That's still not a good answer. My use of "sequel" or "S.Q.L" depends on many factors. For a non-technical crowd, or one that I otherwise know is unfamiliar with the topic, it's always S.Q.L. Similarly, If I'm throwing around many terms in a technical discussion, I will often use S.Q.L., that being the clearer form. I say "sequel" in the context of "let's take a look at this sequel here..."