As stated, I asked a question over 5 years ago that was closed due to "Needs to be more focused". Now, the irony is that I was recently in a Half Priced Bookstore, and found the book I was asking about. As I was purchasing it, I was telling the person that I'd asked on here YEARS ago about it. Now that I've found it, I was wondering the rules on posting an update. For reference, here's the book:
You should post a comment on the question that you've discovered the answer, and flag the question to be reopened. Once the question is reopened, you can answer it and accept your answer.
Note that "needs focus" and "needs clarity" are frequently judgment calls anyway, and the community in general is open to revisiting these statuses if the circumstances change.