We use a markup style system in a CMS. It works in a similar way to the system used for asking questions on stackoverflow (though it uses a different syntax).
I am curious if the text editing system used by stackoverflow (that I am typing into now) is a commercially available plug-in or if it was developed by the team.
What I really want to figure out how to do is add buttons for bold etc that manipulate the text inside the
textarea, but I am having trouble tracking down suitable information. The URL button seems the most complicated, as it will renumber all the references throughout your text if needed...