What is the meaning of #XXX in code comments?

Question

I have seen this a lot in code, even vim marks it as a special case. #TODO and #FIXME are two other fix markers vim highlights but what does

Answer 1

Probably it's for cases that you don't know how to handle.
Check out this: List view of TODO/FIXME/XXX/HACK statements

alt text http://editra-plugins.googlecode.com/svn/wiki/images/commentbrowser/cb_screenshot.PNG