Just a quick announcement...
We have noticed over the years, that the vast majority of 'abandoned' questions have come from anonymous, 'unregistered' users - they come along, post an incomplete question, and then never come back to answer the comments the rest of you have added, or indeed to accept or upvote an answer.
Because of this, we have asked the SE admins to disable 'unregistered' users from the site - hopefully this will result in fewer abandoned questions, and more responses to comments and flags.