain value in a custom field, etc.), or certain dates, or various other criteria, including combinations of criteria. It's a pretty flexible system in other words. I use it in my admin work to notify people about maintenance windows, changes, new features, that sort of thing.
hehehehe... actually, they can appear at more than the top of each page.
True enough. Kind of forgot about the Floating and Fixed options. I just always use Block or Scrolling because it's usually something I want noticed and top of page is best for that.
