Ever wondered how to create nice warnings, errors and notices in your own TYPO3 back-end modules and extensions? The way TYPO3 itself does this?

I'm working currently on a project, where I wanted to display a nice notice above the form when editing a content record. Now I could have done some hooking and marker overwriting.. but why not just use something that already exists? :-) If you have used 4.3.x already you've probably seen something similar around.